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We report the discovery of a substellar companion to the nearby solar-typestar HD 46588 (F7V, 17.9 pc, ~3 Gyr). HD 46588 B was found through a survey forcommon proper motion companions to nearby stars using data from the Wide-fieldInfrared Survey Explorer and the Two-Micron All-Sky Survey. It has an angularseparation of 79.2" from its primary, which corresponds to a projected physicalseparation of 1420 AU. We have measured a spectral type of L9 for this objectbased on near-infrared spectroscopy performed with TripleSpec at PalomarObservatory. We estimate a mass of 0.064+0.008/-0.019 Msun from a comparison ofits luminosity to the values predicted by theoretical evolutionary models forthe age of the primary. Because of its companionship to a well-studied star, HD46588 B is one of the few known brown dwarfs at the L/T transition for whichboth age and distance estimates are available. Thus, it offers new constraintson the properties of brown dwarfs during this brief evolutionary phase. Thediscovery of HD 46588 B also illustrates the value of the Wide-field InfraredSurvey Explorer for identifying brown dwarfs in the solar neighborhood viatheir proper motions.

Discovery of a Companion at the L/T Transition with the Wide-field Infrared Survey Explorer