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Discovery of a Tight Brown Dwarf Companion to the Low Mass Star LHS 2397a

Published online by Cambridge University Press:  26 May 2016

Melanie Freed
Affiliation:
Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson AZ, USA 85721–0065; mfreed@as.arizona.edu
Laird M. Close
Affiliation:
Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson AZ, USA 85721–0065; mfreed@as.arizona.edu
Nick Siegler
Affiliation:
Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson AZ, USA 85721–0065; mfreed@as.arizona.edu
Corresponding
E-mail address:

Abstract

Using the adaptive optics system, Hōkūpa'a, at Gemini-North, we have directly imaged a companion around the UKIRT faint standard M8 star, LHS 2397a (FS 129) at a separation of 2.96 AU. Near-Infrared photometry obtained on the companion has shown it to be an L7.5 brown dwarf and confirmed the spectral type of the primary to be an M8. We also derive a substellar mass of the companion of 0.068M , although masses in the range (0.061 – 0.069) are possible, and the primary mass as 0.090M (0.089 – 0.094). Reanalysis of archival imaging from HST has confirmed the secondary as a common proper motion object. This binary represents the first clear example of a brown dwarf companion within 4 AU of a low mass star, and should be the first L7.5 to have a dynamical mass. As part of a larger survey of M8-M9 stars, this object may indicate that there is no “brown dwarf desert” around low mass primaries.

Type
Part 6. Searches for Substellar Companions
Copyright
Copyright © Astronomical Society of the Pacific 2001 

References

Chabrier, G., Baraffe, I., Allard, F., & Hauschildt, P. 2000, ApJ, 542, 464 CrossRefGoogle Scholar
Dahn, C.C., et al. 2002, AJ, in press (astro-ph/0205050) Google Scholar
Freed, M., Close, L.M., & Siegler, N. 2002, submitted ApJ Google Scholar
Kirkpatrick, J.D., & Henry, T.J. 1997, HST Proposal 6345 Google Scholar
Marcy, G.W., & Butler, R.P. 2000, PASP, 112, 137 CrossRefGoogle Scholar
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