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

页码：L1 / L4

页数：4

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