A SEARCH FOR A DISTANT COMPANION TO THE SUN WITH THE WIDE-FIELD INFRARED SURVEY EXPLORER

被引：72
|
作者：
Luhman, K. L. [1 ,2 ]
机构：
[1] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA
[2] Penn State Univ, Ctr Exoplanets & Habitable Worlds, University Pk, PA 16802 USA
来源：
ASTROPHYSICAL JOURNAL | 2014年 / 781卷 / 01期
关键词：
brown dwarfs; infrared: planetary systems; planets and satellites: detection; proper motions; solar neighborhood; KUIPER-BELT OBJECTS; BROWN DWARF; SOLAR COMPANION; PROPER MOTIONS; GIANT PLANETS; SKY SURVEY; T-DWARFS; DISCOVERY; EXTINCTION; CANDIDATE;
D O I：
10.1088/0004-637X/781/1/4
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
I have used multi-epoch astrometry from the Wide-field Infrared Survey Explorer to perform a search for a distant companion to the Sun via its parallactic motion. I have not found an object of this kind down to W2 = 14.5. This limit corresponds to analogs of Saturn and Jupiter at 28,000 and 82,000 AU, respectively, according to models of the Jovian planets by Fortney and coworkers. Models of brown dwarfs by Burrows and coworkers predict fainter fluxes at a given mass for the age of the solar system, producing a closer distance limit of 26,000 AU for a Jupiter-mass brown dwarf. These constraints exclude most combinations of mass and separation at which a solar companion has been suggested to exist by various studies over the years.
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页数：7
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