Discovery of a brown dwarf companion to the star HIP 64892 - Université Claude Bernard Lyon 1 Accéder directement au contenu
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2018

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)
Thomas Henning
Roxanne Ligi
Carsten Dominik
Lyu Abe
  • Fonction : Auteur
Emmanuel Hugot

Résumé

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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Dates et versions

hal-02268538 , version 1 (21-08-2019)

Identifiants

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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, 2018, 615, pp.A160. ⟨10.1051/0004-6361/201832650⟩. ⟨hal-02268538⟩
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