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We present the discovery of a co-moving planetary-mass companion ~42" (~2000AU) from a young M3 star, GU Psc, likely member of the young AB Doradus MovingGroup (ABDMG). The companion was first identified via its distinctively red i -z color (> 3.5) through a survey made with Gemini-S/GMOS. Follow-upCanada-France-Hawaii Telescope/WIRCam near-infrared (NIR) imaging,Gemini-N/GNIRS NIR spectroscopy and Wide-field Infrared Survey Explorerphotometry indicate a spectral type of T3.5+-1 and reveal signs of low gravitywhich we attribute to youth. Keck/Adaptive Optics NIR observations did notresolve the companion as a binary. A comparison with atmosphere modelsindicates Teff = 1000-1100 K and logg = 4.5-5.0. Based on evolution models,this temperature corresponds to a mass of 9-13 MJup for the age of ABDMG(70-130 Myr). The relatively well-constrained age of this companion and itsvery large angular separation to its host star will allow its thoroughcharacterization and will make it a valuable comparison for planetary-masscompanions that will be uncovered by forthcoming planet-finder instruments suchas Gemini Planet Imager and SPHERE.

Discovery of a wide planetary-mass companion to the young M3 star GU Psc