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EROS 2 proper motion survey: a field brown dwarf and an L dwarf companion to LHS 102

Abstract : We report the discovery of two L dwarfs (the new spectral class defined for dwarfs cooler than the M type) in a two-epoch CCD proper motion survey of 413 square degrees, complemented by infrared photometry from DENIS. One of them has a strong lithium line and is therefore a brown dwarf. The other is a common proper motion companion to the mid-M dwarf LHS 102 (GJ 1001), which has a well determined trigonometric parallax. LHS 102B is thus the coolest L dwarf of known distance and luminosity. Its infrared absolute photometry are very well reproduced by the Allard et al DUSTY models.
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Submitted on : Friday, October 17, 2003 - 4:17:50 PM
Last modification on : Wednesday, January 6, 2021 - 9:14:04 AM

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B. Goldman, X. Delfosse, T. Forveille, E. Aubourg, P. Bareyre, et al.. EROS 2 proper motion survey: a field brown dwarf and an L dwarf companion to LHS 102. Astronomy and Astrophysics - A&A, EDP Sciences, 1999, 351, pp.L5-L9. ⟨in2p3-00014069⟩

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