Direct Detection of the Brown Dwarf GJ 802B with Adaptive Optics Masking Interferometry

Creators: Lloyd, James P.; Martinache, Frantz; Ireland, Michael J.; Monnier, John D.; Pravdo, Steven H.; Shaklan, Stuart B.; Tuthill, Peter G.

Abstract

We have used the Palomar 200" adaptive optics (AO) system to directly detect the astrometric brown dwarf GJ 802B reported by Pravdo et al. This observation is achieved with a novel combination of aperture masking interferometry and AO. The dynamical masses are 0.175 ± 0.021 and 0.064 ± 0.032 M_⊙ for the primary and secondary, respectively. The inferred absolute H-band magnitude of GJ 802B is M_H = 12.8 resulting in a model-dependent T_(eff) of 1850 ± 50 K and mass range of 0.057-0.074 M_⊙.

Additional Information

© 2006 The American Astronomical Society. Received 2006 July 17; accepted 2006 August 31; published 2006 October 10. We thank Rick Burruss, Jeff Hickey, and the Palomar observatory staff for help with these observations. This work is partially funded by the National Science Foundation under grants AST 03-35695 and AST 05-06588. The research described in this Letter was performed in part by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation.

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