Accumulation of a swarm of small planetesimals

Details Accumulation of a swarm of small planetesimals Accumulation of a swarm of small planetesimals

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989icar...77..330w&link_type=abstract

Icarus (ISSN 0019-1035), vol. 77, Feb. 1989, pt. 1, p. 330-357.

Physics

274

Planetary Evolution, Protoplanets, Fokker-Planck Equation, Inelastic Collisions, Velocity Distribution, Planets, Planetesimals, Dynamics, Formation, Parameters, Time Scale, Terrestrial Planets, Evolution, Accretion, Hypotheses, Calculations, Procedure, Mass, Distribution, Fragmentation, Models, Distance

Scientific paper

The present gasdynamic study of the planetesimal-accumulation stage in which 10-km bodies in the neighborhood of 1 AU grow to 10 to the 25th-10 to the 27th g mass, or 'planetary embryo' size, attempts to identify the circumstances under which runaway growth forms a small number of massive embryos in the terrestrial-planet region on a 0.1-1.0 million year time-scale. No runaways are found, however, unless more plausible physical processes are invoked; in that case, runaways in the terrestrial planet region are probable on a 0.1 million-year time-scale, and the final stage of planetary accumulation may involve the growth of these embryos into the present planets on a 10-100 million-year time-scale.

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