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EDP Sciences, Astronomy & Astrophysics, (561), p. L4, 2013

DOI: 10.1051/0004-6361/201322975

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

Journal article published in 2013 by Henri M. J. Boffin, Dimitri Pourbaix, K. Muv zi'c, K. Muzic, V. D. Ivanov, R. Kurtev, Y. Beletsky, A. Mehner, J.-P. Berger, J. H. Girard ORCID, D. Mawet
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

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. © 2013 ESO. ; SCOPUS: ar.j ; info:eu-repo/semantics/published