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We report the detection of radio emission and orbital motion from the nearbystar-brown dwarf binary WISE J072003.20-084651.2AB. Radio observations acrossthe 4.5-6.5 GHz band with the Very Large Array identify at the position of thesystem quiescent emission with a flux density of 15$\pm$3 $\mu$Jy, and ahighly-polarized radio source that underwent a 2-3 min burst with peak fluxdensity 300$\pm$90 $\mu$Jy. The latter emission is likely a low-level magneticflare similar to optical flares previously observed for this source. Nooutbursts were detected in separate narrow-band H$\alpha$ monitoringobservations. We report new high-resolution imaging and spectroscopicobservations that confirm the presence of a co-moving T5.5 secondary andprovide the first indications of three-dimensional orbital motion. We usedthese data to revise our estimates for the orbital period (4.1$^{+2.7}_{-1.3}$yr) and tightly constrain the orbital inclination to be nearly edge-on(93.6\deg$^{+1.6\deg}_{-1.4\deg}$), although robust measures of the componentand system masses will require further monitoring. The inferred orbital motiondoes not change the high likelihood that this radio-emitting very low-massbinary made a close pass to the Sun in the past 100 kyr.

Radio Emission and Orbital Motion from the Close-Encounter Star-Brown Dwarf Binary WISE J072003.20-084651.2