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arXiv : astro-ph/9905162

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Astronomy and Astrophysics 351 (1999) L5-L9

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

B. Goldman, X. Delfosse, T. Forveille, E. Aubourg, P. Bareyre1, F. Bauer, J.P. Beaulieu, A. Bouquet1, S. Char, X. Charlot, F. Couchot, C. Coutures, F. Derue, R. Ferlet, P. Fouque, J.F. Glicenstein, A. Gould, D. Graff, M. Gros, J. Haissinski, J.C. Hamilton1, D. Hardin, J. De Kat, A. Kim1, T. Lasserre, E. Lesquoy, C. Loup, C. Magneville, B. Mansoux, J.B. Marquette, E.L. Martin, E. Maurice, A. Milsztajn, M. Moniez, N. Palanque-Delabrouille, O. Perdereau, L. prevot, N. Regnault, J. Rich, M. Spiro, A. Vidal-Madjar, L. Vigroux, S. Zylberajch, C. Afonso, C. Alard, J.N. Albert, J. Andersen, R. Ansari

EROS Collaboration(s)

(1999)

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.

1 :	PCC - Physique Corpusculaire et Cosmologie - Collège de France

Thème(s)

:

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

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Soumis le : Vendredi 17 Octobre 2003, 16:17:50

Dernière modification le : Vendredi 17 Octobre 2003, 16:17:50