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Density profiles of isolated cores derived from thermal dust continuumemission rely on models of dust properties, such as mass opacity, which arepoorly constrained. With complementary measures from near-infrared extinctionmaps, we can assess the reliability of commonly-used dust models. In this work,we compare Herschel-derived maps of the optical depth with equivalent mapsderived from CFHT WIRCAM near-infrared observations for three isolated cores:CB68, L429, and L1552. We assess the dust opacities provided from four models:OH1a, OH5a, Orm1, and Orm4. Although the consistency of the models differsbetween the three sources, the results suggest that the optical properties ofdust in the envelopes of the cores are best described by either silicate andbare graphite grains (e.g., Orm1) or carbonaceous grains with some coagulationand either thin or no ice mantles (e.g., OH5a). None of the models, however,individually produced the most consistent optical depth maps for every source.The results suggest that either the dust in the cores is not well described byany one dust property model, the application of the dust models cannot beextended beyond the very center of the cores, or more complex SED fittingfunctions are necessary.

Constraining the Dust Opacity Law in Three Small and Isolated Molecular Clouds