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P\\'erez-Garrido, B. Gauza, B. Pantoja, J. S. Jenkins, M. R. Zapatero Osorio, N. Lodieu, R. Rebolo, S. Velasco, V. J. S. B\\'ejar","submitted_at":"2019-05-03T15:14:00Z","abstract_excerpt":"We demonstrate that the previously identified L/T transition brown dwarf SDSS J213154.43-011939.3 (SDSS 2131-0119) is a widely separated (82.3'', $\\sim$3830 au) common proper motion companion to the low-mass star NLTT 51469, which we reveal to be a close binary itself, separated by 0.64''$\\pm$0.01'' ($\\sim$30 au). We find the proper motion of SDSS 2131-0119 of $\\mu_{\\alpha}\\cos\\delta=-100\\pm20$, $\\mu_{\\delta}=-230\\pm20$ mas/yr consistent with the proper motion of the primary provided by Gaia DR2: $\\mu_{\\alpha}\\cos\\delta=-95.49\\pm0.96$, $\\mu_{\\delta}=-239.38\\pm0.96$ mas/yr. 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