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Analysis of the Herschel DEBRIS sun-like star sample

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Sibthorpe, B., Kennedy, Grant M., Wyatt, M. C., Lestrade, J-F., Greaves, J. S., Matthews, B. C. and Duchêne, G. (2017) Analysis of the Herschel DEBRIS sun-like star sample. Monthly Notices of the Royal Astronomical Society, 475 (3). pp. 3046-3064. doi:10.1093/mnras/stx3188

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Official URL: http://dx.doi.org/10.1093/mnras/stx3188

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Abstract

This paper presents a study of circumstellar debris around Sun-like stars using data from the Herschel DEBRIS Key Programme. DEBRIS is an unbiased survey comprising the nearest ˜90 stars of each spectral type A-M. Analysis of the 275 F-K stars shows that excess emission from a debris disc was detected around 47 stars, giving a detection rate of 17.1^{+2.6}_{-2.3} per cent, with lower rates for later spectral types. For each target a blackbody spectrum was fitted to the dust emission to determine its fractional luminosity and temperature. The derived underlying distribution of fractional luminosity versus blackbody radius in the population showed that most detected discs are concentrated at f ˜ 10-5 and at temperatures corresponding to blackbody radii 7-40 au, which scales to ˜40 au for realistic dust properties (similar to the current Kuiper belt). Two outlying populations are also evident; five stars have exceptionally bright emission ( f > 5 × 10-5), and one has unusually hot dust <4 au. The excess emission distributions at all wavelengths were fitted with a steady-state evolution model, showing that these are compatible with all stars being born with a narrow belt that then undergoes collisional grinding. However, the model cannot explain the hot dust systems - likely originating in transient events - and bright emission systems - arising potentially from atypically massive discs or recent stirring. The emission from the present-day Kuiper belt is predicted to be close to the median of the population, suggesting that half of stars have either depleted their Kuiper belts (similar to the Solar system) or had a lower planetesimal formation efficiency.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Circumstellar matter, Herschel Space Observatory (Spacecraft)
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
ISSN: 1365-2966
Official Date: 11 December 2017
Dates:
DateEvent
11 December 2017Published
27 November 2017Accepted
Date of first compliant deposit: 5 June 2018
Volume: 475
Number: 3
Page Range: pp. 3046-3064
DOI: 10.1093/mnras/stx3188
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
279973European Research Council http://viaf.org/viaf/130022607
Research FellowshipRoyal Societyhttp://dx.doi.org/10.13039/501100000288
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