Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.212...43d&link_type=abstract
Astrophysics and Space Science, vol. 212, nos. 1-2, p. 43-47
Astronomy and Astrophysics
Astrophysics
2
Particle Collisions, Planetary Evolution, Protoplanets, Solar System Evolution, Aggregates, Astronomical Models, Deposition, Granular Materials
Scientific paper
A mechanism of accumulation of grains in the primordial solar nebula is described. This process produces porous, low density compressible aggregates. Compaction of the aggregates in a collision between them dissipates the kinetic energy of the collision and can result in efficient growth. A simple analysis of such collisions is developed and applied over a range of aggregate sizes and relative velocities. The results indicate that large planetesimals could grow through collisions rather than fragment if the conditions are favorable. Our modeling suggests that primordial asteriods and comets on the order of a kilometer in size will have low densities and irregular shapes.
Donn Bertram
Duva Mark J.
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