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We have used the Submillimeter Array to image, at ~1" resolution, C2H(3-2)emission from the molecule-rich circumstellar disks orbiting the nearby,classical T Tauri star systems TW Hya and V4046 Sgr. The SMA imaging revealsthat the C2H emission exhibits a ring-like morphology within each disk, theinner hole radius of the C2H ring within the V4046 Sgr disk (~70 AU) issomewhat larger than than of its counterpart within the TW Hya disk (~45 AU).We suggest that, in each case, the C2H emission likely traces irradiation ofthe tenuous surface layers of the outer disks by high-energy photons from thecentral stars.

Rings of C2H in the Molecular Disks Orbiting TW Hya and V4046 Sgr