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Dynamical mass of GJ 802b: A brown dwarf in a triple system

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Date

2008

Authors

Kraus, A
Martinache, F
Lloyd, J P
Tuthill, Peter G
Ireland, Michael

Journal Title

Journal ISSN

Volume Title

Publisher

IOP Publishing

Abstract

We report a dynamical measurement of the mass of the brown dwarf GJ 802B using aperture-masking interferometry and astrometry. In addition, we report the discovery that GJ 802A is itself a close spectroscopic noneclipsing binary with a 19 hr period. We find the mass of GJ 802B to be 0.063 ±0.005 M⊙. GJ 802 has kinematics inconsistent with a young star and more consistent with the thick-disk population, implying a system age of ∼10 Gyr. However, model evolutionary tracks for GJ 802B predict system ages of ∼2 Gyr, suggesting that brown dwarf evolutionary models may be underestimating luminosity for old brown dwarfs.

Description

Keywords

Keywords: Brown dwarfs; Stars: low-mass

Citation

URI

http://hdl.handle.net/1885/67087

Collections

ANU Research Publications

Source

Astrophysical Journal, The

Type

Journal article

Book Title

Entity type

Access Statement

License Rights

DOI

10.1086/529578

Restricted until

2037-12-31

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