„Possible astrometric discovery of a substellar companion to the closest binary brown dwarf system WISE J104915.57-531906.1“, H.M.J. Boffin, D. Pourbaix, K. Muzic, V.D. Ivanov, R. Kurtev, Y. Beletsky, A. Mehner, J.P. Berger, J.H. Girard, D. Mawet (Astronomy and Astrophysics, in press)


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 – allow 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 perform VRIz photometry of both components and compare with models. We confirm the flux reversal of the T dwarf.

A PDF is available here: http://arxiv.org/pdf/1312.1303v1

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