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Discovery of a brown dwarf companion to the star HIP 64892

descriptionPublicationkeyboard_double_arrow_right Article , Preprint , Other literature type , Journal 01 Jul 2018Embargo end date: 01 Jan 2018 Italy, Russian Federation, Russian Federation, Netherlands, Chile, France Publisher:EDP SciencesJournal:Astronomy & Astrophysics, volume 615, page A160 (issn: 0004-6361, eissn: 1432-0746,

Authors: Silvano Desidera; L. Weber; Arnaud Sevin; Jean-Luc Beuzit; L. Gluck; Valentina D'Orazi; Jean-François Sauvage; +100 Authors

doi: 10.1051/0004-6361/201832650 , 10.48550/arxiv.1803.02725 , 10.7892/boris.128845

arXiv: http://arxiv.org/abs/1803.02725 , 1803.02725

handle: 11245.1/54d6d83a-dccb-409c-b9b9-b43746323be2

Discovery of a brown dwarf companion to the star HIP 64892

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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.

Countries

Italy, Russian Federation, Russian Federation, Netherlands, Chile, France

Related Organizations

Laboratoire Parole et Langage
France
Ural Federal University
Russian Federation
University Hospital of Bern
Switzerland
University of Geneva
Switzerland
Département Sciences sociales, agriculture et alimentation, espace et environnement
France

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Keywords

INDIVIDUAL: HIP 64892 [STARS], HIGH ANGULAR RESOLUTIONS [TECHNIQUES], BROWN DWARFS, FOS: Physical sciences, DETECTIONS [PLANETS AND SATELLITES], OPTIQUE ADAPTATIVE, Techniques: high angular resolution, VLT, [SDU.ASTR.SR] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], Planets and satellites: atmospheres, DETECTION [PLANETS AND SATELLITES], brown dwarfs individual: HIP 64892 [Stars], Stars: brown dwarfs individual: HIP 64892, Solar and Stellar Astrophysics (astro-ph.SR), HIGH ANGULAR RESOLUTION [TECHNIQUES], [PHYS]Physics [physics], ASTRONOMIE, Earth and Planetary Astrophysics (astro-ph.EP), INDIVIDUAL [STARS], Brown dwarfs, [SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], EFFECTIVE TEMPERATURE, Planets and satellites: detection, 520, EVOLUTIONARY MODELS, high angular resolution [Techniques], detection [Planets and satellites], FORMATION AND EVOLUTIONS, Astrophysics - Solar and Stellar Astrophysics, ATMOSPHERES [SATELLITES], SPECTRAL ENERGY DISTRIBUTION, Stars: individual: HIP 64892, SATELLITES, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], STARS, PLANETS, Astrophysics - Earth and Planetary Astrophysics

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