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

Carpenter, John M. and Ricci, Luca and Isella, Andrea (2014) An ALMA Continuum Survey of Circumstellar Disks in the Upper Scorpius OB Association. Astrophysical Journal, 787 (1). Art. No. 42. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:20140613-124218649

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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/1404.0387arXivArticle
http://dx.doi.org/10.1088/0004-637X/787/1/42 DOIArticle
http://iopscience.iop.org/0004-637X/787/1/42/PublisherArticle
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.
Funders:
Funding AgencyGrant Number
NSFAST-1109334
NSFAST-1140063
NASAUNSPECIFIED
Subject Keywords:open clusters and associations: individual (Upper Scorpius OB1); protoplanetary disks; stars: pre-main sequence
Record Number:CaltechAUTHORS:20140613-124218649
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140613-124218649
Official Citation:An ALMA Continuum Survey of Circumstellar Disks in the Upper Scorpius OB Association John M. Carpenter et al. 2014 ApJ 787 42
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46264
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:13 Jun 2014 21:06
Last Modified:13 Jun 2014 21:06

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