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A Search for Companions to L Dwarfs

Published online by Cambridge University Press:  26 May 2016

P. R. Allen ,
D. W. Koerner ,
M. W. McElwain ,
G. R. Murphy ,
I. Neill Reid ,
J. E. Gizis  and
J. Davy Kirkpatrick
P. R. Allen
Affiliation:
University of Pennsylvania, 209 S. 33rd St., Philadelphia, PA 19104
D. W. Koerner
Affiliation:
University of Pennsylvania, 209 S. 33rd St., Philadelphia, PA 19104
M. W. McElwain
Affiliation:
University of Pennsylvania, 209 S. 33rd St., Philadelphia, PA 19104
G. R. Murphy
Affiliation:
University of Pennsylvania, 209 S. 33rd St., Philadelphia, PA 19104
I. Neill Reid
Affiliation:
(STScI) (Univ. of Delaware) (IPAC)
J. E. Gizis
Affiliation:
(STScI) (Univ. of Delaware) (IPAC)
J. Davy Kirkpatrick
Affiliation:
(STScI) (Univ. of Delaware) (IPAC)

Abstract

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We present the results of two imaging surveys for companions to low-luminosity dwarfs, one with Keck to a limiting magnitude of K = 20, and the other with HST to a limiting magnitude of I = 23. No companions were found at separations of 0″.5 to 20″.0, but seven companions were found within 0″.5. Based on sub-stellar evolutionary models, we estimate the companion detection efficiency as a function of mass ratio. This modeling, coupled with the data, place strong upper limits on the mass ratios of unobserved companions. We conclude that no companions exist in the optimal sensitivity regions of both surveys for q > 0.85 (HST), and q > 0.4 (Keck).

Type
Part 6. Searches for Substellar Companions
Information
Symposium - International Astronomical Union , Volume 211: Brown Dwarfs , 2003 , pp. 303 - 304
Copyright
Copyright © Astronomical Society of the Pacific 2001 

References

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