DYNAMICAL MASSES OF YOUNG M DWARFS: MASSES AND ORBITAL PARAMETERS OF GJ 3305 AB, THE WIDE BINARY COMPANION TO THE IMAGED EXOPLANET HOST 51 ERI

被引：43

作者：

Montet, Benjamin T. ^{[1
,2
]}

Bowler, Brendan P. ^{[1
]}

Shkolnik, Evgenya L. ^{[3
,4
]}

Deck, Katherine M. ^{[1
]}

Wang, Ji ^{[1
,5
]}

Horch, Elliott P. ^{[6
]}

Liu, Michael C. ^{[7
]}

Hillenbrand, Lynne A. ^{[1
]}

Kraus, Adam L. ^{[8
]}

Charbonneau, David ^{[2
]}

机构：

[1] CALTECH, Cahill Ctr Astron & Astrophys, Pasadena, CA 91125 USA

[2] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[3] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA

[4] Lowell Observ, Flagstaff, AZ 86001 USA

[5] Yale Univ, Dept Astron, New Haven, CT 06511 USA

[6] So Connecticut State Univ, Dept Phys, New Haven, CT 06515 USA

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

[8] Univ Texas Austin, Dept Astron, Austin, TX 78712 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2015年 / 813卷 / 01期

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

astrometry; binaries: close; stars: fundamental parameters; stars: individual (GJ 3305 AB); PRE-MAIN-SEQUENCE; GIANT PLANETS; STARS; SEARCH; AGE; KINEMATICS; ASTROMETRY; TELESCOPE; MYR;

D O I：

10.1088/2041-8205/813/1/L11

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We combine new high resolution imaging and spectroscopy from Keck/NIRC2, Discovery Channel Telescope/DSSI, and Keck/HIRES with published astrometry and radial velocities to measure individual masses and orbital elements of the GJ 3305 AB system, a young (similar to 20 Myr) M+M binary (unresolved spectral type M0) member of the beta Pictoris moving group comoving with the imaged exoplanet host 51 Eri. We measure a total system mass of 1.11 +/- 0.04 M-circle dot, a period of 29.03 +/- 0.50 year, a semimajor axis of 9.78 +/- 0.14 AU, and an eccentricity of 0.19 +/- 0.02. The primary component has a dynamical mass of 0.67 +/- 0.05 M-circle dot and the secondary has a mass of 0.44 +/- 0.05 M-circle dot. The recently updated BHAC15 models are consistent with the masses of both stars to within 1.5 sigma. Given the observed masses the models predict an age of the GJ 3305 AB system of 37 +/- 9 Myr. Based on the observed system architecture and our dynamical mass measurement, it is unlikely that the orbit of 51 Eri b has been significantly altered by the Kozai-Lidov mechanism.

引用

页数：7