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Title:
Encounters with Protostellar Disks. II. Disruption and Binary Formation
Authors:
Heller, Clayton H.
Publication:
Astrophysical Journal v.455, p.252 (ApJ Homepage)
Publication Date:
12/1995
Origin:
APJ; KNUDSEN
Astronomy Keywords:
STARS: BINARIES: GENERAL, CELESTIAL MECHANICS, STELLAR DYNAMICS, STARS: CIRCUMSTELLAR MATTER, STARS: FORMATION
DOI:
10.1086/176573
Bibliographic Code:
1995ApJ...455..252H

Abstract

The disruption of a circumstellar disk during a stellar encounter and the accompanying dissipation of orbital energy are numerically simulated. It is found that an average impacting encounter produces a mass loss of less than about half of the initial disk mass. Even in dense stellar environments encounters are unlikely to play a prominent role in dispersing disks, though densities in the outer parts can be significantly reduced. A large fraction of the disk material may be captured by the perturber or ejected from the system. No material is found to form a circumbinary disk.

Though the planar retrograde encounters are found to be particularly efficient at dissipating orbital energy, estimated rates indicate that capture is not a dominant process for the formation of binaries in stellar clusters. However, the rates may be greatly underestimated if substructure exists or interactions occur during the star-formation process.

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