DISCOVERY OF A WIDE PLANETARY-MASS COMPANION TO THE YOUNG M3 STAR GU PSC

被引：102

作者：

Naud, Marie-Eve ^{[1
,2
]}

Artigau, Etienne ^{[1
,2
]}

Malo, Lison ^{[1
,2
]}

Albert, Loic ^{[1
,2
]}

Doyon, Rene ^{[1
,2
]}

Lafreniere, David ^{[1
,2
]}

Gagne, Jonathan ^{[1
,2
]}

Saumon, Didier ^{[3
]}

Morley, Caroline V. ^{[4
]}

Allard, France ^{[5
]}

Homeier, Derek ^{[5
]}

Beichman, Charles A. ^{[6
]}

Gelino, Christopher R. ^{[6
,7
]}

Boucher, Anne ^{[1
,2
]}

机构：

[1] Univ Montreal, Dept Phys, Montreal, PQ H3C 3J7, Canada

[2] Univ Montreal, Observ Mt Megantic, Montreal, PQ H3C 3J7, Canada

[3] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[4] Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA

[5] Univ Lyon, Ecole Normale Super Lyon, UMR CNRS 5574, Ctr Rech Astrophys Lyon, F-69364 Lyon 07, France

[6] CALTECH, Ctr Infrared Proc & Anal, Pasadena, CA 91125 USA

[7] CALTECH, NASA, Exoplanet Sci Inst, Pasadena, CA 91125 USA

来源：

ASTROPHYSICAL JOURNAL | 2014年 / 787卷 / 01期

基金：

欧洲研究理事会; 美国国家航空航天局; 加拿大创新基金会; 加拿大自然科学与工程研究理事会; 美国国家科学基金会;

关键词：

infrared: planetary systems; planetary systems; planets and satellites: detection; stars: imaging; stars: individual (GU Psc); stars: low-mass; VERY-LOW-MASS; ANGULAR-MOMENTUM EVOLUTION; INFRARED FILTER SET; DIGITAL SKY SURVEY; GAS GIANT PLANETS; L DWARF COMPANION; MID-T DWARFS; BROWN DWARFS; SUBSTELLAR COMPANION; AB-DORADUS;

D O I：

10.1088/0004-637X/787/1/5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the discovery of a comoving planetary-mass companion similar to 42 '' (similar to 2000AU) from a young M3 star, GU Psc, a likely member of the young AB Doradus Moving Group (ABDMG). The companion was first identified via its distinctively red i - z color (> 3.5) through a survey made with Gemini-S/GMOS. Follow-up Canada-France-Hawaii Telescope/WIRCam near-infrared (NIR) imaging, Gemini-N/GNIRS NIR spectroscopy and Wide-field Infrared Survey Explorer photometry indicate a spectral type of T3.5 +/- 1 and reveal signs of low gravity which we attribute to youth. Keck/Adaptive Optics NIR observations did not resolve the companion as a binary. A comparison with atmosphere models indicates T-eff = 1000-1100 K and log g = 4.5-5.0. Based on evolution models, this temperature corresponds to a mass of 9-13 M-Jup for the age of ABDMG (70-130 Myr). The relatively well-constrained age of this companion and its very large angular separation to its host star will allow its thorough characterization and will make it a valuable comparison for planetary-mass companions that will be uncovered by forthcoming planet-finder instruments such as Gemini Planet Imager and SPHERE.

引用

页数：16

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