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28 March 2024
 
  » arxiv » astro-ph/0103219

 Article overview


Substellar Companions to Main Sequence Stars: No Brown Dwarf Desert at Wide Separations
John E. Gizis ; J. Davy Kirkpatrick ; Adam Burgasser ; I. Neill Reid ; David G. Monet ; James Liebert ; John C. Wilson ;
Date 14 Mar 2001
Subject astro-ph
AffiliationCaltech/IPAC, Caltech, U.Penn/STScI, USNO/Flagstaff, U.Arizona, Cornell
AbstractWe use three field L and T dwarfs which were discovered to be wide companions to known stars by the Two Micron All-Sky Survey (2MASS) to derive a preliminary brown dwarf companion frequency. Observed L and T dwarfs indicate that brown dwarfs are not unusually rare as wide (Delta >1000 A.U.) systems to F-M0 main-sequence stars (M>0.5M_sun, M_V<9.5), even though they are rare at close separation (Delta <3 A.U.), the ``brown dwarf desert.’’ Stellar companions in these separation ranges are equally frequent, but brown dwarfs are >~ 10 times as frequent for wide than close separations. A brown dwarf wide-companion frequency as low as the 0.5% seen in the brown dwarf desert is ruled out by currently-available observations.
Source arXiv, astro-ph/0103219
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