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Record Details

Record 53 of 9455
Type II Migration and Giant Planet Survival
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Author and Affiliation:
Ward, William R.(Southwest Research Inst., Dept. of Space Studies, Boulder, CO, United States)
Abstract: Type II migration, in which a newly formed large planet opens a gap in its precursor circumstellar nebula and subsequently evolves with it, has been implicated as a delivery mechanism responsible for close stellar companions. Large scale migration is possible in a viscously spreading disk of surface density sigma (r,t) when most of it is sacrificed to the primary in order to promote a small portion of the disk to much higher angular momentum orbits. Embedded planets generally follow its evolution unless their own angular momentum is comparable to that of the disk. The fraction of the starting disk mass, M (sub d) = 2pi integral rsigma(r,0)dr, that is consumed by the star depends on the distance at which material escapes the disk's outer boundary. If the disk is allowed to expand indefinitely, virtually all of the disk will fall into the primary in order to send a vanishingly small portion to infinity. For such a case, it is difficult to explain the survival of any giant planets, including Jupiter and Saturn. Realistically, however, there are processes that could truncate a disk at a finite distance, r(sub d). Recent numerical modeling has illustrated that planets can survive in this case. We show here that much of these results can be understood by simple conservation arguments.
Publication Date: Jan 01, 2003
Document ID:
20030110857
(Acquired Dec 13, 2003)
Subject Category: LUNAR AND PLANETARY SCIENCE AND EXPLORATION
Document Type: Conference Paper
Publication Information: Lunar and Planetary Science XXXIV; (LPI-Contrib-1156); (SEE 20030110578)
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Organization Source: Southwest Research Inst.; Dept. of Space Studies; Boulder, CO, United States
Description: 2p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution under U.S. Government purpose rights; under cooperative agreement NCC5-679
NASA Terms: GAS GIANT PLANETS; MIGRATION; MATHEMATICAL MODELS; PROTOPLANETARY DISKS; ANGULAR MOMENTUM; SATURN (PLANET); JUPITER (PLANET); NEBULAE; STELLAR MASS; STELLAR ENVELOPES
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