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Issue A&A
Volume 427, Number 1, November III 2004
Page(s) L1 - L4
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200400069



A&A 427, L1-L4 (2004)
DOI: 10.1051/0004-6361:200400069

Letter

An L0 dwarf companion in the brown dwarf desert, at 30 AU

T. Forveille1, 2, D. Ségransan3, P. Delorme1, E. L. Martín4, X. Delfosse2, J. A. Acosta-Pulido4, J.-L. Beuzit2, A. Manchado4, M. Mayor3, C. Perrier2 and S. Udry2

1  Canada-France-Hawaii Telescope Corporation, PO Box 1597, Kamuela, HI 96743, USA
    e-mail: Thierry.Forveille@cfht.hawaii.edu
2  Laboratoire d'Astrophysique de Grenoble, BP 53, 38041 Grenoble Cedex, France
3  Observatoire de Genève, 51 chemin des Maillettes, 1290 Sauverny, Switzerland
4  Instituto de Astrofísica de Canarias, C/ Vía Láctea, s/n, 38200 La Laguna (Tenerife), Spain

(Received 22 June 2004 / Accepted 6 September 2004)

Abstract
We present the discovery of an L0 companion to the nearby M1.5 dwarf G 239-25, at a projected distance of 31 AU. It is the faintest companion discovered so far in our adaptive optics survey of all known M dwarfs within 12 pc, and it lies at the stellar/substellar limit. Given the assumed age of the primary star, the companion is likely an extremely low mass star. The long orbital period of G 239-25 AB ( $\approx$100 years) precludes a direct mass determination, but the relatively wide angular separation will allow detailed analyses of its near infrared and visible spectra.


Key words: very low mass stars -- brown dwarfs -- binary stars

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© ESO 2004


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