Kavli Affiliate: Feng Long
| Summary:
We have performed Submillimeter Array (SMA) observations of 198.0-407.5 GHz broadband spectra of 10 Class II protoplanetary disks in the Taurus-Auriga region. The 337 GHz flux densities ($F_rm 337 GHz$) of these objects are in the range of 8.2-34 mJy. The median and standard deviation of the 198-358 GHz spectral indices ($α_198-358$) of these 10 Class II disks are 1.9 and 0.3, respectively. Compared to the recent, similar SMA survey on another 47 Class II disks that are brighter at (sub)millimeter bands ($F_rm 337 GHzsim$20-730 mJy), there is no evidence that these newly observed 10 fainter Class II disks have systematically different $α_198-358$ values. At $>$230 GHz frequencies, the optical depths of these 10 fainter Class II disks may be as high as those of the brighter sources, which may be $gtrsim$5. In addition, the low ($<$2.0) values of $α_198-358$ in some faint objects may be explained by the effect of dust self-scattering, with maximum dust grain size ($a_rm max$) $sim$ 100 $μ$m, or by contamination by free-free emission.
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