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Kennedy, Grant M., Hope, Greg, Hodgkin, Simon T. and Wyatt, Mark C. (2019) An automated search for transiting exocomets. Monthly Notices of the Royal Astronomical Society, 482 (4). pp. 5587-5596. doi:10.1093/mnras/sty3049 ISSN 0035-8711.
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WRAP-automated-search-transiting-exocomets-Kennedy-2018.pdf - Accepted Version - Requires a PDF viewer. Download (1341Kb) | Preview |
Official URL: http://dx.doi.org/10.1093/mnras/sty3049
Abstract
This paper discusses an algorithm for detecting single transits in photometric time-series data. Specifically, we aim to identify asymmetric transits with ingress that is more rapid than egress, as expected for cometary bodies with a significant tail. The algorithm is automated, so can be applied to large samples and only a relatively small number of events need to be manually vetted. We applied this algorithm to all long cadence light curves from the Kepler mission, finding 16 candidate transits with significant asymmetry, 11 of which were found to be artefacts or symmetric transits after manual inspection. Of the 5 remaining events, four are the 0.1% depth events previously identified for KIC 3542116 and 11084727. We identify HD 182952 (KIC 8027456) as a third system showing a potential comet transit. All three stars showing these events have H-R diagram locations consistent with $\sim$100Myr-old open cluster stars, as might be expected given that cometary source regions deplete with age, and giving credence to the comet hypothesis. If these events are part of the same population of events as seen for KIC 8462852, the small increase in detections at 0.1% depth compared to 10% depth suggests that future work should consider whether the distribution is naturally flat, or if comets with symmetric transits in this depth range remain undiscovered. Future searches relying on asymmetry should be more successful if they focus on larger samples and young stars, rather than digging further into the noise.
| Item Type: | Journal Article | |||||||||
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| Subjects: | Q Science > QB Astronomy | |||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||
| Library of Congress Subject Headings (LCSH): | Comets, Time-series analysis, Algorithms | |||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||
| Publisher: | Oxford University Press | |||||||||
| ISSN: | 0035-8711 | |||||||||
| Official Date: | February 2019 | |||||||||
| Dates: |
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| Volume: | 482 | |||||||||
| Number: | 4 | |||||||||
| Page Range: | pp. 5587-5596 | |||||||||
| DOI: | 10.1093/mnras/sty3049 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Reuse Statement (publisher, data, author rights): | This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Grant M Kennedy, Greg Hope, Simon T Hodgkin, Mark C Wyatt; An automated search for transiting exocomets, Monthly Notices of the Royal Astronomical Society, , sty3049, https://doi.org/10.1093/mnras/sty3049 is available online at: https://doi.org/10.1093/mnras/sty3049 | |||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||
| Date of first compliant deposit: | 13 November 2018 | |||||||||
| Date of first compliant Open Access: | 13 November 2018 | |||||||||
| RIOXX Funder/Project Grant: |
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