A companion to AB Pic at the planet/brown dwarf boundary

被引：214
作者：
Chauvin, G
Lagrange, AM
Zuckerman, B
Dumas, C
Mouillet, D
Song, I
Beuzit, JL
Lowrance, P
Bessell, MS
机构：
[1] European So Observ, Santiago 19, Chile
[2] Observ Grenoble, Astrophys Lab, St Martin Dheres, France
[3] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
[4] Univ Calif Los Angeles, Ctr Astrobiol, Los Angeles, CA 90095 USA
[5] Observ Midi Pyrenees, Astrophys Lab, Tarbes, France
[6] Spitzer Sci Ctr, Infrared Proc & Anal Ctr, Pasadena, CA 91125 USA
[7] Australian Natl Univ, Res Sch Astron & Astrophys, Inst Adv Studies, Weston, ACT 2611, Australia
来源：
ASTRONOMY & ASTROPHYSICS | 2005年 / 438卷 / 03期
关键词：
D O I：
10.1051/0004-6361:200500111
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report deep imaging observations of the young, nearby star AB Pic, a member of the large Tucana-Horologium association. We have detected a faint, red source 5.5 '' South of the star with JHK colors compatible with that of a young substellar L dwarf. Follow-up observations at two additional epochs confirm, with a confidence level of 4.7 sigma, that the faint, red object is a companion to AB Pic rather than it being a stationary background object. A low resolution K-band spectrum indicates an early-L spectral type for the companion. Finally, evolutionary model predictions based on the JHK photometry of AB Pic b indicate a mass of 13 to 14 M-Jup if its age is similar to 30 Myr. Is AB Pic b a massive planet or a minimum mass brown dwarf?
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页码：L29 / L32
页数：4
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