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Published August 10, 2014 | Submitted + Published
Journal Article Open

Comparison of the dust and gas radial structure in the transition disk [PZ99] J160421.7-213028


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.

Additional Information

© 2014 The American Astronomical Society. Received 2014 April 18; accepted 2014 June 25; published 2014 July 24. We thank Crystal Brogan and Steve Myers for their assistance with the data reduction. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This paper makes use of the following ALMA data: ADS/JAO.ALMA#2011.0.00526.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ. A.I. and J.M.C. acknowledge support from NSF awards AST-1109334 and AST-1140063. K.Z. and G.A.B. gratefully acknowledge funding provided by NSF award AST-1109857 and NASA grant NNX11AK86G.

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Published - 0004-637X_791_1_42.pdf

Submitted - 1406.6974.pdf


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