CaltechAUTHORS
  A Caltech Library Service

ALMA Observations of Circumstellar Disks in the Upper Scorpius OB Association

Barenfeld, Scott A. and Carpenter, John M. and Ricci, Luca and Isella, Andrea (2016) ALMA Observations of Circumstellar Disks in the Upper Scorpius OB Association. Astrophysical Journal, 827 (2). Art. No. 142. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:20160819-074845949

[img] PDF - Published Version
See Usage Policy.

3235Kb
[img] PDF - Submitted Version
See Usage Policy.

2773Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20160819-074845949

Abstract

We present ALMA observations of 106 G-, K-, and M-type stars in the Upper Scorpius OB Association hosting circumstellar disks. With these data, we measure the 0.88 mm continuum and ^(12)CO J = 3–2 line fluxes of disks around low-mass (0.14–1.66 M⊙) stars at an age of 5–11 Myr. Of the 75 primordial disks in the sample, 53 are detected in the dust continuum and 26 in CO. Of the 31 disks classified as debris/evolved transitional disks, five are detected in the continuum and none in CO. The lack of CO emission in approximately half of the disks with detected continuum emission can be explained if CO is optically thick but has a compact emitting area (≾40 au), or if the CO is heavily depleted by a factor of at least ~1000 relative to interstellar medium abundances and is optically thin. The continuum measurements are used to estimate the dust mass of the disks. We find a correlation between disk dust mass and stellar host mass consistent with a power-law relation of M_(dust) ∝ M_*^(1.67 ± 0.37). Disk dust masses in Upper Sco are compared to those measured in the younger Taurus star-forming region to constrain the evolution of disk dust mass. We find that the difference in the mean of log(M_(dust)/M_*) between Taurus and Upper Sco is 0.64 ± 0.09, such that M dust/M_* is lower in Upper Sco by a factor of ~4.5.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.3847/0004-637X/827/2/142DOIArticle
http://iopscience.iop.org/article/10.3847/0004-637X/827/2/142/metaPublisherArticle
https://arxiv.org/abs/1605.05772arXivDiscussion Paper
Additional Information:© 2016 The American Astronomical Society. Received 2016 February 14; revised 2016 April 20; accepted 2016 May 17; published 2016 August 18. We thank the referee for useful comments, which improved this manuscript. We are grateful to Sean Andrews for his advice on the comparison of Upper Sco and Taurus disk masses, to Trevor David for valuable input on the age of Upper Sco, to Ivan Marti-Vidal for clarification regarding the use of uvmultifit, and to Nick Scoville for providing an original version of the aperture photometry code that was adapted for use in this work. We also thank the ALMA staff 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#2011.0.00966.S and ADS/JAO.ALMA#2013.1.00395.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. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This work is based [in part] on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NSFAST-1109334
NSFAST-1140063
NASA/JPL/CaltechUNSPECIFIED
Subject Keywords:open clusters and associations: individual (Upper Scorpius OB1) – protoplanetary disks – stars: premain sequence
Record Number:CaltechAUTHORS:20160819-074845949
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160819-074845949
Official Citation:Scott A. Barenfeld et al 2016 ApJ 827 142
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69764
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:22 Aug 2016 22:11
Last Modified:22 Aug 2016 22:11

Repository Staff Only: item control page