The formation of brown dwarfs

Details The formation of brown dwarfs The formation of brown dwarfs

2005-12-16

arxiv.org/abs/astro-ph/0512436v1

Astronomy and Astrophysics

Astrophysics

7 pages, 1 figure. To appear in Astron.Nachrichten. Includes an.cls file

Scientific paper

10.1002/asna.200510447

We review four mechanisms for forming brown dwarfs: (i) turbulent fragmentation (producing very low-mass prestellar cores); (ii) gravitational instabilities in discs; (iii) dynamical ejection of stellar embryos from their placental cores; and (iv) photo-erosion of pre-existing cores in HII regions. We argue (a) that these are simply the mechanisms of low-mass star formation, and (b) that they are not mutually exclusive. If, as seems possible, all four mechanisms operate in nature, their relative importance may eventually be constrained by their ability to reproduce the binary statistics of brown dwarfs, but this will require fully 3-D radiative magneto-hydrodynamic simulations.

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