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Discovery of a brown dwarf companion to the star HIP 64892

Discovery of a brown dwarf companion to the star HIP 64892
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.
- 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
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
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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