A candidate substellar companion to CD -33°7795 (TWA 5)

被引：128

作者：

Lowrance, PJ ^{[1
]}

McCarthy, C

Becklin, EE

Zuckerman, B

Schneider, G

Webb, RA

Hines, DC

Kirkpatrick, JD

Koerner, DW

Low, F

Meier, R

Rieke, M

Smith, BA

Terrile, RJ

Thompson, RI

机构：

[1] Univ Calif Los Angeles, Los Angeles, CA 90024 USA

[2] Univ Arizona, Tucson, AZ USA

[3] CALTECH, Ctr Infrared Proc & Anal, Pasadena, CA 91125 USA

[4] Univ Penn, Philadelphia, PA 19104 USA

[5] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[6] CALTECH, Jet Prop Lab, Pasadena, CA USA

来源：

ASTROPHYSICAL JOURNAL | 1999年 / 512卷 / 01期

基金：

美国国家航空航天局;

关键词：

stars; low-mass; brown dwarfs;

D O I：

10.1086/311858

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the discovery of a candidate substellar object in a survey of young stars in the solar vicinity using the sensitivity and spatial resolution afforded by the NICMOS coronagraph on the Hubble Space Telescope. The H = 12.1 mag object was discovered approximately 2" from the TW Hydrae association member CD -33 degrees 7795 (TWA 5), and the photometry implies a spectral type M8-M8.5, with a temperature of similar to 2600 K. We estimate that the probability of a chance alignment with a background object of this nature is less than 2 x 10(-5) and therefore postulate that the object (TWA 5B) is physically associated at a projected separation of 100 AU, Given the likely youth of the primary (similar to 10 Myr), current brown dwarf cooling models predict a mass of approximate to 20M(Jup) for TWA 5B.

引用

页码：L69 / L72

页数：4