Discovery of a brown dwarf companion to the star HIP 64892

Anthony Cheetham 1 Mikael Bonnefoy 2 Silvano Desidera 3 Maud Langlois 4, 5 Arthur Vigan 5 Tobias Schmidt 6 Johan Olofsson 7, 8, 9 Gaël Chauvin 2, 8 Hubert Klahr 7 Raffaele Gratton 3 Valentina D’orazi 3 Thomas Henning 7 Martin Janson 7, 10 Beth Biller 7, 11 Sébastien Peretti 1 Janis Hagelberg 1, 2 Damien Segransan 1 Stéphane Udry 1 Dino Mesa 3, 12 Emanuele Sissa 3 Quentin Kral 6, 13 Joshua Schlieder 7, 14 Anne-Lise Maire 7 Christoph Mordasini 7, 15 François Menard 2 Alice Zurlo 5, 16 Jean-Luc Beuzit 2 Markus Feldt 7 David Mouillet 2 Matthias Meyer 17, 18 Anne-Marie Lagrange 2 Anthony Boccaletti 6 Miriam Keppler 7 Taisiya Kopytova 7, 19, 20 Roxanne Ligi 5 Daniel Rouan 6 Hervé Le Coroller 5 Carsten Dominik 21 Eric Lagadec 22 Massimo Turatto 3 Lyu Abe 22 Jacopo Antichi 23 Andrea Baruffolo 3 Pierre Baudoz 6 Patrick Blanchard 5 Tristan Buey 6 Marcel Carbillet 22 Michaël Carle 5 Enrico Cascone 24 Riccardo Claudi 3 Anne Costille 5 Alain Delboulbé 2 Vincenzo de Caprio 24 Kjetil Dohlen 5 Daniela Fantinel 3 Philippe Feautrier 2 Thierry Fusco 25 Enrico Giro 3 Laurence Gluck 2 Norbert Hubin 26 Emmanuel Hugot 5 Marc Jaquet 5 Markus Kasper 26 Marc Llored 5 Fabrice Madec 5 Yves Magnard 2 Patrice Martinez 22 Didier Maurel 2 David Le Mignant 5 Ole Möller-Nilsson 7 Thibaut Moulin 2 Alain Origné 5 Aleksei Pavlov 7 Denis Perret 6 Cyril Petit 25 Johan Pragt 27 Pascal Puget 2 Patrick Rabou 2 Jose Ricardo Ramos 7 Florence Rigal 21 Sylvain Rochat 2 Ronald Roelfsema 27 Gérard Rousset 6 Alain Roux 2 Bernardo Salasnich 3 Jean-François Sauvage 25 Arnaud Sevin 6 Christian Soenke 26 Eric Stadler 2 Marco Suarez 28 Luc Weber 1 François Wildi 1
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.
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Anthony Cheetham, Mikael Bonnefoy, Silvano Desidera, Maud Langlois, Arthur Vigan, et al.. Discovery of a brown dwarf companion to the star HIP 64892. Astronomy and Astrophysics - A&A, EDP Sciences, 2018, 615, pp.A160. ⟨10.1051/0004-6361/201832650⟩. ⟨hal-02268538⟩

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