Implications of a scattered Uranus and Neptune

Details Implications of a scattered Uranus and Neptune Implications of a scattered Uranus and Neptune

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000dda....31.0111t&link_type=abstract

American Astronomical Society, DDA Meeting #31, #01.11; Bulletin of the American Astronomical Society, Vol. 32, p.858

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It has been proposed that Uranus and Neptune originated interior to 10 AU, as potential gas giant cores which were scattered outward when Jupiter won the race to reach runaway gas accretion (Thommes, Duncan and Levison, Nature 402, 1999). We report on further investigations into various aspects of this model. The dependence of the final locations of the giant planets on the heliocentric distance at which Jupiter undergoes runaway gas accretion is examined. Also, we find that the appearance of the inner Solar System can be significantly affected by both Jupiter and Saturn's range of migration to their final positions, since this determines the distances through which their resonances sweep. Another effect our simulations show is that cores tend to briefly penetrate the region of the outer asteroid belt in the process of getting scattered. In the majority of cases, the crossing duration is only a few 103 years, so that there is only modest excitation and depletion of the belt. However, in some circumstances, it is possible for a giant planet core to be deposited in a stable orbit interior to Jupiter. Conceivably, such an occurrence could have played a role in the formation of some of the discovered extrasolar systems.

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