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A statistically significant lack of debris discs in medium separation binary systems
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Yelverton , Ben M., Kennedy, Grant M., Su, Kate Y. L. and Wyatt, Mark C. (2019) A statistically significant lack of debris discs in medium separation binary systems. Monthly Notices of the Royal Astronomical Society . doi:10.1093/mnras/stz1927 (In Press)
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Official URL: http://dx.doi.org/10.1093/mnras/stz1927
Abstract
We compile a sample of 341 binary and multiple star systems with the aim of searching for and characterising Kuiper belt-like debris discs. The sample is assembled by combining several smaller samples studied in previously published work with targets from two unpublished Herschel surveys. We find that 38 systems show excess emission at 70 or 100 μm suggestive of a debris disc. While nine of the discs appear to be unstable to perturbations from their host binary based on a simple analysis of their inferred radii, we argue that the evidence for genuine instability is not strong, primarily because of uncertainty in the true disc radii, uncertainty in the boundaries of the unstable regions, and orbital projection effects. The binary separation distributions of the disc-bearing and disc-free systems are different at a confidence level of 99.4%, indicating that binary separation strongly influences the presence of detectable levels of debris. No discs are detected for separations between ̃25 and 135 au; this is likely a result of binaries whose separations are comparable with typical disc radii clearing out their primordial circumstellar or circumbinary material via dynamical perturbations. The disc detection rate is 19^{+5}_{-3}% for binaries wider than 135 au, similar to published results for single stars. Only 8^{+2}_{-1}% of systems with separations below 25 au host a detectable disc, which may suggest that planetesimal formation is inhibited in binaries closer than a few tens of au, similar to the conclusions of studies of known planet-hosting binaries.
| Item Type: | Journal Article | |||||||||
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| Subjects: | Q Science > QB Astronomy | |||||||||
| Divisions: | Faculty of Science > Physics | |||||||||
| Library of Congress Subject Headings (LCSH): | Circumstellar matter, Double stars | |||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||
| Publisher: | Oxford University Press | |||||||||
| ISSN: | 1745-3933 | |||||||||
| Official Date: | 11 July 2019 | |||||||||
| Dates: |
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| Date of first compliant deposit: | 29 July 2019 | |||||||||
| DOI: | 10.1093/mnras/stz1927 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | In Press | |||||||||
| Publisher Statement: | This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Ben Yelverton, Grant M Kennedy, Kate Y L Su, Mark C Wyatt, A statistically significant lack of debris discs in medium separation binary systems, Monthly Notices of the Royal Astronomical Society, , stz1927, https://doi.org/10.1093/mnras/stz1927 is available online at: http://dx.doi.org/10.1093/mnras/stz1927 | |||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||
| RIOXX Funder/Project Grant: |
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