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Possible astrometric discovery of a substellar companion to the closest binary brown dwarf system WISE J104915.57–531906.1

Boffin, H. M. J. and Pourbaix, D. and Mužic, K. and Ivanov, V. D. and Kurtev, R. and Beletsky, Y. and Mehner, A. and Berger, J. P. and Girard, J. H. and Mawet, D. (2014) Possible astrometric discovery of a substellar companion to the closest binary brown dwarf system WISE J104915.57–531906.1. Astronomy and Astrophysics, 561 . Art. No. L4. ISSN 0004-6361. doi:10.1051/0004-6361/201322975.

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Using FORS2 on the Very Large Telescope, we have astrometrically monitored over a period of two months the two components of the brown dwarf system WISE J104915.57-531906.1, the closest one to the Sun. Our astrometric measurements – with a relative precision at the milli-arcsecond scale – allowed us to detect the orbital motion and derive more precisely the parallax of the system, leading to a distance of 2.020 ± 0.019 pc. The relative orbital motion of the two objects is found to be perturbed, which leads us to suspect the presence of a substellar companion around one of the two components. We also performed VRIz photometry of the two components and compared this with models. We confirm the flux reversal of the T dwarf.

Item Type:Article
Related URLs:
URLURL TypeDescription
Mehner, A.0000-0002-9564-3302
Berger, J. P.0000-0001-5025-0428
Girard, J. H.0000-0001-8627-0404
Mawet, D.0000-0002-8895-4735
Additional Information:© 2013 ESO. Article published by EDP Science. Received 3 November 2013; accepted 4 December 2013. It is a pleasure to thank Petro Lazorenko for useful discussions, as well as an anonymous referee for comments that improved the paper. R.K. acknowledges support from FONDECYT through grants No. 1130140. Based on data obtained with the ESO Very Large Telescope under programme 291.C-5004.
Funding AgencyGrant Number
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1130140
Subject Keywords:binaries: visual; parallaxes; astrometry; brown dwarfs
Record Number:CaltechAUTHORS:20150521-094949966
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57731
Deposited On:22 May 2015 20:20
Last Modified:10 Nov 2021 21:54

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