Journal
ASTROPHYSICAL JOURNAL
Volume 787, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/787/1/5
Keywords
infrared: planetary systems; planetary systems; planets and satellites: detection; stars: imaging; stars: individual (GU Psc); stars: low-mass
Categories
Funding
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- Fond de Recherche Quebecois-Nature et Technologie (FRQNT
- Quebec)
- NASA [NNH11AQ54I]
- European Research Council under the European Community [247060]
- Gemini-S/PHOENIX: program [GS-2010B-Q-89]
- Gemini-S/GMOS: program [GS-2011B-Q-74]
- Gemini-S/NICI [GS-2011BQ-24, GS-2012B-Q-54]
- Gemini-N/GNIRS: program [GN-2012B-Q-58]
- European Southern Observatory Very Large Telescope under program [087.D-0510, 091.D-0641]
- Universite de Montreal
- Universite Laval and the Canada Foundation for Innovation
- W.M. Keck Foundation
- NASA InfraRed Telescope Facility, with SpeX [2013B025]
- National Aeronautics and Space Administration, from the Two Micron All Sky Survey
- National Aeronautics and Space Administration
- National Science Foundation, of the NASA's Astrophysics Data System Bibliographic Services, SIMBAD database, the VizieR catalog access tool and the SIMBAD database operated at CDS, Strasbourg, France
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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.
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