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Using FORS2 on the Very Large Telescope, we have astrometrically monitoredover a period of two months the two components of the brown dwarf system WISEJ104915.57-531906.1, the closest one to the Sun. Our astrometric measurements -with a relative precision at the milli-arcsecond scale - allow us to detect theorbital motion and derive more precisely the parallax of the system, leading toa distance of 2.020+/-0.019 pc. The relative orbital motion of the two objectsis found to be perturbed, which leads us to suspect the presence of asubstellar companion around one of the two components. We also perform VRIzphotometry of both components and compare with models. We confirm the fluxreversal of the T dwarf.

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