Weekly Astro Fluids Discussion

The weekly astrophysical fluids discussion group meets on Thursdays at 11:10 in Rm. 1318A to discuss recent hydrodynamic and MHD papers of astrophysical interest. Everyone is welcome, and is invited to suggest papers for discussion.

Papers discussed in the past are listed here; for the current week's discussion list, see this page.

Thu, Mar 19 2009

• “The Emergence of a Twisted Flux Tube into the Solar Atmosphere: Sunspot Rotations and the Formation of a Coronal Flux Rope ” by Fan, arXiv:0903.1288;
• “Heating Cluster Gas” by King, arXiv:0903.1516;
• “The role of magnetic fields in star formation” by Salmeron, arXiv:0903.1673; and
• “Collapse and Fragmentation of Molecular Cloud Cores. X. Magnetic Braking of Prolate and Oblate Cores” by Boss, arXiv:0903.1810.

Thu, Mar 4 2009

• “Evolution of X-ray cavities” by Brüggen, Scannapieco& Heinz, arXiv:0902.4242;
• “Viscous damping of variability of disc mass flow rate in binaries” by Kawabata, Zdziarski & Mineshige, arXiv:0902.4530; and
• “Effects of Magnetic Braking and Tidal Friction on Hot Jupiters” by Barker & Ogilvie, arXiv:0902.4554.

Thu, Feb 19 2009

• “Dual black holes in merger remnants. I: linking accretion to dynamics” by Dotti et al., arXiv:0902.1525;
• “Radio polarimetry signatures of strong magnetic turbulence in Supernova Remnants” by Stroman & Pohl, arXiv:0902.1701;
• “Radio Emission from Supernova Remnants: Implications for Post-Shock Magnetic Field Amplification and the Magnetic Fields of Galaxies” by Thompson, Quataert & Murray, arXiv:0902.1755; and
• “Two-Fluid MHD Simulations of Relativistic Magnetic Reconnection” by Zenitani, Hesse, & Klimas, arXiv:0902.2074.

Thu, Feb 12 2009

• “On the Saturation of the Magnetorotational Instability via Parasitic Modes” by Pessah & Goodman, arXiv:0902.0794;
• “The Saturation Limit of the Magnetorotational Instability” by Vishniac, arXiv:0902.0942;
• “Growth of the MRI in Accretion Discs -- the Influence of Radiation Transport” by Flaig, Kissman & Kley, arXiv:0901.4029; and
• “MRI channel flows and their parasites” by Latter, Lesaffre, & Balbus, arXiv:0901.4712.

Thu, Feb 5 2009

• “Magnetic pinch-type instability in stellar radiative zones” by Ruediger, Kitchatinov, & Gellert, arXiv:0901.0767;
• “Double-diffusive instabilities of a shear-generated magnetic layer” by Silvers et al., arXiv:0901.2388;
• “Conical Winds from the Disk-Magnetosphere Boundary” by Romanova et al., arXiv:0901.4265; and
• “Buoyancy Instabilities in Galaxy Clusters: Convection Due to Adiabatic Cosmic Rays and Anisotropic Thermal Conduction” by Sharma et al., arXiv:0901.4786.

Thu, Jan 15 2009

• “GRB Light Curves in the Relativistic Turbulence Mode” by Lazar, Nakar, & Piran, arXiv:0901.1133;
• “Thermal Tides in Short Period Exoplanet” by Arras & Socrates, arXiv:0901.0735;
• “Turbulence and Magnetic Field Amplification in Supernova Remnants: Interactions Between A Strong Shock Wave and Multi-Phase Interstellar Medium” by Inoue, Yamazaki & Inutsuka, arXiv:0901.0486; and
• “On the Physical Interpretation of Malyshkin's (2008) Model of Resistive Hall-MHD Reconnection” by Uzdensky, arXiv:0901.0520.

Thu, Nov 20 2008

• “Semi-global simulations of the magneto-rotational instability in core collapse supernovae” by Obergaulinger et al., arXiv:0811.1652;
• “Magnetic field amplification by SN-driven interstellar turbulence” by Gressel, Ziegler, & Elstner, arXiv:0811.0542;
• “Global Slim Accretion Disk Solutions Revisited” by Jiao et al., arXiv:0811.2451;
• “The rotation rate of the solar radiative zone” by Garaud & Guervilly, arXiv:0811.2550; and
• “Episodic Magnetic Bubbles and Jets: Astrophysical Implications from Laboratory Experiments” by Ciardi et al. arXiv:0811.2736.

Thu, Nov 13 2008

• “Dynamical Simulations of Magnetically Channeled Line-Driven Stellar Winds: III. Angular Momentum Loss and Rotational Spindown” by ud-Doula, Owocki, & Townsend, arXiv:0810.4247;
• “The Angular Momentum of the Solar Wind” by Weber & Davis, 1967 ApJ 148:217; and
• “Accretion-powered Stellar Winds. II. Numerical Solutions for Stellar Wind Torques” by Matt & Pudritz, 2008 ApJ 678:1109.

Thu, Nov 6 2008

• “Analog of Astrophysical Magnetorotational Instability in a Couette-Taylor Flow of Polymer Fluids” by Boldyrev, Huynh, & Pariev, arXiv:0810.5073;
• “Direct Calculation of the Turbulent Dissipation Efficiency in Anelastic Convection” by Penev, Barranco, & Sasselov, arXiv:0810.5370;
• “Stellar, Brown Dwarf, and Multiple Star Properties from Hydrodynamical Simulations of Star Cluster Formation” by Bate, arXiv:0811.0163; and
• “Full Numerical Simulations of Catastrophic Small Body Collisions” by Leinhardt & Stewart, arXiv:0811.0175.

Thu, Oct 30 2008

• “Large scale galactic turbulence: can self-gravity drive the observed HI velocity dispersions?” by Agertz et al., arXiv:0810.1741;
• “Formation of protostellar jets as two-component outflows from star-disk magnetospheres” by Fendt, arXiv:0810.4154;
• “Dynamical Simulations of Magnetically Channeled Line-Driven Stellar Winds: III. Angular Momentum Loss and Rotational Spindown” by ud-Doula, Owocki, & Townsend, arXiv:0810.4247; and
• “Turbulence in Wind-Blown Bubbles around Massive Stars” by Dwarkadas, arXiv:0810.4361.

Thu, Oct 23 2008

• “Neutron-Rich Freeze-Out in Viscously Spreading Accretion Disks Formed from Compact Object Mergers” by Metzger, Piro, & Quataert, arXiv:0810.2535;
• “Thermal Effects of Circumplanetary Disk Formation around Proto-Gas Giant Planets” by Machida, arXiv:0810.2584;
• “Standing on the shoulders of giants: Trojan Earths and vortex trapping in low mass self-gravitating protoplanetary disks of gas and solids” by Lyra et al., arXiv:0810.3192; and
• “Axisymmetric magnetic fields in stars: relative strengths of poloidal and toroidal components” by Braithwaite, arXiv:0810.1049.

Thu, Oct 16 2008

• “Numerical study of large-scale vorticity generation in shear-flow turbulence” by Käpylä, Mitra, & Brandenburg, arXiv:0810.0833;
• “Is the Scaling of Supersonic Turbulence Universal?” by Schmidt, Federrath, & Klessen, arXiv:0810.1397;
• “Large-scale Dynamo Action Driven by Velocity Shear and Rotating Convection” by Hughes & Proctor, arXiv:0810.1586; and
• “The properties of brown dwarfs and low-mass hydrogen-burning stars formed by disc fragmentation” by Stamatellos & Whitworth, arXiv:0810.1687.

Thu, Oct 9 2008

• “Vortices in self-gravitating disks” by Mamatsashvili & Rice, arXiv:0809.5220;
• “Absolute versus convective helical magnetorotational instability in a Taylor-Couette flow” by Pride & Gerbeth, arXiv:0810.0386;
• “Dust Settling in Magnetorotationally-Driven Turbulent Discs I: Numerical Methods +and Evidence for a Vigorous Streaming Instability” by Balsara et al., arXiv:0810.0246;
• “The large-scale shock in the cluster of galaxies Hydra A” by Simionescu et al., arXiv:0810.0271; and
• “Formation of Jets and Equatorial Superrotation on Jupiter” by Schneider & Liu, arXiv:0809.4302.

Thu, Oct 2 2008

• “Magnetic Braking and Protostellar Disk Formation: Ambipolar Diffusion” by Mellon & Li, arXiv:0809.3593;
• “ The Growth & Migration of Jovian Planets in Evolving Protostellar Disks with Dead Zones” by Matsumura, Pudritz, & Thommes, arXiv:0809.3749;
• “Localized magnetorotational instability and its role in the accretion disc dynamo” by Lesure & Ogilvie, arXiv:0809.3871; and
• “Convectively driven vortex flows in the Sun” by Bonet et al., arXiv:0809.3885.

Thu, Sept 11 2008

• “Rapidly Rotating Suns and Active Nests of Convection” by Brown, Browning, et al, arXiv:0808.1716;
• “High accretion rates in magnetised Keplerian discs mediated by a Parker instability driven dynamo” by Johansen & Levin, arXiv:0808.3579;
• “Turbulence-driven Polar Winds from T Tauri Stars Energized by Magnetospheric Accretion” by Cranmer, arXiv:0808.2250; and
• “The effect of stellar winds on the formation of a protocluster” by Dale & Bonnell, arXiv:0808.1510.

Thu, Jul 10 2008

• “Binary formation and mass function variations in fragmenting discs with short cooling times” by Alexander, Armitage, & Cuadra, arXiv:0807.1731;
• “The role of cross helicity in magnetohydrodynamic turbulence” by Perez & Boldyrev, arXiv:0807.2635;
• “On Self-Sustained Dynamo Cycles in Accretion Discs” by Lesur & Ogilvie, arXiv:0807.1703; and
• “Accretion and destruction of planetesimals in turbulent disks” by Ida, Guillot, & Morbidelli, arXiv:0807.1761.

Thu, Jul 3, 2008

• “Migration of Protoplanets in Radiative Disks” by Kley & Creda, arXiv:0806.2990;
• “Planet Migration and Disk Destruction due to Magneto-Centrifugal Stellar Winds” by Lovelace, Romanova, & Barnard, arXiv:0806.4197;
• “Non-axisymmetric instability of axisymmetric magnetic fields” by Bonnano & Urpin, arXiv:0806.4727; and
• “The Temperature of Interstellar Clouds from Turbulent Heating” by Pan & Padoan, arXiv:0806.4970.

Thu, Jun 26, 2008

• “The evaporation of spherical clouds in a hot gas. I - Classical and saturated mass loss rates” by Cowie & McKee, (1977) ApJ 211:135,
• “Interstellar Bubbles. II - Structure and Evolution” by Weaver et al., (1977) ApJ 218:377,
• “The evaporation of spherical clouds in a hot gas. III - Suprathermal evaporation” by Balbus & McKee, (1982), ApJ, 252:529,
• “Global effects of thermal conduction on two-phase media” by McKee & Begelman, (1990) ApJ 358:375, and
• “Thermal Conduction in a Tangled Magnetic Field” by Chandran & Cowley, (1998) Phys Rev Let 80:3077.

Thu, Jun 19, 2008

• “The Challenge of Sub-Keplerian Rotation for Disk Winds” by Shu et al., arXiv:0806.2137;
• “Ram pressure stripping in a viscous intracluster medium” by Roediger & Brueggen, arXiv:0806.1406;
• “Analytical theory of forced rotating sheared turbulence. II. Parallel case” by Leprovost & Kim, arXiv:0806.2132;
• “Differential rotation in giant planets maintained by density-stratified turbulent convection” by Jianghui, Shangli, & Lin, arXiv:0806.2002; and if there's time,
• “Regulation of thermal conductivity in hot galaxy clusters by MHD turbulence” by Balbus & Reynolds, arXiv:0806.0940 and
• “3-d resistive MHD simulations of magnetic reconnection and the tearing mode instability in current sheets” by Parrish, Stone & Lemaster, arXiv:0806.2148.

Thu, Jun 12, 2008

• “Thermal Instability” by Field, (1965) ApJ 142:531, and
• “Thermal Instability” by Balbus, (1995), The Physics of the Interstellar Medium.

Thu, Jun 5, 2008

• “The dependence of the helicity bound of force-free magnetic fields on boundary conditions” by Zhang & Flyer, arXiv:0805.1783;
• “Bypassing Cowling's theorem in axisymmetric fluid dynamos” by Gissinger, Dormy, & Fauve, arXiv:0805.2123;
• “Baroclinic Generation of Potential Vorticity in an Embedded Planet-Disk System” by Jianghui, Shangli, & Lin, arXiv:0805.3009; and
• “3-d resistive MHD simulations of magnetic reconnection and the tearing mode instability in current sheets” by Murphy, Ouyed, & Pelletier, arXiv:0806.0144.

Thu, May 15, 2008

• “Aspect ratio dependence in magnetorotational instability shearing box simulations” by Bodo et al., arXiv:0805.1172;
• “Fragmentation of Shocked Flows: Gravity, Turbulence and Cooling” by Heitsch, Hartmann & Burkert, arXiv:0805.0801;
• “Fast dynamos in weakly ionized gases” by Zweibel & Heitsch, arXiv:0805.0412,
• “Strongly compressible current sheets under gravitation” by Vainshtein, arXiv:0804.3789; and
• “Self-Feeding Turbulent Magnetic Reconnection on Macroscopic Scales” by Lapenta, arXiv:0805.0426.

Thu, May 8, 2008

• “X-winds - Theory and Observations” by Shu et al., PPIV proceedings,
• “Magnetocentrifugally driven flows from young stars and disks. I: A generaliezd model” by Shu et al., (1994) ApJ 429:781, and
• “Magnetocentrifugally driven flows from young stars and disks. IV: The Accretion Funnel and Dead Zone” by Ostriker & Shu, (1995) ApJ 447:813.

Thu, May 1, 2008

• “Theory of magnetically powered jets” by Spruit, arXiv:0804.3096.

Thu, Apr 24, 2008

• “The role of Kelvin-Helmholtz instability in dusty and partially ionized outflows” by Shadmehri & Downes, arXiv:0804.2615;
• “3D simulations of RS Oph: from accretion to nova blast” by Walder, Folini & Shore, arXiv:0804.2628;
• “Dead Zone Accretion Flows in Protostellar Disks” by Turner & Sato, arXiv:0804.2916; and
• “Theory of magnetically powered jets” by Spruit, arXiv:0804.3096; and
• “Gravitational Instability in Radiation Pressure Dominated Backgrounds” by Thompson, arXiv:0804.3403.

Thu, Apr 17, 2008

Thu, Apr 10, 2008

• “The Warped Disc of NGC4258” by Martin & Lester, arXiv:0804.1013,
• “Galactic Spiral Shocks with Thermal Instability” by Kim, Kim, & Ostriker, arXiv:0804.0139,
• “Accretion discs, low-mass protostars and planets: probing the impact of magnetic +fields on stellar formation” by Donati et al., arXiv:0804.0683; and
• “Interaction of Close-in Planets with the Magnetosphere of their Host Stars I: Diffusion, Ohmic Dissipation of Time Dependent Field, Planetary Inflation, and Mass Loss” by Laine, Lin, & Dong, arXiv:0804.0975.

Thu, Apr 3, 2008

• “On the Enhancement of Mass Loss in Cepheids Due to Radial Pulsation” by Neilson & Lester, arXiv:0803.4198,
• “Dense planetary rings and the viscous overstability” by Latter & Ogilvie, arXiv:0803.4123,
• “The star formation efficiency and its relation to variations in the initial mass function” by Clark, Bonnell, & Klessen, arXiv:0803.4053, ; and
• “On the Constancy of the Characteristic Mass of Young Stars” by Elmegreen, Klessen, & Wilson, arXiv:0803.4411.

Thu, Mar 20, 2008

• “On non-axisymmetric magnetic equilibria in stars” by Braithwaite, arXiv:0803.1661,
• “The effect of turbulent intermittency on the deflagration to detonation transition in SN Ia explosions” by Pan, Wheeler, & Scalo, arXiv:0803.1689,
• “Radial and Nonradial Oscillation Modes in Rapidly Rotating Stars” by Lovekin & Dupree, arXiv:0803.2053, ; and
• “The First Galaxies: Assembly, Cooling and the Onset of Turbulence” by Greif et al., arXiv:0803.2237.

Thu, Mar 13, 2008

• “Mini-conference on angular momentum transport in laboratory and nature” by Ji et al., arXiv:0803.1009,
• “The role of the Rayleigh-Taylor instability in ram pressure stripped disk galaxies” by Roediger & Hensler, arXiv:0803.1047, ; and
• “Statistical Description of a Magnetized Corona above a Turbulent Accretion Disk” by Udensky & Goodman, arXiv:0803.0337.

Thu, Mar 6, 2008

• “Three-dimensional stability of magnetically confined mountains on accreting neutron stars” by Vigelius, & Metalos, arXiv:0802.3238,
• “The Magnetohydrodynamics of Shock-Cloud Interaction in Three Dimensions” by Shin, Stone, & Snyder, arXiv:0802.2708,
• “Turbulent transport and its effect on the dead zone in protoplanetary discs” by Ilger & Nelson, arXiv:0802.4409; and, as a classic paper,
• “Accretion by rotating magnetic neutron stars. II - Radial and vertical structure of the transition zone in disk accretion” by Ghosh & Lamb (1979), ApJ 232:259.

Thu, Feb 28, 2008

This week is the Ontario Star Formation Jamboree.

Thu, Feb 21, 2008

• “Nonlinear Saturation of g-modes in Proto-Neutron Stars: Quieting the Acoustic Engine” by Weinberg, & Quataert, arXiv:0802.1522,
• “Thermo-Rotational Instability in Plasma Disks Around Compact Objects” by Coppi, arXiv:0802.1694,
• “Accretion to Magnetized Stars through the Rayleigh-Taylor Instability: Global Three-Dimensional Simulations” by Kulkarni & Romanova, arXiv:0802.1759,
• “Magnetically Aligned Velocity Anisotropy in the Taurus Molecular Cloud” by Heyer et al., arXiv:0802.2084; and
• “The effect of the dynamical state of clusters on gas expulsion and infant mortality” by Goodwin, arXiv:0802.2207.

Thu, Feb 14, 2008

• “Three-dimensional simulations of rotationally-induced line variability...” by Kurosawa, Romanova, & Harries, arXiv:0802.0201,
• “On the evolution of cooling cores in X-ray galaxy clusters” by Ettori & Brighenti, arXiv:0802.0263,
• “Global axisymmetric Magnetorotational Instability with density gradients” by Pino & Mahajan, arXiv:0802.0274; and
• “Massive Star Forming Regions: Turbulent Support or Global Collapse?” by Vazquez-Semadeni et al., arXiv:0802.1291.

Thu, Jan 31, 2008

• “Simulations of cosmic ray feedback by AGN in galaxy clusters” by Sijacki, Pfrommer, et al., arXiv:0801.3285,
• “The effect of magnetic fields on star cluster formation” by Price & Bate, arXiv:0801.3293,
• “Angular Momentum Accretion onto a Gas Giant Planet” by Machida et al., arXiv:0801.3305,
• “Kinematics of solid particles in a turbulent protoplanetary disc” by Carballido, Stone, & Turner, arXiv:0801.3646; and
• “The Destruction of Cosmological Minihalos by Primordial Supernovae” by Whalen et al., arXiv:0801.3698.

Thu, Jan 24, 2008

Thu, Jan 17, 2008

• We'll discuss the classic paper “Parasitic instabilities in magnetized, differentially rotating disks”, Goodman & Xu (1994), ApJ 432:213,
• and the contemporary papers “Convection during the Late Stages of Simmering in Type Ia Supernovae” by Piro & Chang, arXiv:0801.1321; and
• “Magnetic shear-driven instability and turbulent mixing in magnetized protostellar disks” by Bonanno & Urpin arXiv:0801.1960.

Thu, Jan 10, 2008

• “Jupiter and Super-Earth embedded in a gaseous disc” Podlewska & Szuszkiewicz, arXiv:0712.3250,
• “Hydrodynamical activity in thin accretion disks” Regev, arXiv:0801.0699,
• “Long-term Nonlinear Behaviour of the Magnetorotational Instability in a Localised Model of an Accretion Disc” by Silvers, arXiv:0712.4343; and
• “A Minimum Column Density of 1 g cm^-2 for Massive Star Formation” by Krumholz & McKee arXiv:0801.0442.

Thu, Dec 13, 2007

Nicole Wityk from Calgary talked to us about “Probing the Galaxy with Superbubbles: 3D Simulations”. Then we discussed:

• “Magnetohydrodynamic Simulations of Disk Galaxy Formation: the Magnetization of The Cold and Warm Medium” Wang & Abel, arXiv:0712.0872,
• “Dust evolution in protoplanetary disks” by Gonzalez et al., arXiv:0712.0766; and
• “Embedded, Accreting Disks in Massive Star Formation” by Kratter, Matzner, & Krumholz, arXiv:0712.0853.

Thu, Dec 6, 2007

• “Galactic Dynamos and Galactic Winds” Beck, arXiv:0711.4700,
• and for a classic paper, we will discuss “Circulation and turbulence in rotating stars”, Knobloch & Spruit (1986), A&A 166:359.
• “Vertical Shearing Instabilities in Radially Shearing Disks: The Dustiest Layers of the Protoplanetary Nebula” by Chiang, arXiv:0711.4349,
• “Three-Dimensional Simulations of Kelvin-Helmholtz Instability in Settled Dust Layers in Protoplanetary Disks” by Barranco, arXiv:0711.4410;

Thu, Nov 29, 2007

• “Magnetorotational instability in electrically driven fluids” Khalzov, Smolyakov, & Ilgisonis, arXiv:0711.2818,
• “Interacting Jets from Binary Protostars” by Murphy et al., arXiv:0711.3144,
• “Origin of neutron star magnetic fields” by Spruit, arXiv:0711.3650;
• and for a classic paper, we will discuss “Circulation and turbulence in rotating stars”, Zahn (1992), A&A 26:265.

Thu, Nov 22, 2007

• “Nuclear burning and mixing in the first stars: entrainment at a convective boundary using the PPB advection scheme” by Woodword et al., arXiv:0711.2091,
• “f-mode interactions with thin flux tubes: the scattering matrix” by Hanasoge et al., arXiv:0711.2076,
• “Simulating Anisotropic Thermal Conduction in Supernova Remnants, Implications for the Interstellar Medium” by Balsara et al., arXiv:0711.2295,
• “On the existence of a reverse shock in magnetized GRB ejecta” by Giannios, Mimica, & Aloy, arXiv:0711.1980; and
• “Building Giant-Planet Cores at a Planet Trap” by Morbidelli et al., arXiv:0711.2344.

Thu, Nov 15, 2007

• Elizabeth Harper-Clark led discussion of the classic paper Weaver et al. 1977, “Interstellar bubbles. II - Structure and evolution” ApJ 218:377,
• For contemporary papers we discussed “Unstable Disk Accretion to Magnetized Stars: First Global 3D MHD Simulations” by Romanova, Kulkarni, & Lovelace, arXiv:0711.0418,
• “On the viability of the shearing box approximation for numerical studies of MHD turbulence in accretion disks” by Regev & Umurhan, arXiv:0711.0794; and
• “ Magnetic field amplification in proto-neutron stars -- The role of the neutron-finger instability for dynamo excitation” by Naso et al., arXiv:0711.1498.

Thu, Nov 1, 2007

• “Stability of magnetic configurations containing the toroidal and axial fields” by Bonanno & Urpin, arXiv:0710.4588,
• “Generation of Magnetic Field by Combined Action of Turbulence and Shear” by Yousef et al., arXiv:0710.3359,
• “Three-Dimensional Simulations of a Starburst-Driven Galactic Wind” by Cooper et al., arXiv:0710.5437; and
• “Magnetic diffusivity tensor and dynamo effects in rotating and shearing turbulence” by Brandenburg et al., arXiv:0710.4059.

Thu, Oct 11, 2007

• The classic paper, “The acceleration of cosmic rays in shock fronts. I” by Bell (1978), MNRAS 182:147,
• “Fractal Density Distribution of Interstellar Clouds from Numerical Simulations of Compressively Driven Supersonic Turbulence” by Federrath, Schmidt, & Klessen, arXiv:0710.1359,
• “Instabilities of Spiral Shocks -- II. A quasi-steady State in the multi-phase inhomogeneous ISM” by Wada, arXiv:0710.0407,
• “Alfvén QPOs in Magnetars” by Sotani, Kokkotas, & Stergioulas, arXiv:0710.1113; and
• “Resonance Related Spiral Substructure in a Galactic Gaseous Disk” by Yáñez et al., arXiv:0710.1331.

Thu, Oct 4, 2007

• The classic paper, “Formation Scenario for Wide and Close Binary Systems” by Blandford & Ostriker (1978), ApJ 221:L29,
• “The Influence of Magnetic Field Geometry on the Evolution of Black Hole Accretion Flows: Similar Disks, Drastically Different Jets” by Beckwith, Hawley, & Krowlik, arXiv:0709.3833,
• “Transverse stability of relativistic two-component jets” by Meliana & Keppens, arXiv:0709.3838,
• “On the star formation rate and turbulent dissipation in galactic models” by Kurbatov, arXiv:0709.3923; and
• “Coexisting stochastic and coherence resonance in a mean-field dynamo model for Earth's magnetic field reversals” by Fischer, Stefani, & Gerbeth, arXiv:0709.3932.

Thu, Sep 27, 2007

• “Formation Scenario for Wide and Close Binary Systems” by Machida et al., arXiv:0709.2739,
• “Modelling discontinuities and Kelvin-Helmholtz instabilities in SPH” by Price, arXiv:0709.2772,
• “Star Formation at Very Low Metallicity. IV. Fragmentation does not depend on metallicity for cold initial conditions” by Jappsen et al.,arXiv:0709.3530,
• “Numerical simulations of the type III migration:I. Disc model and convergence tests” and II. Inward migration of massive planets by Peplinski, Artymowicz, & Mellema, arXiv:0709.3622 and arXiv:0709.3754; and
• “Interaction and ablation of fall-back disks in isolated neutron stars” by Jones, arXiv:0709.3730.

Thu, Sep 20, 2007

• “A constrained-transport magnetohydrodynamics algorithm with near-spectral resolution” by Maron, Mac Low, & Oishi, arXiv:0709.1234,
• “Morphology of flows and buoyant bubbles in the Virgo cluster” by Pavlovski et al., arXiv:0709.1790,
• “Dynamics of buoyant bubbles in clusters of galaxies” by Pavlovski, Kaiser, & Pope, arXiv:0709.1796,
• “Cooling, Gravity and Geometry: Flow-driven Massive Core Formation” by Heitsch et al., arXiv:0709.2451,
• “The Formation of Fragments at Corotation in Isothermal Protoplanetary Disks” by Durisen, Hartquist, & Pickett, arXiv:0709.1445; and
• “On the corotation torque in a radiatively inefficient disk” by Baruteau & Masset, arXiv:0709.2617.

Thu, Sep 13, 2007

• “Magnetic Braking and Protostellar Disk Formation: The Ideal MHD Limit” by Mellon & Li, arXiv:0709.0445,
• “Strong Imbalanced Turbulence” by Beresnyak & Lazarian, arXiv:0709.0554,
• “A Rigid-Field Hydrodynamics approach to modeling the magnetospheres of massive stars” by Townsend, Owocki, & ud-Doula, arXiv:0709.0694,
• “Three-Dimensional Simulations of Inflows Irradiated by a Precessing Accretion Disk in Active Galactic Nuclei: Formation of Outflows” by Kurosawa & Proga, arXiv:0709.0951; and
• “Can giant planets form by gravitational fragmentation of discs?” by Stamatellos & Whitworth, arXiv:0709.0966.

Thu, Sep 6, 2007

• “Anisotropic fluxes and nonlocal interactions in MHD turbulence” by Alexakis, Bigot, & Politano, arXiv:0708.0765,
• “Ionization Front Instabilities in Primordial HII Regions” by Whalen & Norman, arXiv:0708.2444,
• “Rapid planetesimal formation in turbulent circumstellar disks” by Johansen et al., arXiv:0708.3890,
• “Energetic Impact of Jet Inflated Cocoons in Relaxed Galaxy Clusters” by Vernaleo & Reynolds, arXiv:0708.4015,
• “Convective and non-convective mixing in AGB stars” by Herwig et al., arXiv:0709.0197; and
• “Mixing of shear Alfven wave packets ” by Bian & Tsiklauri, arXiv:0709.0260.

Thu, Aug 2, 2007

• “Magnetic braking in young late-type stars: the effect of polar spots” by Aibéo, Ferreira, & Lima, arXiv:0707.2476,
• “Energy spectra stemming from interactions of Alfven waves and turbulent eddies” by Mininni & Pouquet, arXiv:0707.2661,
• “The Bipolar Engines of post-AGB stars: Transient Dynamos and Common Envelopes” by Nordhaus & Blackman, arXiv:0707.2975,
• “Aspects of Density Fluctuations in Compressible MHD Turbulence” by Kowal & Lazarian, arXiv:0707.3847; and
• “Different Methods of Forming Cold Fronts in Non-Merging Clusters” by Dupke, White, & Bregman, arXiv:0707.4001.

Thu, Jul 26, 2007

We will discuss the following papers:

• “Shock waves in tidally compressed stars by massive black holes” by Brassart & Luminet, arXiv:0707.2476,
• “Experimental analysis of the Strato-rotational Instability in a cylindrical Couette flow” by Le Bars & Le Gal, arXiv:0707.2661,
• “Particle Stirring in Turbulent Gas Disks: Including Orbital Oscillations” by some guys named Youdin & Lithwick, arXiv:0707.2975,
• “Mixing in massive stellar mergers” by Gaburov et al., arXiv:0707.3021; and, as a classic paper, this week we'll discuss,
• “Magnetohydrodynamic winds and jets from Accretion Disks” by Spruit, astro-ph/9602022.

Thu, Jul 19, 2007

• “Magnetic double gradient instability and flapping waves in a current sheet” by Erkaev, Semenov, & Biernat, arXiv:0707.0935,
• “Long-Term Gravitational Quenching by Clumpy Accretion in Galaxies and Clusters” by Dekel & Birnboim, arXiv:0707.1214,
• “Structure and Evolution of Giant Cells in Global Models of Solar Convection” by Miesch et al., arXiv:0707.1450,
• “The Generation and Dissipation of Interstellar Turbulence - Results from Large Scale High Resolution Simulations” by de Avillez & Breitschwerdt, arXiv:0707.1740; and, as a classic paper, this week we'll discuss,
• “Hydromagnetic flows from accretion discs and the production of radio jets” by Blandford & Payne, (1982) MNRAS 199:883.

Thu, Jul 12, 2007

• “The Thermal Regulation of Gravitational Instabilities in Protoplanetary Disks. IV. Simulations with Envelope Irradiation” by Cai et al., arXiv:0706.4046,
• “On gas drag in a circular binary system” by Ciecielag et al., arXiv:0707.0410,
• “How to define the boundaries of a convective zone and how extended is overshooting?” by Deng & Xiong, arXiv:0707.0924,
• “Nonlinear Evolution of the Magnetohydrodynamic Rayleigh-Taylor Instability” by Stone & Gardiner, arXiv:0707.1022; and, following up on our discussion of She & Leveque (1994) last week, this week we'll discuss,
• “Scaling Properties of Three-Dimensional Magnetohydrodynamic Turbulence” by Müller & Biskamp, (2000) Phys Rev Let 84:475, and
• “Simulations of Magnetohydrodynamic Turbulence in a Strongly Magnetized Medium” by Cho, Lazarian, & Vishniac, (2002) ApJ 564:291.

Thu, Jul 5, 2007

• “Can Protostellar Jets Drive Supersonic Turbulence in Molecular Clouds?” by Banerjee, Klessen, & Fendt, arXiv:0706.3640,
• “Molecular cloud formation and magnetic fields in spiral galaxies” by Dobbs, PRice, & Bonnell, arXiv:0706.3862,
• “Radial and vertical angular momentum transport in protostellar discs” by Salmeron, Königl, & Wardle, arXiv:0706.4199,
• “Gap Formation in the Dust Layer of 3D Protoplanetary Disks” by Maddison et al., arXiv:0706.4248,
• “The Nonlinear Evolution of Instabilities Driven by Magnetic Buoyancy: A New Mechanism for the Formation of Coherent Magnetic Structures” by Kersale, Hughes & Tobias, arXiv:0706.4463, and, a classic paper,
• “Universal scaling laws in fully developed turbulence” by She & Leveque, (1994) Phys Rev Let 72:336.

Thu, Jun 28, 2007

• “The Interaction Of Multiple Convection Zones In A-type Stars” by Silvers & Proctor, arXiv:0706.2976,
• “Vortex generation in protoplanetary disks with an embedded giant planet” by de Val-Borro et al, arXiv:0706.3200,
• “Bubble-Wrap for Bullets: The Stability Imparted By A Thin Magnetic Layer” by Dursi, arXiv:0706.3216, and
• “Two-flow magnetohydrodynamical jets around young stellar objects” by Casse, Meliani & Sauty, arXiv:0706.3312.

Thu, Jun 21, 2007

• “Super stellar clusters with a bimodal hydrodynamic solution: an Approximate Analytic Approach” by Wunsch et al., arXiv:0706.1889,
• “GRMHD/RMHD Simulations and Stability of Magnetized Spine-Sheath Relativistic Jets” by Hardee, Mizuno & Nishikawa, arXiv:0706.1916,
• “Numerical Measurements of the Spectrum in Magnetohydrodynamic Turbulence” Mason, Cattaneo, & Boldyrev, arXiv:0706.2003, and
• “The excitation and evolution of density waves” and “The excitation of density waves at the Lindblad and corotation resonances by an external potential” by Goldreich & Tremaine ApJ 1978 222:850 and ApJ 1979 233:857.

Thu, Jun 14, 2007

• “Scaling Laws and Intermittency in Highly Compressible Turbulence” by Kritsuk et al., arXiv:0706.0739,
• “On the Magnetic Prandtl Number Behavior of Accretion Disks” by Balbus & Henri, arXiv:0706.0828,
• “Inside-Out Evacuation of Transitional Protoplanetary Disks by the Magneto-Rotational Instability” by Chiang & Murray-Clay, arXiv:0706.1241, and
• “A powerful local shear instability in weakly magnetized disks. I - Linear analysis.” and “ II - Nonlinear evolution” by Balbus & Hawley (1991), ApJ 1991 376:214 and ApJ 1991 376:223.

Thu, Apr 26, 2007

• “Fluctuation dynamo and turbulent induction at low magnetic Prandtl numbers” by Schekochihin et al., arXiv:0704.2002,
• “Analysis of the Effect of a Mean Velocity Field on Mean Field Dynamo” by Kandus, arXiv:0704.2217,
• “On the Prospects for Detection and Identification of Low-Frequency Oscillation Modes in Rotating B Type Stars” by Daszynska-Daszkiewicz, Dziembowski, & Pamyatnykh, arXiv:0704.2279,
• “GRB blastwaves through wind-shaped circumburst media” by Meliana & Keppens, arXiv:0704.2461, and
• “3D Radiative Hydrodynamics for Disk Stability Simulations: A Proposed Testing Standard and New Results” by Boley et al., arXiv:0704.2532.

Thu, Apr 19, 2007

• “Interaction of Supernova Ejecta with Nearby Protoplanetary Disks” by Oullette, Desch, & Hester, arXiv:0704.1652,
• “Dissipation of Magnetic Flux in Primordial Star Formation:From Run-away Phase to Mass Accretion Phase” by Maki & Susa, arXiv:0704.1853,
• “Magnetorotational Collapse of Population III Stars” by Suwa et al. arXiv:0704.1945, and
• “Turbulent Mixing in the Surface Layers of Accreting Neutron Stars” by Piro & Bildsten, arXiv:0704.1278.

Thu, Apr 5, 2007

• “Secular instability in a quasi-viscous accretion disc” by Bhattacharjee & Ray, astro-ph/0703304,
• “Three-Dimensional Dynamical Instabilities in Galactic Ionization Fronts” by Whalen & Norman, astro-ph/0703463,
• “Compressibility and local instabilities of differentially rotating magnetized gas” by Bonanno & Urpin, astro-ph/0703519,
• “Unstable magnetohydrodynamical continuous spectrum of accretion disks. A new route to magnetohydrodynamical turbulence in accretion disks” by Blokland, Keppens, & Goedbloed, astro-ph/0703581, and:
• “Impact of tangled magnetic fields on AGN-blown bubbles” by Ruszkowski et al., astro-ph/0703801.

Thu, Mar 15, 2007

• “Rossby waves in "shallow water" magnetohydrodynamics” by Zaqarashvili et al., astro-ph/0703105,
• “Protostellar Turbulence Driven by Collimated Outflowso; by Nakamura & Li, astro-ph/0703152,
• “The Cluster-Merger Shock in 1E 0657-56: Faster than the Speeding Bullet?” by Milosavljevic et al., astro-ph/0703199, likely paired with “The speed of the `bullet' in the merging galaxy cluster 1E0657-56” by Springel & Farrar, astro-ph/0703232, and:
• “Secondary Perturbation Effects in Keplerian Accretion Disks: Elliptical Instability” by Mukhopadhyay, astro-ph/0703201.

Thu, Mar 8, 2007

• “Fluid Dynamics of Relativistic Blast Waves” by Blandford & McKee, 1976, Phys Fluids v19 p1130,
• “A solar surface dynamo” by Voegler & Schuessler, astro-ph/0702681,
• “Observational Consequenes of Hydrodynamic Flows on Hot Jupiters” by Langton & Laughlin, astro-ph/0702700; and
• “On the nonlinear saturation of the magnetorotational instability near threshold in a thin-gap Taylor-Couette setup” by Umurhan, Regev, & Menou, astro-ph/0702747.

Thu, Mar 1, 2007

• “Protoplanetary Disk Turbulence Driven by the Streaming Instability: Linear Evolution and Numerical Methods” by Youdin & Johansen, astro-ph/0702625,
• “Protoplanetary Disk Turbulence Driven by the Streaming Instability: Non-Linear Saturation and Particle Concentration” by Johansen & Youdin, astro-ph/0702626,
• “Simulations of Magnetically-Driven Supernova and Hypernova Explosions in the Context of Rapid Rotation” by Burrows et al., astro-ph/0702539; and
• “Vortex flow generated by a magnetic stirrer” by Halasz et al.physics/0702199.

Thu, Feb 22, 2007

• Classic paper discussion: “Ambipolar Diffusion in Self-Gravitating Isothermal Layers” by Shu, 1983 ApJ, v273, p202;
• “The dynamics of a fully radiative rapidly rotating star” by Lara & Rieutord, astro-ph/0702255,
• “The Stability of Double White Dwarf Binaries Undergoing Direct Impact Accretion” by Motl et al., astro-ph/0702388; and
• “Tidal dissipation in rotating solar-type stars” by Ogilvie & Lin, astro-ph/0702492.

Thu, Feb 8, 2007

• Classic paper discussion: “The dynamic and gravitational instabilities of spherical shocks” by Vishniac, Onishi, & Yamada, 1983 ApJ, v274, p152;
• “Molecular cloud regulated star formation in galaxies” by Booth, Theuns, & Okamoto, astro-ph/0701877; and
• “Bubbles as tracers of heat input to cooling flows” by Binney, Bibi, & Omma, astro-ph/0701891.

Thu, Feb 1, 2007

• “The g-mode Excitation in the Proto Neutron Star by the Standing Accretion Shock Instability” by Yoshida, Onishi, & Yamada, astro-ph/0701643;
• “Understanding the Spins of Young Stars” by Matt & Pudritz, astro-ph/0701648;
• “Gravitational Runaway and Turbulence Driving in Star-Gas Galactic Disks” by Kim & Ostriker, astro-ph/0701755;
• “Two regimes of Turbulent Fragmentation and the stellar IMF from Primordial to Present Day Star Formation” by , Padoan et al., astro-ph/0701795; and
• “Photon Bubbles in the Circumstellar Envelopes of Young Massive Stars” by Turner, Quataert, & Yorke, astro-ph/0701800.

Thu, Jan 25, 2007, 11:10 AM

• “Cooling of Neutron Stars with Strong Toroidal Magnetic Fields” by Page, Geppert, & Kueker, astro-ph/0701442;
• “Destabilisation of hydrodynamically stable rotation laws by azimuthal magnetic fields” by Ruediger et al., astro-ph/0701454;
• “Ionisation-induced star formation II: External irradiation of a turbulent molecular cloud ” by Dale, Clark, & Bonnell, astro-ph/0701497; and
• “Predicting solar cycle 24 with a solar dynamo model” by Choudhuri, Chatterjee, & Jiang, astro-ph/0701527.

Thu, Jan 18, 2007, 11:10 AM

• “Protostellar outflow-driven turbulence” by Matzner, astro-ph/0701022;
• “Generation of magnetic field by dynamo action in a turbulent flow of liquid sodium” by Monchaux et al., physics/0701075;
• “Analytic Approach to the Stability of Standing Accretion Shocks: Application to Core-Collapse Supernovae” by Laming, astro-ph/0701264;
• “Structure and stability of the magnetic solar tachocline” by Rüdiger, & Kitchatinov, astro-ph/0701373; and
• “The study of colliding molecular clumps evolution” by Vinogradov & Berczik, astro-ph/0701377.

Thu, Jan 11, 2007, 11:10 AM

• “Protostellar outflow-driven turbulence” by Matzner, astro-ph/0701022;
• “Experiments on the magnetorotational instability in helical magnetic fields” by Stefani et al., astro-ph/0701030;
• “The Hall instability of weakly ionized, radially stratified, rotating disks” by Liverts, Mond, & Chenin, astro-ph/0701086;
• “The evolution of magnetic tower jets in the laboratory” by Ciardi et al., astro-ph/0611441;
• “Simulations of star formation in a gaseous disc around sgr A* - a failed AGN” by Nayakshin, Cuadra, & Springel, astro-ph/0701141; and
• “MHD evolution of a fragment of a CME core in the outer solar corona” by Pagano et al., astro-ph/0701145.

Thu, Jan 4, 2007, 11:10 AM

• “Massive star formation via high accretion rates and early disk-driven outflows” by Banerjee & Pudritz, astro-ph/0612674;
• “Spectral Methods for Time-Dependent Studies of Accretion Flows. III. Three-Dimensional, Self-gravitating, Magnetohydrodynamic Disks” by Chan, Psaltis, & Ozel, astro-ph/0612742;
• “The Role of Ambipolar Diffusion in the Formation Process of Moderately Magnetized Diffuse Clouds ” by Inoue, Inutsuka, & Koyama, astro-ph/0612770; and
• “Inflating Fat Bubbles in Clusters of Galaxies by Wide Jets” by Sternberg, Pizzolato, & Soker, astro-ph/0612760.

Thu, Dec 14, 2006, 11:10 AM

• “Accretion Discs with Strong Toroidal Magnetic Fields” by Begelman & Pringle, astro-ph/0612300;
• “The fundamental difference between alpha viscosity and turbulent magnetorotational stresses” by Pessah, Chan & Psaltis, astro-ph/0612404;
• “Multiple Solutions in Fluid Mechanics: Uncertainty of Convection” by Yao & Moulic, physics/0612112;
• “Three dimensional numerical simulations of acoustic wave field in the upper convection zone of the Sun” by Parchevsky & Kosovichev, astro-ph/0612364; and
• “Magnetohydrodynamic Turbulence: Generalized Energy Spectra” by Shivamoggi, physics/0612147.

Thu, Dec 14, 2006, 11:10 AM

• “Ionisation-induced star formation I: The collect and collapse model” by Dale, Bonnell & Whitworth, astro-ph/0612128;
• “Three Dimensional Simulations of the Core Helium Flash - with Rotation” by Lattanzio et al., astro-ph/0612147;
• “Late-Time Convection in the Collapse of a 23 Solar Mass Star” by Fryer & Young, astro-ph/0612154;
• “On self-sustaining processes in Rayleigh-stable rotating plane Couette flows and subcritical transition to turbulence in accretion disks” by Rincon, Ogilvie & Cossu, astro-ph/0612180; and
• “Saturation of the Magnetothermal Instability in Three Dimensions” by Parrish & Stone, astro-ph/0612195.

Thu, Dec 7, 2006, 11:10 AM

• “Dust dynamics during protoplanetary disc clearing” by Alexander & Armitage, astro-ph/0611821;
• “Theories of convection and the spectrum of turbulence in the solar photosphere” by Rincon, astro-ph/0611842;
• “Mesoscale flows in large aspect ratio simulations of turbulent compressible convection” by Rincon, astro-ph/0611843;
• “On the Nature of Incompressible Magnetohydrodynamic Turbulence” by Gogoberidze, astro-ph/0611894; and
• “AGN self-regulation in cooling flow clusters” by Cattaneo & Teyssier, astro-ph/0611914.

Thu, Nov 30, 2006, 11:10 AM

• “Hydromagnetic Instability in Differentially Rotating Flows” by Bonanno & Urpin, astro-ph/0611743;
• “Pulsar spins from an instability in the accretion shock of supernovae” by Blondin & Mezzacappa, astro-ph/0611680; and
• “The Destruction of ³He by Rayleigh-Taylor Instability on the First Giant Branch ” by Eggleton, Dearborn, & Lattanzio, astro-ph/0611609.

Thu, Nov 2, 2006, 11:10 AM

• “Dynamical Evolution of a Supernova Driven Turbulent Interstellar Medium” by Breitschwerdt & Avillez, astro-ph/0610666;
• “Can cellular convection in a rotating spherical shell maintain both global and local magnetic fields?” by Getling et al., astro-ph/0610753;
• “Turbulence Spectra from Doppler-shifted Spectral Lines” by Lazarian, astro-ph/0610765; and
• “Turbulence Effects at Small Scales” by Beresnyak & Lazarian, astro-ph/0610766.

Thu, Oct 26, 2006, 11:10 AM

• “Three-dimensional hydrodynamic simulations of asymmetric pulsar wind bow shocks” by Vigelius et al., astro-ph/0610454;
• “A Local Model for Angular Momentum Transport in Accretion Disks Driven by the Magnetorotational Instability” by Pessah, Chan, & Psaltis, astro-ph/0610565;
• “Energy- and flux-budget (EFB) turbulence closure model for stably stratified flows” by Zilitinkevich et al., physics/0610159;
• “The Difficulty of the Heating of Cluster Cooling Flows by Sound Waves and Weak Shocks” by Fujita & Suzuki, astro-ph/0610604; and
• “Magnetocentrifugal Winds in 3D: Nonaxisymmetric Steady State” by Anderson et al., astro-ph/0610630.

Thu, Oct 19, 2006, 11:10 AM

• “AGN Heating of Cooling Flow Clusters: Problems with 3D Hydrodynamic Models” by Vernaleo & Reynolds, astro-ph/0610338;
• “On the formation of terrestrial planets in hot-Jupiter systems” by Fogg & Nelson, astro-ph/0610314;
• “The minimum mass for star formation, and the origin of binary brown dwarfs” by Whitworth & Stamatellos, astro-ph/0610039;
• “Features of the Acoustic Mechanism of Core-Collapse Supernova Explosions” by Burrows et al., astro-ph/0610175; and
• “The role of the energy equation in the fragmentation of protostellar discs during stellar encounters” by Lodato et al., astro-ph/0610201.

Thu, Oct 12, 2006, 11:10 AM

• “Global-Scale Turbulent Convection and Magnetic Dynamo Action in the Solar Envelope” by Brun, Miesch, & Toomre, astro-ph/0610073;
• “Simulations of core convection in rotating A-type stars: Magnetic dynamo action” by Brun, Browning,& Toomre, astro-ph/0610072;
• “Jets and Disk-Winds from Pulsar Magnetospheres” by Lovelace, Turner, & Romanova, astro-ph/0610087;
• “Features of the Acoustic Mechanism of Core-Collapse Supernova Explosions” by Burrows et al., astro-ph/0610175; and
• “The role of the energy equation in the fragmentation of protostellar discs during stellar encounters” by Lodato et al., astro-ph/0610201.

Thu, Oct 5, 2006, 11:10 AM

• “Fundamental differences between SPH and grid methods” by Agertz et al., astro-ph/0610051;
• “Radiation-Hydrodynamic Simulations of Collapse and Fragmentation in Massive Protostellar Cores” by Krumholz, Klein, & McKee, astro-ph/0609798;
• “Molecular Cloud Turbulence And The Star Formation Efficiency: Enlarging the Scope” by Vazquez-Semadeni, astro-ph/0609716; and
• “Isolated vs. Common Envelope Dynamos in Planetary Nebula Progenitors” by Nordhaus, Blackman, & Frank, astro-ph/0609726; and
• “Simulation of the Magnetothermal Instability” by Parrish & Stone, astro-ph/0609732.

Thu, Sep 28, 2006, 11:10 AM

• “Convective cooling and fragmentation of gravitationally unstable disks” by Rafikov, astro-ph/0609549;
• “Magnetic Activity in Stellar Merger Products” by Soker & Tylenda, astro-ph/0609552;
• “Numerical requirements for simulations of self gravitating and non-self gravitating disks” by Nelson, astro-ph/0609493; and
• “General Relativistic Simulations of Slowly and Differentially Rotating Magnetized Neutron Stars” by Etienne, Liu, & Shapiro, astro-ph/0609634; and
• “The Accretion and Cooling of Preheated Gas in Dark Matter Halos” by Lu & Mo, astro-ph/0609640.

Thu, Sep 21, 2006, 11:10 AM

• “Supersonic turbulence, filamentary accretion,and the rapid assembly of massive stars and disks” by Banerjee, Pudritz & Anderson, astro-ph/0609428;
• “Effects of Rotation and Input Energy Flux on Convective Overshooting” by Käpylä et al., astro-ph/0609350;
• “Nonlinear shear-current dynamo and magnetic helicity transport in sheared turbulence” by Rogachevskii, Kleeorin, & Liverts, astro-ph/0609256; and
• “Viscous overstability and eccentricity evolution in three-dimensional gaseous discs” by Latter & Ogilvie, astro-ph/0609158.

Thu, Aug 24, 2006, 11:10 AM

• “Comparison of Two Scale-Dependent Dynamic Subgrid-Scale Models for Simulations of Neutrally Buoyant Shear-Driven Atmospheric Boundary Layer Flows” by Anderson, Basu, & Letchford, physics/0608159;
• “Evolution of Giant Planets in Eccentric Disk” by D'Angelo, Lubow & Bate, astro-ph/0608355;
• “Molecular Cloud Evolution II. From cloud formation to the early stages of star formation in decaying conditions” by Vazquez-Semadeni et al., astro-ph/0608375;
• “A weakly nonlinear analysis of the magnetorotational instability in a model channel flow” by Umurhan, Menou & Regev, astro-ph/0608374;
• “Growing hydrodynamic modes in Keplerian accretion disks during secondary perturbations: Elliptical vortex effects” by Mukhopadhyay, astro-ph/0608402; and
• “An Exact, Three-Dimensional, Time-Dependent Wave Solution in Local Keplerian Flow” by Balbus & Hawley, astro-ph/0608429.

Thu, Aug 17, 2006

• “Shock-cloud interaction in the Vela SNR II. Hydrodynamic model” by Miceli et al., physics/0608063;
• “Interstellar Turbulence Driving by Galactic Spiral Shocks” by Kim, Kim & Ostriker, astro-ph/0608161;
• “Effect of the Earth's Coriolis force on the large-scale circulation of turbulent Rayleigh-Benard convection” by Brown & Ahlers, astro-ph/0608110; and
• “Numerical Study on GRB-Jet Formation in Collapsars” by Nagataki et al., astro-ph/0608233.

Thu, Aug 10, 2006

• “Small scale structures in three-dimensional magnetohydrodynamic turbulence” by Mininni, Pouquet, & Montgomery, physics/0607269;
• “Enhancement and suppression of heat transfer by MHD turbulence” by Lazarian, astro-ph/0608045;
• “Intermittency of Magnetohydrodynamic Turbulence: Astrophysical Perspective” by Lazarian, astro-ph/0608048;
• “Density Fluctuations in MHD turbulence: spectra, intermittency and topology” by Kowal, Lazarian, & Beresnya, astro-ph/0608051; and
• “The Effects of Rotation Rate on Deep Convection in Giant Planets with Small Solid Cores” by Evonuk &Glatzmaier, astro-ph/0607584.

Thu, Aug 3, 2006

• “Imbalanced Strong MHD Turbulence” by Lithwick, Goldreich, & Sridhar, astro-ph/0607243;
• “The Effects of Rotation Rate on Deep Convection in Giant Planets with Small Solid Cores” Evonuk &Glatzmaier, astro-ph/0607584;
• “Evolution of Collapse Nonuniformity for Rotating Magnetic Interstellar Clouds” Dudorov, Zhilkin, & Zhilkina, astro-ph/0607588;
• “A Gravitational Instability-Driven Viscosity in Self-Gravitating Accretion Disks” Duschl & Britsch, astro-ph/0607610; and
• “High Resolution Simulations of Supersonic Turbulence in Molecular Clouds” by Kritsuk et al., astro-ph/0607634.

Thu, Jul 27, 2006

• “The Virial Balance of Clumps and Cores in Molecular Clouds” Dib et al., astro-ph/0607362;
• “An Eccentric Circumbinary Accretion Disk and the Detection of Binary Massive” by Macfadyen & Milosavljevic, astro-ph/0607467; and
• “Effect of Rossby and Alfvén waves on the dynamics of the tachocline” by Leprovost & Kim, astro-ph/0607545.

Thu, Jul 6, 2006

• “Astrophysical Explosions Driven by a Rotating, Magnetized, Gravitating Sphere” by Matt, Frank, & Blackman, astro-ph/0606741;
• “A Universal Magnetic Helicity Integral” by Hornig, astro-ph/0606694;
• “Mass Accretion onto T Tauri Stars” by Gregory et al., astro-ph/0606682; and
• “The Answer is Blowing in the Wind: Simulating the interaction of Jets with Dynamic Cluster Atmospheres” by Heinz et al., astro-ph/0606664.

Thu, Jun 25, 2006

• “Rayleigh-Taylor turbulence is nothing like Kolmogorov's in the self similar regime” by Poujade, physics/0606136;
• “Magneto-Rotational Transport in the Early Sun” by Menou & LeMer, astro-ph/0606358;
• “Fragmentation of gravitationally unstable gaseous protoplanetary disks with radiative transfer” by Mayer et al., astro-ph/0606361; and
• “Experimental evidence for magnetorotational instability in a helical magnetic field” by Stefani et al., astro-ph/0606473.

Thu, May 18, 2006

• “Accretion onto Magnetized Neutron Stars: Structure and Interchange Instability of a Model Magnetosphere” by Arons & Lea, (1976) ApJ 207:914,
• “Evolution of magnetized, differentially rotating neutron stars: Simulations in full general relativity” by Duez et al., astro-ph/0605331;
• “The magnetic nature of disk accretion onto black holes” by Miller et al., astro-ph/0605390; and
• “A New Mechanism for Gravitational Wave Emission in Core-Collapse Supernovae” by Ott et al., astro-ph/0605493.

Thu, May 11, 2006

• “MHD Turbulent Mixing Layers: Equilibrium Cooling Models” by Esquivel et al., astro-ph/0605062;
• “Simulating the formation of molecular clouds. I. Slow formation by gravitational collapse from static initial conditions” by Glover & Mac Low, astro-ph/0605120;
• “AGN Jet Mass Loading and Truncation by Stellar Winds” by Hubbard & Blackman, astro-ph/0604585; and
• “Accretion onto Magnetized Neutron Stars: Structure and Interchange Instability of a Model Magnetosphere” by Arons & Lea, (1976) ApJ 207:914.

Thu, May 4, 2006

• “Solar differential rotation and meridional flow: The role of a subadiabatic tachocline for the Taylor-Proudman balance” by Rempel, astro-ph/0604451;
• “Hot Accretion With Conduction: Spontaneous Thermal Outflows” by iTanaka & Menou, astro-ph/0604509;
• “Structure and Stability of Phase Transition Layers in Interstellar Medium” by Inoue, Inutsuka, & Koyama, astro-ph/0604564; and
• “Outflows driven by Giant Protoplanets” by Machida, Inutsuka, & Matsumoto, astro-ph/0604594.

Thu, Apr 27, 2006

• “Laboratory Plasma Dynamos, Astrophysical Dynamos, and Magnetic Helicity Evolution” by Blackman & Ji, astro-ph/0604221;
• “Can the thermal instability drive turbulence?” by Brandenburg et al., astro-ph/0604224;
• “Pulsational Instabilities in Accreting White Dwarfs” by Arras, Townsley, & Bildsten, astro-ph/0604319; and
• “ITER Physics Basis: Chapter 1: Overview and Summary” by the ITER collaboration, Nucl. Fusion 39:2137;

Thu, Apr 20, 2006

• “Laboratory Plasma Dynamos, Astrophysical Dynamos, and Magnetic Helicity Evolution” by Blackman & Ji, astro-ph/0604221;
• “Can the thermal instability drive turbulence?” by Brandenburg et al., astro-ph/0604224;
• “Pulsational Instabilities in Accreting White Dwarfs” by Arras, Townsley, & Bildsten, astro-ph/0604319; and
• “ITER Physics Basis: Chapter 1: Overview and Summary” by the ITER collaboration, Nucl. Fusion 39:2137;

Thu, Apr 13, 2006

• “Vorticies in Thin, Compressible, Unmagnetized Disks” by Johnson & Gammie, astro-ph/0604034;
• “A Model for Spontaneous Onset of Fast Magnetic Reconnection” by Cassak, Drake & Shay, physics/0604001;
• “A Revised Prescription for the Tayler-Spruit Dynamo: Magnetic Angular Momentum Transport in Stars” by Denissenkov & Pinsonneault, astro-ph/0604045; and
• “2d and 3d MHD Simulations of Disk Accretion by Rotating Magnetized Stars: Search for Variability” by Romanova et al., astro-ph/0604116;

Thu, Apr 6, 2006

• “Magnetorotational supernovae with jets” by Moiseenko, Bisnovatyi-Kogan & Ardeljan, astro-ph/0603789;
• “The interaction of gravitational waves with strongly magnetized plasmas” by Isliker & Vlahos, astro-ph/0603828;
• “Producing ultra-strong magnetic fields in neutron star mergers” by Price & Rosswog, astro-ph/0603845;
• “Radiative Shock-Induced Collapse of Intergalactic Clouds” Fragile et al., (2004; ApJ 604:74); and
• “Intergalactic Magnetic Fields from Quasar Outflows” by Furlanetto & Loeb, (2001; ApJ 556:619).

Thu, Mar 23, 2006

• “On the mean field dynamo with Hall effect” Kandus, Vasconcelos & Cerqueira, astro-ph/0603348;
• “Molecular Cloud Turbulence and Star Formation” by Ballesteros-Paredes et al., astro-ph/0603357;
• “Magnetic field confinement by meridional flow and the solar tachocline” by Kitchatinov & Ruediger, astro-ph/0603417;
• “The Origin of the Initial Mass Functionn” by Bonnell, Larson, & Zinnecker, astro-ph/0603447; and
• “Second Core Formation and High Speed Jets: Resistive MHD Nested Grid Simulations” by Machida, Inutsuka, & Matsumoto, astro-ph/0603456.

Thu, Mar 16, 2006

• “Dust flow in gas disks in the presence of embedded planets” by Paardekooper & Mellma, astro-ph/0603132;
• “The signature of the magnetorotational instability in the Reynolds and Maxwell stress tensors in accretion discs” by Pessah, Chan, & Psaltis, astro-ph/0603178;
• “Gravitational Instabilities in Gaseous Protoplanetary Disks and Implications for Giant Planet Formation” by Durisen et al., astro-ph/0603179; and
• “On the effects of turbulence on a screw dynamo” by Raedler & Stepanov, physics/0603085.
• “Star Formation in Space and Time: The Orion Nebula Cluster” by Huff & Stahler, astro-ph/0603138.

Thu, Mar 9, 2006

• “Suppressing cluster cooling flows by multiple AGN activity” by Nusser, Silk & Babul, astro-ph/0602566;
• “Hysteresis phenomenon in turbulent convection” by Eidelman et al., physics/0602176;
• “Star formation in molecular cores III. The effect of the turbulent power spectrum” by Goodwin, Whitworth, & Ward-Thompson, astro-ph/0602615; and
• “Magnetic Field Confinement in the Corona: Role of Magnetic Helicity Accumulation” by Zhang, Flyer, & Low, astro-ph/0603011.

Thu, Mar 2, 2006

• “Numerical simulations of current generation and dynamo excitation in a mechanically-forced, turbulent flow” by Bayliss et al., physics/0602126;
• “Magnetohydrodynamic activity inside a sphere” by Mininni & Montgomery, physics/0602147;
• “Turbulent Elasticity of the Solar Convective Zone and the Taylor Number Puzzle” by Williams, astro-ph/0602502; and
• “Effect of heat flux on differential rotation in turbulent convection” by Kleeorin & Rogachevskii, astro-ph/0602544.

Thu, Feb 23, 2006

• “Anisotropic weak turbulence of Alfven waves in collisionless astrophysical plasmas” by Luo & Melrose, astro-ph/0602295;
• “The evolution of misaligned accretion discs and spinning black holes” by Lodato & Pringle, astro-ph/0602306;
• “The Weak Field Limit of the Magnetorotational Instability” by Krolik & Zweibel, astro-ph/0602317; and
• “Polarization Alignment in Driven Magnetohydrodynamic Turbulence” by Mason, Cattaneo & Boldyrev, astro-ph/0602382.

• “Magnetic pressure support and accretion disk spectra” by Blaes et al., astro-ph/0601380;
• “The Formation of Massive Stars” by Buether et al., astro-ph/0602012;
• “Magnetoconvection and dynamo coefficients III: alpha-effect and magnetic pumping in the rapid rotation regime” by Käpylä et al., astro-ph/0602111; and
• “The formation of molecular clouds in spiral galaxies” by Dobbs et al., astro-ph/0602103.

Thu, Feb 9, 2006

Discussion of MHD turbulence

• “Turbulence and Magnetic Fields in Astrophysical Plasmas” by Schekochihin & Cowley, astro-ph/0507686;
• “Numerical Simulations of Magnetic Fields in Astrophysical Turbulence” by Zweibel, Heitsch, & Fan, astro-ph/0202525; and
• “MHD Turbulence: Scaling Laws and Astrophysical Implications” by Cho, Lazarian & Vishniac, astro-ph/0205286

Thu, Feb 2, 2006

• “Anisotropy, inhomogeneity and inertial range scalings in turbulent convection” by Rincon, physics/0601198
• “Stopping Cooling Flows with Jets” by Brighenti & Mathews, astro-ph/0601555
• “Magnetic helicity in primordial and dynamo scenarios of galaxies” by Brandenburg, astro-ph/0601278
• “Rapid Formation of Gas Giant Planets around M Dwarf Stars” by Boss, astro-ph/0601486

Discussion by S. Stanley, Toronto, on ``Numerical Modelling of Planetary Dynamos''.

Thu, Jan 19, 2006

Rodrigo Fernández will give us a brief discussion of

• “Braking the Gas in the beta Pictoris Disk” by Fernández, astro-ph/0601244

• “Dynamo action at low magnetic Prandtl numbers: mean flow vs. fully turbulent motion” by Ponty, physics/0601105
• “Turbulence, magnetic fields and plasma physics in clusters of galaxies” by Schekochihin & Cowley, astro-ph/0601246
• “On the Formation of Gas Giant Planets on Wide Orbits” by Boss, astro-ph/0601278

Thu, Jan 12, 2006

• “Influence of turbulence on the dynamo threshold” by Laval et al., physics/0601062, and
• “Hydrodynamic simulations of He-shell flash convection” by Herwig et al.,astro-ph/0601164.

Recent astro hydro papers and online comments on them are available at http://www.cita.utoronto.ca/~ljdursi/thisweek/index.php.