Other
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.0901s&link_type=abstract
American Astronomical Society Meeting 208, #9.01; Bulletin of the American Astronomical Society, Vol. 38, p.87
Other
Scientific paper
The formation of substellar objects via gravitational instability induced by protostellar disk encounters was investigated using a series of SPH simulations. A realistic model of the flared protostellar disk was adopted with a well-resolved Jeans mass following the density growth in the simulations. We found that fragmentation can be triggered in disks, tidal structures or shock layers during the encounters, controlled by the configuration, the disk stability parameter, Q, and the relative speed of the encounter. The fragments are in the mass range 2.0-73.0 Jupiter masses, most of which are in the brown dwarf category. The mass distribution is broadly consistent with the observed substellar initial mass function. The clumps have highly flattened disk-like shapes (R 0.3-18 AU) and possess large spin angular momentum, which implies that young brown dwarfs could develop disks, jets, or planetary mass companions. Dispersion of gas during the encounter and the high spin angular momentum of the clumps may provide mechanisms other than ejection to prevent the clumps from accreting any further mass, making the resultant clumps representative of the long term substellar mass function.
Shen Sijing
Wadsley James
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