How do brown dwarves form?

Details How do brown dwarves form? How do brown dwarves form?

2005-01-04

arxiv.org/abs/astro-ph/0501049v1

Astronomy and Astrophysics

Astrophysics

To appear in the proceedings of "Low Mass Stars and Brown Dwarfs: IMF, Accretion and Activity" (Volterra, 2004). 6 pages, 1 fi

Scientific paper

We review and evaluate four mechanisms for forming brown dwarves: (i) dynamical ejection of a stellar embryo from its placental prestellar core; (ii) opacity-limited fragmentation of a shock-compressed layer; (iii) gravitational instabilities in discs, triggered by impulsive interactions with other discs or naked stars; and (iv) photo-erosion of pre-existing cores. All these mechanisms can produce free-floating brown dwarves, but only (ii) and (iii) are likely to produce brown dwarves in multiple systems, and (i) has difficulty delivering brown dwarves with discs.

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