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Peter R. Allen et al. 2007 The Astronomical Journal 133 971 doi:10.1086/510346

A New Brown Dwarf Desert? A Scarcity of Wide Ultracool Binaries

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Peter R. Allen1, David W. Koerner2, Michael W. McElwain3, Kelle L. Cruz4 and I. Neill Reid5

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Abstract References Cited By

We present the results of a deep-imaging search for wide companions to low-mass stars and brown dwarfs using NSFCam on the Infrared Telescope Facility. We searched a sample of 132 M7-L8 dwarfs to magnitude limits of J ~ 20.5 and K ~ 18.5, corresponding to secondary-to-primary mass ratios of ~0.5. No companions were found with separations between 2'' and 31'' (~40 to ~1000 AU). This null result implies a wide companion frequency below 2.3% at the 95% confidence level within the sensitivity limits of the survey. Preliminary modeling efforts indicate that we could have detected 85% of companions more massive than 0.05 Modot and 50% above 0.03 Modot.


Keywords

binaries: general; stars: low-mass, brown dwarfs


Dates

Issue 3 (2007 March)

Received 2005 July 20, accepted for publication 2006 October 16

Published 2007 January 31



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