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The formation of brown dwarfs: theory

Whitworth, Anthony Peter, Bate, Matthew R., Nordlund, Ake, Reipurth, Bo and Zinnecker, Hans 2007. The formation of brown dwarfs: theory. Presented at: Protostars and Planets V, Hawaii, USA, October 24 - 28 2005. Published in: Reipurth, Bo, Jewitt, David and Keil, Klaus eds. Tuscon: University of Arizona Press, pp. 459-476.

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Abstract

We review five mechanisms for forming brown dwarfs: (1) turbulent fragmentation of molecular clouds, producing very-low-mass prestellar cores by shock compression; (2) collapse and fragmentation of more massive prestellar cores; (3) disk fragmentation; (4) premature ejection of protostellar embryos from their natal cores; and (5) photoerosion of pre-existing cores overrun by Hii regions. These mechanisms are not mutually exclusive. Their relative importance probably depends on environment, and should be judged by their ability to reproduce the brown dwarf IMF, the distribution and kinematics of newly formed brown dwarfs, the binary statistics of brown dwarfs, the ability of brown dwarfs to retain disks, and hence their ability to sustain accretion and outflows. This will require more sophisticated numerical modeling than is presently possible, in particular more realistic initial conditions and more realistic treatments of radiation transport, angular momentum transport, and magnetic fields. We discuss the minimum mass for brown dwarfs, and how brown dwarfs should be distinguished from planets

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: University of Arizona Press
ISBN: 9780816526543
Last Modified: 04 Jun 2017 07:49
URI: http://orca.cf.ac.uk/id/eprint/68377

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