Investigating 2MASS J06593158-0405277: a FUor burst in a triple system?

Alessio Caratti o Garatti, Rebeca Garcia Lopez, Tom P. Ray, Jochen Eisloeffel, Bringfried Stecklum, Aleks Scholz, Stefan Kraus, Gerd Weigelt, Alexander Kreplin, Victor Shenavrin

Published 2015-05-14Version 1

FUor outbursts in young stellar objects (YSOs) are the most dramatic events among episodic accretion phenomena. The origin of these bursts is not clear: disk instabilities and/or disk perturbations by an external body being the most viable hypotheses. Here, we report our VLT/SINFONI high angular resolution AO-assisted observations of 2MASS J06593158-0405277, which is undergoing a recently discovered FUor outburst. Our observations reveal the presence of an extended disc-like structure around the FUor, a very low-mass companion (2MASS J06593158-0405277B) at ~100 au in projection, and, possibly, a third closer companion at ~11 au. These sources appear to be young, displaying accretion signatures. Assuming the components are physically linked, 2MASS J06593158-0405277 would then be one of the very few triple systems observed in FUors.