Discovery of a brown dwarf companion to the star HIP 64892

Cheetham, A.A.CheethamBonnefoy, M.M.BonnefoyDESIDERA, SilvanoSilvanoDESIDERALanglois, M.M.LangloisVigan, A.A.ViganSchmidt, T.T.SchmidtOlofsson, J.J.OlofssonChauvin, G.G.ChauvinKlahr, H.H.KlahrGRATTON, RaffaeleRaffaeleGRATTOND'ORAZI, VALENTINAVALENTINAD'ORAZIHenning, T.T.HenningJanson, M.M.JansonBiller, B.B.BillerPeretti, S.S.PerettiHagelberg, J.J.HagelbergSégransan, D.D.SégransanUdry, S.S.UdryMESA, DINODINOMESASissa, E.E.SissaKral, Q.Q.KralSchlieder, J.J.SchliederMaire, A. -L.A. -L.MaireMordasini, C.C.MordasiniMenard, F.F.MenardZurlo, A.A.ZurloBeuzit, J. -L.J. -L.BeuzitFeldt, M.M.FeldtMouillet, D.D.MouilletMeyer, M.M.MeyerLagrange, A. -M.A. -M.LagrangeBoccaletti, A.A.BoccalettiKeppler, M.M.KepplerKopytova, T.T.KopytovaLIGI, ROXANNEROXANNELIGIRouan, D.D.RouanLe Coroller, H.H.Le CorollerDominik, C.C.DominikLagadec, E.E.LagadecTURATTO, MassimoMassimoTURATTOAbe, L.L.AbeAntichi, J.J.AntichiBARUFFOLO, AndreaAndreaBARUFFOLOBaudoz, P.P.BaudozBlanchard, P.P.BlanchardBuey, T.T.BueyCarbillet, M.M.CarbilletCarle, M.M.CarleCASCONE, EnricoEnricoCASCONECLAUDI, RiccardoRiccardoCLAUDICostille, A.A.CostilleDelboulbé, A.A.DelboulbéDe Caprio, V.V.De CaprioDohlen, K.K.DohlenFANTINEL, DanielaDanielaFANTINELFeautrier, P.P.FeautrierFusco, T.T.FuscoGIRO, EnricoEnricoGIROGluck, L.L.GluckHubin, N.N.HubinHugot, E.E.HugotJaquet, M.M.JaquetKasper, M.M.KasperLlored, M.M.LloredMadec, F.F.MadecMagnard, Y.Y.MagnardMartinez, P.P.MartinezMaurel, D.D.MaurelLe Mignant, D.D.Le MignantMöller-Nilsson, O.O.Möller-NilssonMoulin, T.T.MoulinOrigné, A.A.OrignéPavlov, A.A.PavlovPerret, D.D.PerretPetit, C.C.PetitPragt, J.J.PragtPuget, P.P.PugetRabou, P.P.RabouRamos, J.J.RamosRigal, F.F.RigalRochat, S.S.RochatRoelfsema, R.R.RoelfsemaRousset, G.G.RoussetRoux, A.A.RouxSALASNICH, BernardoBernardoSALASNICHSauvage, J. -F.J. -F.SauvageSevin, A.A.SevinSoenke, C.C.SoenkeStadler, E.E.StadlerSuarez, M.M.SuarezWeber, L.L.WeberWildi, F.F.Wildi2020-11-202020-11-2020180004-6361http://hdl.handle.net/20.500.12386/28479We report the discovery of a bright, brown dwarf companion to the star HIP 64892, imaged with VLT/SPHERE during the SHINE exoplanet survey. The host is a B9.5V member of the Lower-Centaurus-Crux subgroup of the Scorpius Centaurus OB association. The measured angular separation of the companion (1.2705 ± 0.0023") corresponds to a projected distance of 159 ± 12 AU. We observed the target with the dual-band imaging and long-slit spectroscopy modes of the IRDIS imager to obtain its spectral energy distribution (SED) and astrometry. In addition, we reprocessed archival NACO L-band data, from which we also recover the companion. Its SED is consistent with a young (<30 Myr), low surface gravity object with a spectral type of M9γ ± 1. From comparison with the BT-Settl atmospheric models we estimate an effective temperature of Teff = 2600 ± 100 K, and comparison of the companion photometry to the COND evolutionary models yields a mass of 29-37 MJ at the estimated age of 16-7+15 Myr for the system. The star HIP 64892 is a rare example of an extreme-mass ratio system (q 0.01) and will be useful for testing models relating to the formation and evolution of such low-mass objects. Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programmes 096.C-0241 and 198.C-0209 (PI: J.-L. Beuzit), 098.A-9007(A) (PI: P. Sarkis), and 087.C-0790(A) (PI: M. Ireland).STAMPAenDiscovery of a brown dwarf companion to the star HIP 64892Article10.1051/0004-6361/2018326502-s2.0-85055139238000440420500001https://www.aanda.org/articles/aa/abs/2018/07/aa32650-18/aa32650-18.html2018A&A...615A.160CFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation