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A Significantly Low CO Abundance Toward the TW Hya Protoplanetary Disk: A Path to Active Carbon Chemistry?
Cécile Favre, L. Ilsedore Cleeves, Edwin A. Bergin +2
In this Letter we report the CO abundance relative to H2 derived toward the circumstellar disk of the T-Tauri star TW Hya from the HD (1-0) and C18O (2-1) emission lines. The HD (1…
Imaging of the CO Snow Line in a Solar Nebula Analog
Chunhua Qi, Karin I. Oberg, David J. Wilner +6
Planets form in the disks around young stars. Their formation efficiency and composition are intimately linked to the protoplanetary disk locations of "snow lines" of abundant vola…
A Spatially Resolved Vertical Temperature Gradient in the HD 163296 Disk
Katherine A. Rosenfeld, Sean M. Andrews, A. Meredith Hughes +2
We analyze sensitive, sub-arcsecond resolution ALMA Science Verification observations of CO emission lines in the protoplanetary disk hosted by the young, isolated Ae star HD 16329…
An Old Disk That Can Still Form a Planetary System
Edwin A. Bergin, L. Ilsedore Cleeves, Uma Gorti +11
From the masses of planets orbiting our Sun, and relative elemental abundances, it is estimated that at birth our Solar System required a minimum disk mass of ~0.01 solar masses wi…
First detection of c-C3H2 in a circumstellar disk
Chunhua Qi, Karin Oberg, David Wilner +1
We report the first detection of c-C3H2 in a circumstellar disk. The c-C3H2 J=6-5 line (217.882 GHz) is detected and imaged through Atacama Large Millimeter Array (ALMA) Science Ve…
H2CO and N2H+ in Protoplanetary Disks: Evidence for a CO-ice Regulated Chemistry
Chunhua Qi, Karin Oberg, David Wilner
We present Submillimeter Array observations of H2CO and N2H+ emission in the disks around the T Tauri star TW Hya and the Herbig Ae star HD 163296 at 2"-6" resolution and discuss t…