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Boffin, H. M. J.; Pourbaix, D.; Mužić, K.; Ivanov, V. D.; Kurtev, R.; Beletsky, Y.; Mehner, A.; Berger, J. P.; Girard, J. H.; Mawet, D.
Astronomy and astrophysics (Berlin), 01/2014, Letnik: 561Journal Article
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.
