Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974icar...22..426w&link_type=abstract
Icarus, vol. 22, Aug. 1974, p. 426-435.
Astronomy and Astrophysics
Astronomy
12
Astronomical Models, Earth (Planet), Gravitational Effects, Planetary Evolution, Mars (Planet), Mass Transfer, Particle Motion, Planetary Structure, Temperature Effects, Velocity Distribution, Venus (Planet)
Scientific paper
One possible origin of the terrestrial planets involves their formation by gravitational accretion of particles originally in Keplerian orbits about the sun. Some implications of this theory are considered. A formal expression for the rate of mass accretion by a planet is developed. The formal singularity of the gravitational collision cross section for low relative velocities is shown to be without physical significance when the accreting bodies are in heliocentric orbits. The distribution of particle velocities relative to an accreting planet is considered; the mean velocity increases with time. The internal temperature of an accreting planet is shown to depend simply on the accretion rate. A simple and physically reasonable approximate expression for a planetary accretion rate is proposed.
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