Dario Lorenzetti, Teresa Giannini
We present the WISE catalog of EXor sources and candidates more recently identified. This compilation is the first complete survey of such objects in the mid-IR (3.4 - 22 um) carried out with the same instrumentation. Two color diagrams constructed with WISE data evidence a clear segregation between classical and newly identified sources, being these latter characterized by colder (and less evolved) circumstellar disks. By combining 2MASS and WISE data, spectral energy distributions (SEDs) are obtained. Their behaviour substantially confirms the results based on WISE colors and offers some clue on the existence of an inner hole in the circumstellar disk. A compilation of all the EXor observations given in the literature at frequencies very similar to those of WISE is also provided: it allows us to search for the their mid-IR variability that has been so far poorly investigated without any coordination effort with shorter wavelengths surveys. The presented WISE catalog together with the compilation of the literature data are intended as a first step toward the contruction of a significant database in this spectral regime. Preliminary indications on the mechanisms responsible for the fluctuations are provided.
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http://arxiv.org/abs/1209.0485
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