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Published May 20, 2014 | Published + Submitted
Journal Article Open

An ALMA Continuum Survey of Circumstellar Disks in the Upper Scorpius OB Association


We present ALMA 880 μm continuum observations of 20 K- and M-type stars in the Upper Scorpius OB association (Upper Sco) that are surrounded by protoplanetary disks. These data are used to measure the dust content in disks around low-mass stars (0.1-1.6 M☉) at a stellar age of 5-11 Myr. Thirteen sources were detected in the 880 μm dust continuum at ≥ 3σ with inferred dust masses between 0.3 and 52 M⊕. The dust masses tend to be higher around the more massive stars, but the significance is marginal in that the probability of no correlation is p ≈ 0.03. The evolution in the dust content in disks was assessed by comparing the Upper Sco observations with published continuum measurements of disks around ~1-2 Myr stars in the Class II stage in the Taurus molecular cloud. While the dust masses in the Upper Sco disks are on average lower than in Taurus, any difference in the dust mass distributions is significant at less than 3σ. For stellar masses between 0.49 M☉ and 1.6 M☉, the mean dust mass in disks is lower in Upper Sco relative to Taurus by Δlog M_(dust) = 0.44 ± 0.26.

Additional Information

© 2014 The American Astronomical Society. Received 2013 December 31; accepted 2014 March 28; published 2014 May 2. We thank Crystal Brogan and Steve Myers for their assistance in 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. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation.

Attached Files

Published - 0004-637X_787_1_42.pdf

Submitted - 1404.0387v1.pdf


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