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

被引：25
|
作者：
Forveille, T
Ségransan, D
Delorme, P
Martín, EL
Delfosse, X
Acosta-Pulido, JA
Beuzit, JL
Manchado, A
Mayor, M
Perrier, C
Udry, S
机构：
[1] Canada France Hawaii Telescope Corp, Kamuela, HI 96743 USA
[2] Lab Astrophys Grenoble, F-38041 Grenoble, France
[3] Observ Geneva, CH-1290 Sauverny, Switzerland
[4] Inst Astrofis Canarias, Tenerife 38200, Spain
来源：
ASTRONOMY & ASTROPHYSICS | 2004年 / 427卷 / 01期
关键词：
very low mass stars; brown dwarfs; binary stars;
D O I：
10.1051/0004-6361:200400069
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 (approximate to 100 years) precludes a direct mass determination, but the relatively wide angular separation will allow detailed analyses of its near infrared and visible spectra.
引用
收藏
页码：L1 / L4
页数：4
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