Discovery of a brown dwarf companion to the star HIP 64892

Cheetham, A.; Bonnefoy, M.; Desidera, S.; Langlois, M.; Vigan, A.; Schmidt, T.; Olofsson, J.; Chauvin, G.; Klahr, H.; Gratton, R.; D'Orazi, V.; Henning, T.; Janson, M.; Biller, B.; Peretti, S.; Hagelberg, J.; Ségransan, D.; Udry, S.; Mesa, D.; Sissa, E.; Kral, Q.; Schlieder, J.; Maire, A. -L.; Mordasini, C.; Menard, F.; Zurlo, A.; Beuzit, J. -L.; Feldt, M.; Mouillet, D.; Meyer, M.; Lagrange, A. -M.; Boccaletti, A.; Keppler, M.; Kopytova, T.; Ligi, R.; Rouan, D.; Le Coroller, H.; Dominik, C.; Lagadec, E.; Turatto, M.; Abe, L.; Antichi, J.; Baruffolo, A.; Baudoz, P.; Blanchard, P.; Buey, T.; Carbillet, M.; Carle, M.; Cascone, E.; Claudi, R.; Costille, A.; Delboulbé, A.; De Caprio, V.; Dohlen, K.; Fantinel, D.; Feautrier, P.; Fusco, T.; Giro, E.; Gluck, L.; Hubin, N.; Hugot, E.; Jaquet, M.; Kasper, M.; Llored, M.; Madec, F.; Magnard, Y.; Martinez, P.; Maurel, D.; Le Mignant, D.; Möller-Nilsson, O.; Moulin, T.; Origné, A.; Pavlov, A.; Perret, D.; Petit, C.; Pragt, J.; Puget, P.; Rabou, P.; Ramos, J.; Rigal, F.; Rochat, S.; Roelfsema, R.; Rousset, G.; Roux, A.; Salasnich, B.; Sauvage, J. -F.; Sevin, A.; Soenke, C.; Stadler, E.; Suarez, M.; Weber, L.; Wildi, F.

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Discovery of a brown dwarf companion to the star HIP 64892

Cheetham, A., Bonnefoy, M., Desidera, S., Langlois, M., Vigan, A., Schmidt, T., et al. (2018). Discovery of a brown dwarf companion to the star HIP 64892. Astronomy and Astrophysics, 615.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CE78-D Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CE79-C

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https://ui.adsabs.harvard.edu/abs/2018A&A...615A.160C (Any fulltext) Open Access status unknown

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Cheetham, A.¹, Author
Bonnefoy, M.¹, Author
Desidera, S.¹, Author
Langlois, M.¹, Author
Vigan, A.¹, Author
Schmidt, T.¹, Author
Olofsson, J.¹, Author
Chauvin, G.¹, Author
Klahr, H.¹, Author
Gratton, R.¹, Author
D'Orazi, V.¹, Author
Henning, T.¹, Author
Janson, M.¹, Author
Biller, B.¹, Author
Peretti, S.¹, Author
Hagelberg, J.¹, Author
Ségransan, D.¹, Author
Udry, S.¹, Author
Mesa, D.¹, Author
Sissa, E.¹, Author
Kral, Q.¹, AuthorSchlieder, J.¹, AuthorMaire, A. -L.¹, AuthorMordasini, C.¹, AuthorMenard, F.¹, AuthorZurlo, A.¹, AuthorBeuzit, J. -L.¹, AuthorFeldt, M.¹, AuthorMouillet, D.¹, AuthorMeyer, M.¹, AuthorLagrange, A. -M.¹, AuthorBoccaletti, A.¹, AuthorKeppler, M.¹, AuthorKopytova, T.¹, AuthorLigi, R.¹, AuthorRouan, D.¹, AuthorLe Coroller, H.¹, AuthorDominik, C.¹, AuthorLagadec, E.¹, AuthorTuratto, M.¹, AuthorAbe, L.¹, AuthorAntichi, J.¹, AuthorBaruffolo, A.¹, AuthorBaudoz, P.¹, AuthorBlanchard, P.¹, AuthorBuey, T.¹, AuthorCarbillet, M.¹, AuthorCarle, M.¹, AuthorCascone, E.¹, AuthorClaudi, R.¹, AuthorCostille, A.¹, AuthorDelboulbé, A.¹, AuthorDe Caprio, V.¹, AuthorDohlen, K.¹, AuthorFantinel, D.¹, AuthorFeautrier, P.¹, AuthorFusco, T.¹, AuthorGiro, E.¹, AuthorGluck, L.¹, AuthorHubin, N.¹, AuthorHugot, E.¹, AuthorJaquet, M.¹, AuthorKasper, M.¹, AuthorLlored, M.¹, AuthorMadec, F.¹, AuthorMagnard, Y.¹, AuthorMartinez, P.¹, AuthorMaurel, D.¹, AuthorLe Mignant, D.¹, AuthorMöller-Nilsson, O.¹, AuthorMoulin, T.¹, AuthorOrigné, A.¹, AuthorPavlov, A.¹, AuthorPerret, D.¹, AuthorPetit, C.¹, AuthorPragt, J.¹, AuthorPuget, P.¹, AuthorRabou, P.¹, AuthorRamos, J.¹, AuthorRigal, F.¹, AuthorRochat, S.¹, AuthorRoelfsema, R.¹, AuthorRousset, G.¹, AuthorRoux, A.¹, AuthorSalasnich, B.¹, AuthorSauvage, J. -F.¹, AuthorSevin, A.¹, AuthorSoenke, C.¹, AuthorStadler, E.¹, AuthorSuarez, M.¹, AuthorWeber, L.¹, AuthorWildi, F.¹, Author more..

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1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692

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Free keywords: brown dwarfs stars: individual: HIP 64892 techniques: high angular resolution planets and satellites: detection planets and satellites: atmospheres Astrophysics - Earth and Planetary Astrophysics Astrophysics - Solar and Stellar Astrophysics

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 M9_γ ± 1. From comparison with the BT- Settl atmospheric models we estimate an effective temperature of T_eff = 2600 ± 100 K, and comparison of the companion photometry to the COND evolutionary models yields a mass of 29-37 M_J 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).

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Dates: Date issued: 2018

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Title: Astronomy and Astrophysics

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Pages: - Volume / Issue: 615 Sequence Number: - Start / End Page: - Identifier: -