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A ∼75 per cent occurrence rate of debris discs around F stars in the β Pic moving group

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Pawellek, Nicole, Wyatt, Mark , Matrà, Luca, Kennedy, Grant M. and Yelverton, Ben (2021) A ∼75 per cent occurrence rate of debris discs around F stars in the β Pic moving group. Monthly Notices of the Royal Astronomical Society, 502 (4). pp. 5390-5416. doi:10.1093/mnras/stab269 ISSN 0035-8711.

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Official URL: http://dx.doi.org/10.1093/mnras/stab269

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Abstract

Only 20 per cent of old field stars have detectable debris discs, leaving open the question of what disc, if any, is present around the remaining 80 per cent. Young moving groups allow to probe this population, since discs are expected to have been brighter early on. This paper considers the population of F stars in the 23 Myr-old β Pictoris moving group (BPMG) where we find that 9/12 targets possess discs. We also analyse archival ALMA data to derive radii for four of the discs, presenting the first image of the 63 au radius disc of HD 164249. Comparing the BPMG results to disc samples from ∼45-Myr and ∼150-Myr-old moving groups, and to discs found around field stars, we find that the disc incidence rate in young moving groups is comparable to that of the BPMG and significantly higher than that of field stars. The BPMG discs tend to be smaller than those around field stars. However, this difference is not statistically significant due to the small number of targets. Yet, by analysing the fractional luminosity versus disc radius parameter space, we find that the fractional luminosities in the populations considered drop by two orders of magnitude within the first 100 Myr. This is much faster than expected by collisional evolution, implying a decay equivalent to 1/age2. We attribute this depletion to embedded planets, which would be around 170 Mearth to cause a depletion on the appropriate time-scale. However, we cannot rule out that different birth environments of nearby young clusters result in brighter debris discs than the progenitors of field stars that likely formed in a more dense environment.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Planetary systems, Protoplanetary disks, F stars
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press
ISSN: 0035-8711
Official Date: April 2021
Dates:
DateEvent
April 2021Published
2 February 2021Available
28 January 2021Accepted
Volume: 502
Number: 4
Page Range: pp. 5390-5416
DOI: 10.1093/mnras/stab269
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): 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 Nicole Pawellek, Mark Wyatt, Luca Matrà, Grant Kennedy, Ben Yelverton6, A ∼75 per cent occurrence rate of debris discs around F stars in the β Pic moving group, Monthly Notices of the Royal Astronomical Society, Volume 502, Issue 4, April 2021, Pages 5390–5416 is available online at: https://doi.org/10.1093/mnras/stab269
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 30 March 2021
Date of first compliant Open Access: 31 March 2021
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDRoyal Societyhttp://dx.doi.org/10.13039/501100000288
Open Access Version:
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