VLT-KMOS NIR sp. of SSTc2d J163134.1-240060

We report the serendipitous discovery of an elliptical shell of CO associated with the faint stellar object SSTc2d J163134.1-240060 as part of the "Ophiuchus Disk Survey Employing ALMA" (ODISEA), a project aiming to study the entire population of protoplanetary disks in the Ophiuchus Molecular Cloud from 230GHz continuum emission and ^12^CO(J=2-1), ^13^CO(J=2-1) and C^18^CO(J=2-1) lines readable in Band 6. Remarkably, we detect a bright ^12^CO elliptical shape emission of ~3"x4" toward SSTc2d J163134.1-240060 without a 230GHz continuum detection.

Based on the observed near-IR spectrum taken with the Very Large Telescope (KMOS), the brightness of the source, its three-dimensional motion, and Galactic dynamic arguments, we conclude that the source is not a giant star in the distant background (>5-10kpc) and is most likely to be a young brown dwarf in the Ophiuchus cloud, at a distance of just ~139pc. This is the first report of quasi-spherical mass loss in a young brown dwarf.