Other
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998lpico.957...21k&link_type=abstract
Origin of the Earth and Moon, Proceedings of the Conference held 1-3 December, 1998 in Monterey, California. LPI Contribution N
Other
Gas Giant Planets, Gravitational Effects, Planetary Evolution, Planetary Nebulae, Protoplanets, Solar System Evolution, Planetary Orbits, Extrasolar Planets, Many Body Problem, Models
Scientific paper
Recent discoveries of possible extrasolar giant planets orbiting very close to their central stars have revived discussion about the origin and evolution of Jupiter and Saturn. One scenario, recently revived by Boss, is that Jupiter and Saturn formed from gravitational instabilities in the cool outer regions of the early solar nebula Formation timescales for this process are about 100 yr, with the giant planets forming toward the end of the accretion of the Sun itself and quite possibly prior to a quiescent stage of disk evolution during which planetesimal formation is usually considered to occur. Gravitational interactions between the massive planets and the even more massive gaseous disk then cause the planets to migrate toward the Sun, presumably giving rise to the small orbits of the known extrasolar giant planets. Boss's disk models have led him to entertain the notion of a "best of both worlds" scenario for planet formation, wherein Jupiter and Saturn formed from GGPPs in the cool outer disk and the terrestrial planets formed in the hot inner disk by the conventional method of collisional accumulation of small planetesimals. If this is the case, then formation of terrestrial planets and asteroids and formation of gas giants, which have traditionally been modeled as separate processes, may have occurred simultaneously and thus affected each other. Here we address a variation of the standard model of terrestrial planet and asteroid formation. Specifically, we investigate whether th eearly formation fo Jupiter and Saturn would help or hinder formation of terrestrial planetary embryos in the inner solar system.
Kortenkamp Stephen J.
Wetherill George W.
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