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?

引用

页码：L29 / L32

页数：4

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