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
相关论文
共 34 条
  • [1] Acosta Pulido J.A., 2003, NEWSLETTER I NEWTON, V7, P15
  • [2] Baraffe I, 1998, ASTRON ASTROPHYS, V337, P403
  • [3] ELODIE: A spectrograph for accurate radial velocity measurements
    Baranne, A
    Queloz, D
    Mayor, M
    Adrianzyk, G
    Knispel, G
    Kohler, D
    Lacroix, D
    Meunier, JP
    Rimbaud, G
    Vin, A
    [J]. ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, 1996, 119 (02): : 373 - 390
  • [4] New neighbours -: III.: 21 new companions to nearby dwarfs, discovered with adaptive optics
    Beuzit, JL
    Ségransan, D
    Forveille, T
    Udry, S
    Delfosse, X
    Mayor, M
    Perrier, C
    Hainaut, MC
    Roddier, C
    Roddier, F
    Martín, EL
    [J]. ASTRONOMY & ASTROPHYSICS, 2004, 425 (03) : 997 - 1008
  • [5] Bouvier J, 1998, ASTRON ASTROPHYS, V336, P490
  • [6] Multiplicity of nearby free-floating ultracool dwarfs:: A Hubble Space Telescope WFPC2 search for companions
    Bouy, H
    Brandner, W
    Martín, EL
    Delfosse, X
    Allard, F
    Basri, G
    [J]. ASTRONOMICAL JOURNAL, 2003, 126 (03) : 1526 - 1554
  • [7] Evolutionary models for very low-mass stars and brown dwarfs with dusty atmospheres
    Chabrier, G
    Baraffe, I
    Allard, F
    Hauschildt, P
    [J]. ASTROPHYSICAL JOURNAL, 2000, 542 (01) : 464 - 472
  • [8] Galactic stellar and substellar initial mass function
    Chabrier, G
    [J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 2003, 115 (809) : 763 - 795
  • [9] Detection of nine M8.0-L0.5 binaries: The very low mass binary population and its implications for brown dwarf and very low mass star formation
    Close, LM
    Siegler, N
    Freed, M
    Biller, B
    [J]. ASTROPHYSICAL JOURNAL, 2003, 587 (01) : 407 - 422
  • [10] Delfosse X, 2000, ASTRON ASTROPHYS, V364, P217
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