Bibcode
Forveille, T.; Ségransan, D.; Delorme, P.; Martín, E. L.; Delfosse, X.; Acosta-Pulido, J. A.; Beuzit, J.-L.; Manchado, A.; Mayor, M.; Perrier, C.; Udry, S.
Bibliographical reference
Astronomy and Astrophysics, v.427, p.L1-L4 (2004)
Advertised on:
11
2004
Journal
Citations
24
Refereed citations
23
Description
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 (≈100 years)
precludes a direct mass determination, but the relatively wide angular
separation will allow detailed analyses of its near infrared and visible
spectra.
Based on observations made at Canada-France-Hawaii Telescope, operated
by the National Council of Canada, the Centre National de la Recherche
Scientifique de France and the University of Hawaii, at the Observatoire
de Haute Provence, operated by the Centre National de la Recherche
Scientifique de France and at the William Herschel Telescopes operated
by the Isaac Newton Group at the Instituto de Astrofísica de
Canarias.