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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 | Affiliation: | Caltech/IPAC, Caltech, U.Penn/STScI, USNO/Flagstaff, U.Arizona, Cornell | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
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