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

B. Goldman·X. Delfosse·T. Forveille·C. Afonso et al·:·the EROS collaboration
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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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B. Goldman, X. Delfosse, T. Forveille, C. Afonso et al, :, the EROS collaboration. 2000-08-24. EROS 2 proper motion survey: a field brown dwarf and an L dwarf companion to LHS 102. https://arxiv.org/abs/astro-ph/9905162

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