Dust coagulation
A. Chokshi, A. G. G. M. Tielens, D. Hollenbach;
ApJ, 1993, 407, 806
ABSTRACT:The microphysics of coagulation between two, colliding, smooth, spherical grains in the elastic limit is investigated, and the criteria for
sticking as a function of particle sizes, collision velocities, elastic
properties, and binding energy are calculated.
Critical relative velocities for
coagulation were evaluated as a function of grain sizes for solicate, icy, and
carbonaceous grains.
It is concluded that efficient coagulation requires
coverage of grain cores by an icy grain mantle.
In this case, coagulation leads
to only a doubling of the mass of a large grain within a dense core
lifetime.
It is concluded that coagulation can have a dramatic effect on the visible
and, particularly, the UV portion of the extinction curve in dense clouds
and on their IR spectrum.
KEYWORDS: coagulation, interplanetary dust, interplanetary medium, planetary evolution, solar system, grain size, molecular clouds, silicones, stellar envelopes, surface roughness
PERSOKEY:dust, size distribution, ,
CODE: chokshi93