HD 202206: A Circumbinary Brown Dwarf System

被引：12

作者：

Benedict, G. Fritz ^{[1
]}

Harrison, Thomas E. ^{[2
]}

机构：

[1] Univ Texas Austin, McDonald Observ, Austin, TX 78712 USA

[2] New Mexico State Univ, Dept Astron, Box 30001,MSC 4500, Las Cruces, NM 88003 USA

来源：

ASTRONOMICAL JOURNAL | 2017年 / 153卷 / 06期

关键词：

astrometry; binaries: general; brown dwarfs; planetary systems; HUBBLE-SPACE-TELESCOPE; PRECISION RADIAL-VELOCITIES; REDUCED PROPER-MOTION; TRIGONOMETRIC PARALLAXES; ASTROMETRY; CATALOG; STARS; MASS; CONSTRAINTS; STABILITY;

D O I：

10.3847/1538-3881/aa6d59

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using Hubble Space Telescope Fine Guidance Sensor astrometry and previously published radial velocity measures, we explore the exoplanetary system HD 202206. Our modeling results in a parallax, pi(abs) = 21.96 +/- 0.12 milliseconds of arc, a mass for HD 202206 B of M-B =0.089(-0.006)(+0.007) M-circle dot, and a mass for HD 202206 c of M-c = 17.9(-1.8)(+2.9) M-Jup. HD 202206 is a nearly face-on G + M binary orbited by a brown dwarf. The system architecture that we determine supports past assertions that stability requires a 5: 1 mean motion resonance (we find a period ratio, P-c/P-B= 4.92 +/- 0.04) and coplanarity (we find a mutual inclination, Phi = 6 degrees +/- 2 degrees).

引用

页数：12

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