Volume 561, January 2014
|Number of page(s)||5|
|Published online||23 December 2013|
Possible astrometric discovery of a substellar companion to the closest binary brown dwarf system WISE J104915.57–531906.1⋆,⋆⋆
ESO, Av. Alonso de Cordova 3107, 19001 Casilla,
2 Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles (ULB), 1050 Bruxelles, Belgium
3 Departamento de Física y Astronomía, Universidad de Valparaiso, Av. Gran Bretaña 1111, 5030 Playa Ancha, Casilla, Chile
4 Las Campanas Observatory, Carnegie Institution of Washington, Colina el Pino, 601 Casilla, La Serena, Chile
5 ESO, Karl-Schwarzschild-str. 2, 85478 Garching, Germany
Accepted: 4 December 2013
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.
Key words: binaries: visual / parallaxes / astrometry / brown dwarfs
Figures 2 and 3 and Table 3 are available in electronic form at http://www.aanda.org
© ESO, 2013
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