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We present new EVLA continuum observations at 7 mm of the 253-1536 binarydisk system in the Orion Nebula Cluster. The measured fluxes were combined withdata in the sub-mm to derive the millimeter spectral index of each individualdisk component. We show how these observations can be used to test the modelsof dust evolution and early growth of solids in protoplanetary disks. Ouranalysis indicates that the disk with lower density and higher temperaturehosts larger grains than the companion disk. This result is the opposite ofwhat predicted by the dust evolution models. The models and observationalresults can be reconciled if the viscosity $\alpha$-parameter differs by morethan a factor of ten in the two disks, or if the distribution of solids in thedisks is strongly affected by radial motions. This analysis can be applied tofuture high-angular resolution observations of young disks with EVLA and ALMAto provide even stronger observational constraints to the models of dustevolution in protoplanetary disks.

The mm-colors of a young binary disk system in the Orion Nebula Cluster