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

页码：218 / 225

页数：8

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