A WISE Survey of Circumstellar Disks in the Upper Scorpius Association
AffiliationUniv Arizona, Steward Observ
Keywordsaccretion, accretion disks
stars: pre-main sequence
MetadataShow full item record
PublisherIOP PUBLISHING LTD
CitationT. L. Esplin et al 2018 AJ 156 75
Rights© 2018. The American Astronomical Society. All rights reserved.
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AbstractWe have performed a survey for new members of the Upper Sco association that have circumstellar disks using mid-infrared photometry from the Wide-field Infrared Survey Explorer (WISE). Through optical and near-infrared spectroscopy, we have confirmed 185 candidates as likely members of Upper Sco with spectral types ranging from mid-K to M9. They comprise similar to 36% of the known disk-bearing members of the association. We also have compiled all available mid-infrared photometry from WISE and the Spitzer Space Telescope for the known members of Upper Sco, resulting in a catalog of data for 1608 objects. We have used these data to identify the members that exhibit excess emission from disks and we have classified the evolutionary stages of those disks with criteria similar to those applied in our previous studies of Taurus and Upper Sco. Among 484 members with excesses in at least one band (excluding five Be stars), we classify 296 disks as full, 66 as evolved, 19 as transitional, 22 as evolved or transitional, and 81 as evolved transitional or debris. Many of these disks have not been previously reported, including 129 full disks and 50 disks that are at more advanced evolutionary stages.
VersionFinal published version
SponsorsNASA Astrophysics Data Analysis Program [NNX12AI58G]; NASA NExSS program; NASA [NNH14CK55B]; NSF; U.S. Government [NAG W-2166]; Pennsylvania State University; Eberly College of Science; Pennsylvania Space Grant Consortium