Planet Hunters Tess I: TOI 813, a subgiant hosting a transiting Saturn-sized planet on an 84-day orbit
Reviewartikel, 2020
We report on the discovery and validation of TOI 813 b (TIC55525572b), a transiting exoplanet identified by citizen scientists in data from NASA's Transiting Exoplanet Survey Satellite (TESS) and the first planet discovered by the Planet Hunters TESS project. The host star is a bright (V = 10.3 mag) subgiant (R* = 1.94 R☉, M☉ = 1.32 M☉). It was observed almost continuously by TESS during its first year of operations, during which time four individual transit events were detected. The candidate passed all the standard light curve-based vetting checks, and ground-based follow-up spectroscopy and speckle imaging enabled us to place an upper limit of 2 MJup (99 per cent confidence) on the mass of the companion, and to statistically validate its planetary nature. Detailed modelling of the transits yields a period of 83.8911+0.0027-0.0031 d, a planet radius of 6.71 ± 0.38 R⊕ and a semimajor axis of 0.423+0031-0.037 AU. The planet's orbital period combined with the evolved nature of the host star places this object in a relatively underexplored region of parameter space. We estimate that TOI 813 b induces a reflex motion in its host star with a semi-amplitude of ∼6 m s−1, making this a promising system to measure the mass of a relatively long-period transiting planet.
Stars: fundamental parameters
Methods: statistical
Planets and satellites: detection
Stars: individual (TIC-55525572 - TOI 813)
Författare
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University of Oxford
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University of Oxford
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University of Oxford
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University of Oxford
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University of Oxford
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University of Oxford
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Louisiana State University
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Cerro Tololo Inter American Observatory
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The University of Warwick
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National Aeronautics and Space Administration (NASA)
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Universiteit Leiden
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
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Universita degli Studi di Torino
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Australian National University
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Massachusetts Institute of Technology (MIT)
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National Aeronautics and Space Administration (NASA)
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University of Oxford
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Australian Astronomical Optics
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Yale University
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Commonwealth Scientific and Industrial Research Organisation (CSIRO)
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Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 494 1 750-763Ämneskategorier (SSIF 2011)
Subatomär fysik
Astronomi, astrofysik och kosmologi
Geofysik
DOI
10.1093/mnras/staa138