Some dynamical aspects of the accretion of Uranus and Neptune - The exchange of orbital angular momentum with planetesimals

Details Some dynamical aspects of the accretion of Uranus and Neptune - The exchange of orbital angular momentum with planetesimals Some dynamical aspects of the accretion of Uranus and Neptune - The exchange of orbital angular momentum with planetesimals

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984icar...58..109f&link_type=abstract

Icarus (ISSN 0019-1035), vol. 58, April 1984, p. 109-120.

Physics

214

Accretion Disks, Angular Momentum, Neptune (Planet), Planetary Evolution, Protoplanets, Solar Orbits, Uranus (Planet), Capture Effect, Celestial Mechanics, Momentum Transfer, Orbit Perturbation, Planetary Mass, Planets, Giant Planets, Dynamics, Accretion, Uranus, Neptune, Orbits, Angular Momentum, Planetesimals, Celestial Mechanics, Size, Mass, Cores, Physical Properties, Models, Formation, Protoplanets, Jupiter, Saturn, Comparisons, Gravity Effects, Injection, Time Scale, Gases, Atmosphere, Structure, Comp

Scientific paper

The final stage of the accretion of Uranus and Neptune is numerically investigated. The four Jovian planets are considered with Jupiter and Saturn assumed to have reached their present sizes, whereas Uranus and Neptune are taken with initial masses 0.2 of their present ones. Allowance is made for the orbital variation of the Jovian planets due to the exchange of angular momentum with interacting bodies ("planetesimals"). Significant radial displacements are found for Uranus and Neptune during their accretion and scattering of planetesimals. The orbital angular momentum budgets of Neptune, Uranus, and Saturn turn out to be positive; i.e., they on average gain orbital angular momentum in their interactions with planetesimals and hence they are displaced outwardly. Instead, Jupiter as the main ejector of bodies loses orbital angular momentum so it moves sunward. The gravitational stirring of planetesimals caused by the introduction of intermediate protoplanets has the effect that additional solid matter is injected into the accretion zones of Uranus and Neptune.

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