The formation of Uranus and Neptune among Jupiter and Saturn

Details The formation of Uranus and Neptune among Jupiter and Saturn The formation of Uranus and Neptune among Jupiter and Saturn

2001-11-14

arxiv.org/abs/astro-ph/0111290v1

Astron.J. 123 (2002) 2862

Astronomy and Astrophysics

Astrophysics

Submitted to AJ; 38 pages, 16 figures

Scientific paper

10.1086/339975

The outer giant planets, Uranus and Neptune, pose a challenge to theories of planet formation. They exist in a region of the Solar System where long dynamical timescales and a low primordial density of material would have conspired to make the formation of such large bodies ($\sim$ 15 and 17 times as massive as the Earth, respectively) very difficult. Previously, we proposed a model which addresses this problem: Instead of forming in the trans-Saturnian region, Uranus and Neptune underwent most of their growth among proto-Jupiter and -Saturn, were scattered outward when Jupiter acquired its massive gas envelope, and subsequently evolved toward their present orbits. We present the results of additional numerical simulations, which further demonstrate that the model readily produces analogues to our Solar System for a wide range of initial conditions. We also find that this mechanism may partly account for the high orbital inclinations observed in the Kuiper belt.

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