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27 April 2024

» arxiv » 1803.2725

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Discovery of a brown dwarf companion to the star HIP 64892
A. Cheetham ; M. Bonnefoy ; S. Desidera ; M. Langlois ; A. Vigan ; T. Schmidt ; J. Olofsson ; G. Chauvin ; H. Klahr ; R. Gratton ; V. D'Orazi ; T. Henning ; M. Janson ; B. Biller ; S. Peretti ; J. Hagelberg ; D. Ségransan ; S. Udry ; D. Mesa ; E. Sissa ; Q. Kral ; J. Schlieder ; A.-L. Maire ; C. Mordasini ; F. Menard ; A. Zurlo ; J.-L. Beuzit ; M. Feldt ; D. Mouillet ; M. Meyer ; A.-M. Lagrange ; A. Boccaletti ; M. Keppler ; T. Kopytova ; R. Ligi ; D. Rouan ; H. Le Coroller ; C. Dominik ; E. Lagadec ; M. Turatto ; L. Abe ; J. Antichi ; A. Baruffolo ; P. Baudoz ; P. Blanchard ; T. Buey ; M. Carbillet ; M. Carle ; E. Cascone ; R. Claudi ; A. Costille ; A. Delboulbé ; V. De Caprio ; K. Dohlen ; D. Fantinel ; P. Feautrier ; T. Fusco ; E. Giro ; L. Gluck ; N. Hubin ; E. Hugot ; M. Jaquet ; M. Kasper ; M. Llored ; F. Madec ; Y. Magnard ; P. Martinez ; D. Maurel ; D. Le Mignant ; O. Möller-Nilsson ; T. Moulin ; A. Origné ; A. Pavlov ; D. Perret ; C. Petit ; J. Pragt ; P. Puget ; P. Rabou ; J. Ramos ; F. Rigal ; S. Rochat ; R. Roelfsema ; G. Rousset ; A. Roux ; B. Salasnich ; J.-F. Sauvage ; A. Sevin ; C. Soenke ; E. Stadler ; M. Suarez ; L. Weber ; F. Wildi ;
Date:	7 Mar 2018
Abstract:	We 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 ($1.2705pm0.0023$") corresponds to a projected distance of $159pm12$ AU. We observed the target with the dual-band imaging and long-slit spectroscopy modes of the IRDIS imager to obtain its 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 M9$_{gamma}pm1$. From comparison with the BT-Settl atmospheric models we estimate an effective temperature of $T_{ extrm{eff}}=2600 pm 100$ K, and comparison of the companion photometry to the COND evolutionary models yields a mass of $sim29-37$ M$_{ ext{J}}$ at the estimated age of $16^{+15}_{-7}$ Myr for the system. HIP 64892 is a rare example of an extreme-mass ratio system ($qsim0.01$) and will be useful for testing models relating to the formation and evolution of such low-mass objects.
Source:	arXiv, 1803.2725
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