New constraints on the millimetre emission of six debris discs

Article


Marshall, Jonathan P., Maddison, S. T., Thilliez, E., Matthews, B. C., Wilner, D. J., Greaves, J. S. and Holland, W. S.. 2017. "New constraints on the millimetre emission of six debris discs." Monthly Notices of the Royal Astronomical Society. 468 (3), pp. 2719-2725. https://doi.org/10.1093/mnras/stx645
Article Title

New constraints on the millimetre emission of six debris discs

ERA Journal ID1074
Article CategoryArticle
AuthorsMarshall, 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 TitleMonthly Notices of the Royal Astronomical Society
Journal Citation468 (3), pp. 2719-2725
Number of Pages7
Year2017
PublisherOxford University Press
Place of PublicationUnited Kingdom
ISSN0035-8711
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.

Keywordscircumstellar 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 2020510109. 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 AffiliationsComputational 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 OriginUniversity of Southern Queensland
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Horner, J., Hinse, T. C., Wittenmyer, R. A., Marshall, J. P. and Tinney, C. G.. 2012. "A dynamical analysis of the proposed circumbinary HWVirginis planetary system." Monthly Notices of the Royal Astronomical Society. 427 (4), pp. 2812-2823. https://doi.org/10.1111/j.1365-2966.2012.22046.x
A detailed dynamical investigation of the proposed QS Virginis planetary system
Horner, J., Wittenmyer, R. A., Hinse, T. C., Marshall, J. P., Mustill, A. J. and Tinney, C. G.. 2013. "A detailed dynamical investigation of the proposed QS Virginis planetary system." Monthly Notices of the Royal Astronomical Society. 435 (3), pp. 2033-2039. https://doi.org/10.1093/mnras/stt1420