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

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...

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Veröffentlicht in:	Astronomy and astrophysics (Berlin) 1999, Vol.351, p.L5-L9
Hauptverfasser:	Goldman, B., Delfosse, X., Forveille, T., Aubourg, E., Bareyre, P., Bauer, F., Beaulieu, J.P., Bouquet, A., Char, S., Charlot, X., Couchot, F., Coutures, C., Derue, F., Ferlet, R., Fouque, P., Glicenstein, J.F., Gould, A., Graff, D., Gros, M., Haissinski, J., Hamilton, J.C., Hardin, D., de Kat, J., Kim, A., Lasserre, T., Lesquoy, E., Loup, C., Magneville, C., Mansoux, B., Marquette, J.B., Martin, E.L., Maurice, E., Milsztajn, A., Moniez, M., Palanque-Delabrouille, N., Perdereau, O., Prevot, L., Regnault, N., Rich, J., Spiro, M., Vidal-Madjar, A., Vigroux, L., Zylberajch, S., Afonso, C., Alard, C., Albert, J.N., Andersen, J., Ansari, R.
Format:	Artikel
Sprache:	eng
Schlagworte:	Astrophysics Cosmology and Extra-Galactic Astrophysics Physics
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Zusammenfassung:	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.
ISSN:	0004-6361 1432-0756