Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-06-20
Mon.Not.Roy.Astron.Soc. 332 (2002) L65
Astronomy and Astrophysics
Astrophysics
5 pages, 2 GIF figures, postscript with figures available at http://www.astro.ex.ac.uk/people/mbate
Scientific paper
10.1046/j.1365-8711.2002.05539.x
We present results from the first hydrodynamical star formation calculation to demonstrate that brown dwarfs are a natural and frequent product of the collapse and fragmentation of a turbulent molecular cloud. The brown dwarfs form via the fragmentation of dense molecular gas in unstable multiple systems and are ejected from the dense gas before they have been able to accrete to stellar masses. Thus, they can be viewed as `failed stars'. Approximately three quarters of the brown dwarfs form in gravitationally-unstable circumstellar discs while the remainder form in collapsing filaments of molecular gas. These formation mechanisms are very efficient, producing roughly the same number of brown dwarfs as stars, in agreement with recent observations. However, because close dynamical interactions are involved in their formation, we find a very low frequency of binary brown dwarf systems ($\lsim 5$%) and that those binary brown dwarf systems that do exist must be close $\lsim 10$ AU. Similarly, we find that young brown dwarfs with large circumstellar discs (radii $\gsim 10$ AU) are rare ($\approx 5$%).
Bate Matthew R.
Bonnell Ian A.
Bromm Volker
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