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Z CMa is a young binary system consisting of an Herbig primary and a FU Oricompanion. Both components seem to be surrounded by active accretion disks anda jet was associated to the Herbig B0. In Nov. 2008, K. Grankin discovered thatZ CMa was exhibiting an outburst with an amplitude larger than any photometricvariations recorded in the last 25 years. To study the innermost regions inwhich the outburst occurs and understand its origin, we have observed bothbinary components with AMBER/VLTI across the Br{\gamma} emission line in Dec.2009 in medium and high spectral resolution modes. Our observations show thatthe Herbig Be, responsible for the increase of luminosity, also produces astrong Br{\gamma} emission, and they allow us to disentangle from variousorigins by locating the emission at each velocities through the line.Considering a model of a Keplerian disk alone fails at reproducing theasymmetric spectro-astrometric measurements, suggesting a major contributionfrom an outflow.

The 2008-2009 outburst of the young binary system Z CMa unraveled by interferometry with high spectral resolution