Jonathan P. Williams
A SCUBA-2 850-μm survey of protoplanetary discs in the σ Orionis cluster
Williams, Jonathan P.; Cieza, Lucas A.; Andrews, Sean M.; Coulson, Iain M.; Barger, Amy J.; Casey, Caitlin M.; Chen, Chian-Chou; Cowie, Lennox L.; Koss, Michael; Lee, Nicholas; Sanders, David B.
Authors
Lucas A. Cieza
Sean M. Andrews
Iain M. Coulson
Amy J. Barger
Caitlin M. Casey
Chian-Chou Chen
Lennox L. Cowie
Michael Koss
Nicholas Lee
David B. Sanders
Abstract
We present the results from a large 850-μm survey of the σ Orionis cluster using the SCUBA-2 camera on the James Clerk Maxwell Telescope. The 0 ∘.5 diameter circular region we surveyed contains 297 young stellar objects with an age estimated at about 3 Myr. We detect nine of these objects, eight of which have infrared excesses from an inner disc. We also serendipitously detect three non-stellar sources at >5σ that are likely background submillimetre galaxies. The nine detected stars have inferred disc masses ranging from 5 to about 17 MJup, assuming similar dust properties as Taurus discs and an interstellar medium gas-to-dust ratio of 100. There is a net positive signal towards the positions of the individually undetected infrared excess sources indicating a mean disc mass of 0.5 MJup. Stacking the emission towards those stars without infrared excesses constrains their mean disc mass to less than 0.3 MJup, or an equivalent Earth mass in dust. The submillimetre luminosity distribution is significantly different from that in the younger Taurus region, indicating disc mass evolution as star-forming regions age and the infrared excess fraction decreases. Submillimetre Array observations reveal CO emission towards four sources demonstrating that some, but probably not much, molecular gas remains in these relatively evolved discs. These observations provide new constraints on the dust and gas mass of protoplanetary discs during the giant planet building phase and provide a reference level for future studies of disc evolution.
Citation
Williams, J. P., Cieza, L. A., Andrews, S. M., Coulson, I. M., Barger, A. J., Casey, C. M., …Sanders, D. B. (2013). A SCUBA-2 850-μm survey of protoplanetary discs in the σ Orionis cluster. Monthly Notices of the Royal Astronomical Society, 435(2), 1671-1679. https://doi.org/10.1093/mnras/stt1407
Journal Article Type | Article |
---|---|
Publication Date | Aug 1, 2013 |
Deposit Date | Oct 3, 2014 |
Publicly Available Date | Oct 10, 2014 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 435 |
Issue | 2 |
Pages | 1671-1679 |
DOI | https://doi.org/10.1093/mnras/stt1407 |
Keywords | Protoplanetary discs, Submillimetre: stars. |
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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2013 The Authors Published by Oxford University Press on behalf of The Royal Astronomical Society. All rights reserved.
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