Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997seti.rept.....h&link_type=abstract
Technical Report, NASA/CR-97-112546; NAS 1.26:112546
Astronomy and Astrophysics
Astronomy
Astronomical Models, Protoplanets, Planetary Evolution, Gas Giant Planets, Computerized Simulation, Planetary Systems, Planetary Structure, Planetary Mass, Planetary Composition, Accretion Disks, Gases, Solids
Scientific paper
Models were developed to simulate planet formation. Three major phases are characterized in the simulations: (1) planetesimal accretion rate, which dominates that of gas, rapidly increases owing to runaway accretion, then decreases as the planet's feeding zone is depleted; (2) occurs when both solid and gas accretion rates are small and nearly independent of time; and (3) starts when the solid and gas masses are about equal and is marked by runaway gas accretion. The models applicability to planets in our Solar System are judged using two basic "yardsticks". The results suggest that the solar nebula dissipated while Uranus and Neptune were in the second phase, during which, for a relatively long time, the masses of their gaseous envelopes were small but not negligible compared to the total masses. Background information, results and a published article are included in the report.
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