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

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

1999-05-13

arxiv.org/abs/astro-ph/9905162v2

Astron.Astrophys.351:L5-L9,1999

Astronomy and Astrophysics

Astrophysics

5 pages, LaTeX, 6 postscript figures, style correction, two spectra of the discovered objects added, coordinates of the LHS102

Scientific paper

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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