Comparison of the Dust and Gas Radial Structure in the Transition Disk [PZ99] J160421.7-213028
Abstract
We present ALMA observations of the 880 μm continuum and CO J = 3-2 line emission from the transition disk around [PZ99] J160421.7-213028, a solar mass star in the Upper Scorpius OB association. Analysis of the continuum data indicates that 80% of the dust mass is concentrated in an annulus extending between 79 and 114 AU in radius. Dust is robustly detected inside the annulus, at a mass surface density 100 times lower than that at 80 AU. The CO emission in the inner disk also shows a significantly decreased mass surface density, but we infer a cavity radius of only 31 AU for the gas. The large separation of the dust and gas cavity edges, as well as the high radial concentration of millimeter-sized dust grains, is qualitatively consistent with the predictions of pressure trap models that include hydrodynamical disk-planet interactions and dust coagulation/fragmentation processes.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- August 2014
- DOI:
- 10.1088/0004-637X/791/1/42
- arXiv:
- arXiv:1406.6974
- Bibcode:
- 2014ApJ...791...42Z
- Keywords:
-
- protoplanetary disks;
- stars: pre-main sequence;
- submillimeter: stars;
- Astrophysics - Earth and Planetary Astrophysics;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 11 pages, 8 figures, accepted by ApJ