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Astron. Astrophys. 351, L5-L9 (1999)

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Letter to the Editor

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

The EROS collaboration
B. Goldman 1, X. Delfosse 2, T. Forveille 3, C. Afonso 1, C. Alard 4, J.N. Albert 5, J. Andersen 6, R. Ansari 5, É. Aubourg 1, P. Bareyre 1,7, F. Bauer 1, J.P. Beaulieu 8, J. Borsenberger **  8, A. Bouquet 7, S. Char, X. Charlot 1, F. Couchot 5, C. Coutures 1, F. Derue 5, R. Ferlet 8, P. Fouqué 9, J.F. Glicenstein 1, A. Gould 1,10, D. Graff 10, M. Gros 1, J. Haissinski 5, J.C. Hamilton 7, D. Hardin 1,11, J. de Kat 1, A. Kim 7, T. Lasserre 1, É. Lesquoy 1, C. Loup 8, C. Magneville 1, B. Mansoux 5, J.B. Marquette 8, E.L. Martín 12, É. Maurice 13, A. Milsztajn 1, M. Moniez 5, N. Palanque-Delabrouille 1, O. Perdereau 5, L. Prévot 13, N. Regnault 5, J. Rich 1, M. Spiro 1, A. Vidal-Madjar 8, L. Vigroux 1 and S. Zylberajch 1


1 CEA, DSM, DAPNIA, Centre d'Études de Saclay, 91191 Gif-sur-Yvette Cedex, France
2 Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Canary Islands, Spain
3 Observatoire de Grenoble, 414 rue de la Piscine, Domaine Universitaire de St Martin d'Hères, 38041 Grenoble, France
4 DASGAL, 77 avenue de l'Observatoire, 75014 Paris, France
5 Laboratoire de l'Accélérateur Linéaire, IN2P3 CNRS, Université Paris-Sud, 91405 Orsay Cedex, France
6 Astronomical Observatory, Copenhagen University, Juliane Maries Vej 30, 2100 Copenhagen, Denmark
7 Collège de France, Physique Corpusculaire et Cosmologie, IN2P3 CNRS, 11 pl. M. Berthelot, 75231 Paris Cedex, France
8 Institut d'Astrophysique de Paris, INSU CNRS, 98 bis Boulevard Arago, 75014 Paris, France
9 Observatoire de Meudon, 92195 Meudon Cedex, France
10 Departments of Astronomy and Physics, Ohio State University, Columbus, OH 43210, USA
11 LPNHE, IN2P3-CNRS-Universités Paris VI et VII, 4 place Jussieu, 75252 Paris Cedex 05, France
12 Astronomy department, University of California, Berkeley, CA 94720, USA
13 Observatoire de Marseille, 2 pl. Le Verrier, 13248 Marseille Cedex 04, France

Received 18 May 1999 / Accepted 11 October 1999

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, which for very cool dwarfs is a proof of brown dwarf status. 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 one of the coolest L dwarfs of known distance and luminosity.

Key words: Galaxy: kinematics and dynamics – cosmology: dark matter – stars: low-mass, brown dwarfs

* Based on observations made at the European Southern Observatory, La Silla, Chile.
** In fact, not an EROS member.

Send offprint requests to: Bertrand.Goldman@cea.fr

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© European Southern Observatory (ESO) 1999

Online publication: November 2, 1999
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