A near-infrared, wide-field, proper-motion search for brown dwarfs

被引：27
|
作者：
Hinz, JL
McCarthy, DW
Simons, DA
Henry, TJ
Kirkpatrick, JD
McGuire, PC
机构：
[1] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA
[2] Gemini Observ, No Operat Ctr, Hilo, HI 96720 USA
[3] Georgia State Univ, Dept Phys & Astron, Atlanta, GA 30303 USA
[4] CALTECH, Ctr Infrared Proc & Anal, Pasadena, CA 91125 USA
[5] Univ Bielefeld, D-33615 Bielefeld, Germany
来源：
ASTRONOMICAL JOURNAL | 2002年 / 123卷 / 04期
关键词：
stars : imaging; stars; low-mass; brown dwarfs; stars : statistics;
D O I：
10.1086/339555
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
A common proper-motion survey of M dwarf stars within 8 pc of the Sun reveals no new stellar or brown dwarf companions at wide separations (similar to100-1400 AU). This survey tests whether the brown dwarf desert extends to large separations around M dwarf stars and further explores the census of the solar neighborhood. The sample includes 66 stars north of -30degrees and within 8 pc of the Sun. Existing first-epoch images are compared with new J-band images of the same fields an average of 7 yr later to reveal proper-motion companions within a similar to4' radius of the primary star. No new companions are detected to a J-band limiting magnitude of similar to16.5, corresponding to a companion mass of similar to40 Jupiter masses for an assumed age of 5 Gyr at the mean distance of the objects in the survey, 5.8 pc.
引用
收藏
页码：2027 / 2032
页数：6
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