2010A&A...521L..54H

The frequency of brown dwarf and planetary-mass companions around intermediate-mass stars is still unknown. Imaging and radial velocity surveys have revealed a small number of substellar companions to these stars. In the course of an imaging survey we detected a visual companion to the intermediate-mass star HR6037. We here confirm it as a co-moving substellar object. We present two epoch observations of HR6037, an A6-type star with a companion candidate at 6.67" and position angle of 294 degrees. We also analyze near-infrared spectroscopy of the companion. Two epoch observations of HR6037 have allowed us to confirm HR6037B as a co-moving companion. Its J and H band spectra suggest that the object has a spectral type of M9, with a surface gravity that is intermediate between a 10Myr dwarf and a field dwarf of the same spectral type. The comparison of its K_s-band photometry with evolutionary tracks allows us to derive a mass, effective temperature, and surface gravity of 62±20M_Jup, T_eff=2330±200K, and logg= 5.1±0.2, respectively. The low binary mass ratio, q∼0.03, and its long orbital period, ∼5000yr, make HR6037 a rare and uncommon binary system.