An unbiased study of debris discs around A-type stars with Herschel
Article
Article Title | An unbiased study of debris discs around A-type stars with Herschel |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Thureau, N. D. (Author), Greaves, J. S. (Author), Matthews, B. C. (Author), Kennedy, G. (Author), Phillips, N. (Author), Booth, M. (Author), Duchene, G. (Author), Horner, J. (Author), Rodriguez, D. R. (Author), Sibthorpe, B. (Author) and Wyatt, M. C. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 445 (3), pp. 2558-2573 |
Number of Pages | 16 |
Year | 2014 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stu1864 |
Web Address (URL) | https://academic.oup.com/mnras/article/445/3/2558/1040878 |
Abstract | The Herschel DEBRIS (Disc Emission via a Bias-free Reconnaissance in the Infrared/Submillimetre) survey brings us a unique perspective on the study of debris discs around main-sequence A-type stars. Bias-free by design, the survey offers a remarkable data set with which to investigate the cold disc properties. The statistical analysis of the 100 and 160 μm data for 86 main-sequence A stars yields a lower than previously found debris disc rate. Considering better than 3σ excess sources, we find a detection rate ≥24 ± 5 per cent at 100 μm which is similar to the debris disc rate around main-sequence F/G/K-spectral type stars. While the 100 and 160 μm excesses slowly decline with time, debris discs with large excesses are found around some of the oldest A stars in our sample, evidence that the debris phenomenon can survive throughout the length of the main sequence (˜1 Gyr). Debris discs are predominantly detected around the youngest and hottest stars in our sample. Stellar properties such as metallicity are found to have no effect on the debris disc incidence. Debris discs are found around A stars in single systems and multiple systems at similar rates. While tight and wide binaries (<1 and >100 au, respectively) host debris discs with a similar frequency and global properties, no intermediate separation debris systems were detected in our sample. |
Keywords | surveys, binaries: general, circumstellar matter, stars: individual: A-stars, infrared: stars |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | University of St Andrews, United Kingdom |
Herzberg Astronomy and Astrophysics Centre, Canada | |
University of Cambridge, United Kingdom | |
Atacama Large Millimetre Array, Chile | |
University of Victoria, Canada | |
University of California, United States | |
University of New South Wales | |
University of Chile, Chile | |
Netherlands Institute for Space Research, Netherlands | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q2x0w/an-unbiased-study-of-debris-discs-around-a-type-stars-with-herschel
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