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


    Malbet, F. and Benisty, M. and Dougados, C. and Natta, A. and Le Bouquin, J.-P. and Massi, F. and Bouvier, J. and Grankin, K. and Bonnefoy, M. and Whelan, Emma (2010) The 2008-2009 outburst of the young binary system Z CMa unraveled by interferometry with high spectral resolution. Working Paper. arXiv.

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    Abstract

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

    Item Type: Monograph (Working Paper)
    Additional Information: Cite this version as: arXiv:1007.5382 [astro-ph.SR]. The final version of this article was published in the proceedings of the SPIE'2010 conference on "Optical and Infrared Interferometry II" https://doi.org/10.1117/12.857586
    Keywords: Astrophysics; Young star; Circumstellar Matter; Interferometry; Infrared; Outburst;
    Academic Unit: Faculty of Science and Engineering > Experimental Physics
    Item ID: 9936
    Identification Number: https://doi.org/10.1117/12.857586
    Depositing User: Emma Whelan
    Date Deposited: 17 Sep 2018 15:51
    Publisher: arXiv
    URI:

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