tokens: The authors thank Rachel Akeson, John Carpenter, Kevin Flaherty, Lynne Hillenbrand, Heather Knutson, Patrick Ogle, Inseok Song, Karl Stapelfeldt, and Barbara Whitney for their contributions to the YSOVAR project and valuable discussions on this work. H.Y.A.M. acknowledges support from the IPAC Visiting Graduate Research Fellowship program. P.P. acknowledges the work of Nancy Silbermann, William Mahoney, and the Spitzer scheduling team in scheduling the data volume-intensive observations, and thanks Greg Doppmann for providing the Keck/NIRSPEC spectrum. K.C. acknowledges support provided by the NSF through grant AST-1449476. A.M.W. thanks the staff of the Observatorio Astronómico Nacional in Sierra San Pedro Mártir. This work is based in part on observations made with the Spitzer Space Telescope , which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech. Facilities: CTIO:1.3 m , Mayall , OANSPM:HJT , SOAR , Spitzer (IRAC).
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