PROTOPLANETARY DISK STRUCTURES IN OPHIUCHUS

We present the results of a high angular resolution (0farcs3 ≈ 40 AU) Submillimeter Array survey of the 345 GHz (870 mum) thermal continuum emission from nine of the brightest, and therefore most massive, circumstellar disks in the ~1 Myr-old Ophiuchus star-forming region. Using two-dimensional radiative transfer calculations, we simultaneously fit the observed continuum visibilities and broadband spectral energy distribution for each disk with a parametric structure model. Compared to previous millimeter studies, this survey includes significant upgrades in modeling, data quality, and angular resolution that provide improved constraints on key structure parameters, particularly those that characterize the…