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The astrometric space mission Gaia is expected to detect a large number ofbrown dwarf binary systems with close orbits and determine astrometric orbitsolutions. This will provide key information for the formation and evolution ofbrown dwarfs, such as the binary frequency and dynamical masses. Known browndwarf binaries with orbit constraints from other techniques will play animportant role. We are carrying out one of the most precise and long-lastingradial velocity surveys for brown dwarf binaries in the Cha I star-formingregion at the VLT. We were able to add two orbit determinations to the smallgroup of a handful of brown dwarf and very low-mass binaries with characterizedRV orbits. We show here that the astrometric motion of both systems can bedetected with Gaia. We predict an astrometric signal of about 1.2 - 1.6milliarcseconds (mas) for the brown dwarf binary ChaHa8 and of 0.4 - 0.8 masfor the very low-mass binary CHXR74. We take the luminosity of the companioninto account for these estimates and present a relation for the astrometricsignature of a companion with non-negligible luminosity.

Gaia Detection Capabilities of Spectroscopic Brown Dwarf Binaries