Discovery of a brown dwarf companion to the star HIP 64892
Journal
Date Issued
2018
Author(s)
Cheetham, A.
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Bonnefoy, M.
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Langlois, M.
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Vigan, A.
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•
Olofsson, J.
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Chauvin, G.
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Klahr, H.
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•
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Henning, T.
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Janson, M.
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Biller, B.
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Peretti, S.
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Hagelberg, J.
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Ségransan, D.
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Udry, S.
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Sissa, E.
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Kral, Q.
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Schlieder, J.
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Maire, A. -L.
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Mordasini, C.
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Menard, F.
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Zurlo, A.
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Beuzit, J. -L.
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Feldt, M.
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Mouillet, D.
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Meyer, M.
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Lagrange, A. -M.
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Boccaletti, A.
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Keppler, M.
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Kopytova, T.
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•
Rouan, D.
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Le Coroller, H.
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Dominik, C.
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Lagadec, E.
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•
Abe, L.
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Antichi, J.
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Baudoz, P.
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Blanchard, P.
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Buey, T.
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Carbillet, M.
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Carle, M.
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•
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Costille, A.
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Delboulbé, A.
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Dohlen, K.
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Feautrier, P.
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Fusco, T.
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Gluck, L.
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Hubin, N.
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Hugot, E.
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Jaquet, M.
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Kasper, M.
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Llored, M.
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Madec, F.
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Magnard, Y.
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Martinez, P.
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Maurel, D.
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Le Mignant, D.
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Möller-Nilsson, O.
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Moulin, T.
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Origné, A.
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Pavlov, A.
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Perret, D.
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Petit, C.
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Pragt, J.
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Puget, P.
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Rabou, P.
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Ramos, J.
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Rigal, F.
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Rochat, S.
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Roelfsema, R.
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Rousset, G.
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Roux, A.
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Sauvage, J. -F.
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Sevin, A.
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Soenke, C.
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Stadler, E.
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Suarez, M.
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Weber, L.
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Wildi, F.
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 (1.2705 ± 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).
Volume
615
Start page
A160
Issn Identifier
0004-6361
Ads BibCode
2018A&A...615A.160C
Rights
open.access
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