期刊
ICARUS
卷 207, 期 2, 页码 509-516出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.icarus.2010.01.015
关键词
Disks; Planetary formation; Planets, Migration; Planetesimals
资金
- University of Zurich
- SNF
- University of Florida
- ETH
- NASA [NNX08AK36G]
- NASA [NNX08AK36G, 100052] Funding Source: Federal RePORTER
We explore the initial conditions for fragments in the extended regions (r greater than or similar to 50 AU) of gravitationally unstable disks. We combine analytic estimates for the fragmentation of spiral arms with 3D SPH simulations to show that initial fragment masses are in the gas giant regime. These initial fragments will have substantial angular momentum, and should form disks with radii of a few AU. We show that clumps will survive for multiple orbits before they undergo a second, rapid collapse due to H(2) dissociation and that it is possible to destroy bound clumps by transporting them into the inner disk. The consequences of disrupted clumps for planet formation, dust processing, and disk evolution are discussed. We argue that it is possible to produce Earth-mass cores in the outer disk during the earliest phases of disk evolution. (C) 2010 Elsevier Inc. All rights reserved.
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