New constraints on the millimetre emission of six debris discs
Article
Article Title | New constraints on the millimetre emission of six debris discs |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Marshall, Jonathan P. (Author), Maddison, S. T. (Author), Thilliez, E. (Author), Matthews, B. C. (Author), Wilner, D. J. (Author), Greaves, J. S. (Author) and Holland, W. S. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 468 (3), pp. 2719-2725 |
Number of Pages | 7 |
Year | 2017 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stx645 |
Web Address (URL) | https://academic.oup.com/mnras/article/468/3/2719/3073705 |
Abstract | The presence of dusty debris around main-sequence stars denotes the existence of planetary systems. Such debris discs are often identified by the presence of excess continuum emission at infrared and (sub-)millimetre wavelengths, with measurements at longer wavelengths tracing larger and cooler dust grains. The exponent of the slope of the disc emission at submillimetre wavelengths, ‘q’, defines the size distribution of dust grains in the disc. This size distribution is a function of the rigid strength of the dust producing parent planetesimals. As a part of the survey ‘PLAnetesimals around TYpical Pre-main seqUence Stars’, we observed six debris discs at 9 mm using the Australian Telescope Compact Array. We obtain marginal (∼3σ) detections of three targets: HD 105, HD 61005 and HD 131835. Upper limits for the three remaining discs, HD 20807, HD 109573 and HD 109085 provide further constraint of the (sub-)millimetre slope of their spectral energy distributions. The values of q (or their limits) derived from our observations are all smaller than the oft-assumed steady-state collisional cascade model (q = 3.5), but lie well within the theoretically expected range for debris discs q ∼ 3–4. The measured q values for our targets are all <3.3, consistent with both collisional modelling results and theoretical predictions for parent planetesimal bodies being ‘rubble piles’ held together loosely by their self-gravity. |
Keywords | circumstellar matter, stars: individual: HD 105, stars: individual: HD 20807, stars: individual: HD 61005, stars: individual: HD 109085, stars: individual: HD 109573, stars: individual: HD 131835, planetary systems |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
519999. Other physical sciences not elsewhere classified | |
510101. Astrobiology | |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | Computational Engineering and Science Research Centre |
Swinburne University of Technology | |
University of Victoria, Canada | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Cardiff University, United Kingdom | |
Royal Observatory Edinburgh, United Kingdom | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q7753/new-constraints-on-the-millimetre-emission-of-six-debris-discs
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