Brown dwarf populations in open clusters

Abstract

We present the results of multiple simulations of open clusters, modelling the dynamics of a population of brown dwarf members. We consider the effects of a large range of primordial binary populations, including the possibilities of having brown dwarf members contained within a binary system. We also examine the effects of various cluster diameters and masses. Our examination of a population of wide binary systems containing brown dwarfs, reveals evidence for exchange reactions whereby the brown dwarf is ejected from the system and replaced by a heavier main-sequence star. We find that there exists the possibility of hiding a large fraction of the brown dwarfs contained within the primordial binary population. We conclude that it is probable that the majority of brown dwarfs are contained within primordial binary systems which then hides a large proportion of them from detection.

16 pages, 8 figures; to appear in MNRAS

References in corpus (2)

• Direct N-body Modelling of Stellar Populations: Blue Stragglers in M67
• Substellar Companions to Main Sequence Stars: No Brown Dwarf Desert at Wide Separations

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• A Constraint on brown dwarf formation via ejection: radial variation of the stellar and substellar mass function of the young open cluster IC2391
• Proper motions of field L and T dwarfs -II
• A deep multi-band investigation of IC2391
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• Two close binaries across the hydrogen-burning limit in the Praesepe open cluster