2015A&A...582L..12H

We monitored the recent FUor 2MASS J06593158-0405277 (V960 Mon) since November 2009 at various observatories and multiple wavelengths. After the outburst by nearly 2.9mag in r around September 2014 the brightness gently fades until April 2015 by nearly 1mag in U and 0.5mag in z. Thereafter the brightness at λ>5000Å was constant until June 2015 while the shortest wavelengths (U, B) indicate a new rise, similar to that seen for the FUor V2493 Cyg (HBC 722). Our near-infrared (NIR) monitoring between December 2014 and April 2015 shows a smaller outburst amplitude (∼2mag) and a smaller (0.2-0.3mag) post-outburst brightness decline. Optical and NIR color-magnitude diagrams indicate that the brightness decline is caused by growing extinction. The post-outburst light curves are modulated by an oscillating color-neutral pattern with a period of about 17 days and an amplitude declining from ∼0.08mag in October 2014 to ∼0.04mag in May 2015. The properties of the oscillating pattern lead us to suggest the presence of a close binary with eccentric orbit.