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The positional probability and true host star identification of TESS exoplanet candidates
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Hadjigeorghiou, Andreas and Armstrong, David J. (2024) The positional probability and true host star identification of TESS exoplanet candidates. Monthly Notices of the Royal Astronomical Society, 527 (2). 4018–-4030. doi:10.1093/mnras/stad3286 ISSN 0035-8711.
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Official URL: http://doi.org/10.1093/mnras/stad3286
Abstract
We present a method for deriving a probabilistic estimate of the true source of a detected TESS transiting event. Our method relies on comparing the observed photometric centroid offset for the target star with models of the offset that would occur if the event was either on the target or any of the Gaia identified nearby sources. The comparison is done probabilistically, allowing us to incorporate the uncertainties of the observed and modelled offsets in our result. The method was developed for TESS Full Frame Image lightcurves produced from the SPOC pipeline, but could be easily adapted to lightcurves from other sources. We applied the method on 3226 TESS Objects of Interest (TOIs), with a released lightcurve from SPOC. The method correctly identified 96.5% of 655 known exoplanet hosts as the most likely source of the eclipse. For 142 confirmed Nearby Eclipsing Binaries (NEBs) and Nearby Planet Candidates (NPCs), a nearby source was found to be the most likely in 96.5% of the cases. For 40 NEBs and NPCs where the true source is known, it was correctly designated as the most likely in 38 of those. Finally, for 2365 active planet candidates, the method suggests that 2072 are most likely on-target and 293 on a nearby source. The method forms a part of an in-development vetting and validation pipeline, called RAVEN, and is released as a standalone tool.
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): | Extrasolar planets -- Detection, Planets, Satellites | ||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||||
Publisher: | Oxford University Press | ||||||||||||
ISSN: | 0035-8711 | ||||||||||||
Official Date: | January 2024 | ||||||||||||
Dates: |
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Volume: | 527 | ||||||||||||
Number: | 2 | ||||||||||||
Page Range: | 4018–-4030 | ||||||||||||
DOI: | 10.1093/mnras/stad3286 | ||||||||||||
Status: | Peer Reviewed | ||||||||||||
Publication Status: | Published | ||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||
Date of first compliant deposit: | 30 October 2023 | ||||||||||||
Date of first compliant Open Access: | 30 October 2023 | ||||||||||||
RIOXX Funder/Project Grant: |
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