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Understanding disk evolution and dissipation is essential for studies ofplanet formation. Transition disks, i.e., disks with large dust cavities andgaps, are promising candidates of active evolution. About two dozenSED-selected candidates have been confirmed to have dust cavities throughmillimeter interferometric imaging, but this sample is biased towards thebrightest disks. The Spitzer surveys of nearby low-mass star forming regionshave resulted in more than 4000 Young Stellar Objects (YSOs). Using colorcriteria we have selected a sample of ~150 candidates, and an additional 40candidates and known transition disks from the literature. The Spitzer datawere complemented by new observations at longer wavelengths, including new JCMTand APEX submillimeter photometry, and WISE and Herschel-PACS mid andfar-infrared photometry. Furthermore, optical spectroscopy was obtained andstellar types were derived for 85% of the sample, including information fromthe literature. The SEDs were fit to a grid of RADMC-3D disk models with alimited number of parameters: disk mass, inner disk mass, scale height andflaring, and disk cavity radius, where the latter is the main parameter ofinterest. A large fraction of the targets possibly have dust cavities based onthe SED. The derived cavity sizes are consistent with imaging/modeling resultsin the literature, where available. Trends are found with Ldisk/Lstar andstellar mass and a possible connection with exoplanet orbital radii. Acomparison with a previous study where color observables are used (Cieza et al.2010) reveals large overlap between their category of planet-forming disks andour transition disks with cavities. A large number of the new transition diskcandidates are suitable for follow-up observations with ALMA.

The (w)hole survey: an unbiased sample study of transition disk candidates based on Spitzer catalogs