A DISTANCE-LIMITED IMAGING SURVEY OF SUBSTELLAR COMPANIONS TO SOLAR NEIGHBORHOOD STARS

被引：10
|
作者：
Carson, Joseph C. [1 ]
Hiner, Kyle D. [2 ]
Villar, Gregorio G., III [2 ]
Blaschak, Michael G. [2 ]
Rudolph, Alexander L. [2 ]
Stapelfeldt, Karl R. [3 ]
机构：
[1] Max Planck Inst Astron, D-69117 Heidelberg, Germany
[2] Calif State Polytech Univ Pomona, Dept Phys, Pomona, CA 91768 USA
[3] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
来源：
ASTRONOMICAL JOURNAL | 2009年 / 137卷 / 01期
关键词：
methods: data analysis; stars: low-mass; brown dwarfs; surveys; techniques: high angular resolution; ADAPTIVE OPTICS SURVEY; BROWN DWARF; T-DWARFS; SPECTRAL CLASSIFICATION; STELLAR-SYSTEMS; GIANT PLANETS; DISCOVERY; 2MASS; MMT;
D O I：
10.1088/0004-6256/137/1/218
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report techniques and results of a Palomar 200 inch (5 m) adaptive optics imaging survey of substellar companions to solar-type stars. The survey consists of K-s coronagraphic observations of 21 FGK dwarfs out to 20 pc (median distance similar to 17 pc). At 1 '' separation (17 projected AU) from a typical target system, the survey achieves median sensitivities 7 mag fainter than the parent star. In terms of companion mass, this corresponds to sensitivities of 50 M-J (1 Gyr), 70 M-J (solar age), and 75 M-J (10 Gyr), using the evolutionary models of Baraffe and colleagues. Using common proper motion to distinguish companions from field stars, we find that no system shows positive evidence of a previously unknown substellar companion (searchable separation similar to 20-250 projected AU at the median target distance).
引用
收藏
页码：218 / 225
页数：8
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