Numerical Results on Low Mass Star and Brown Dwarf Multiplicity

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Proceedings for the Volterra 2004 meeting on "Low Mass Stars and Brown Dwarfs: IMF, Accretion and Activity", 6 pages, 4 figure

Scientific paper

We have undertaken a series of hydrodynamic + N-body simulations in order to explore the properties of young stars. Our results suggest that the IMF may be sensitive to environment in its substellar region, with more brown dwarfs being formed where clusters are denser or more compact. We find that multiple stars are a natural outcome of collapsing turbulent flows, with a high incidence of N > 2 multiples. We find a positive correlation of multiplicity with primary mass but a companion frequency that decreases with age. Binary brown dwarfs are rarely formed, in conflict with observations. Brown dwarfs as companions are predominantly found orbiting binaries or triples at large separations.

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