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Discovery of a brown dwarf companion to the star HIP 64892

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

Discovery of a brown dwarf companion to the star HIP 64892

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
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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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
31
Top 10%
Average
Top 10%
Green
bronze
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