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Planet Hunters TESS I: TOI 813, a subgiant hosting a transiting Saturn-sized planet on an 84-day orbit

Monthly notices of the Royal Astronomical Society, 2020-05, Vol.494 (1), p.750-763 [Peer Reviewed Journal]

2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society 2020 ;Distributed under a Creative Commons Attribution 4.0 International License ;ISSN: 0035-8711 ;ISSN: 1365-2966 ;EISSN: 1365-2966 ;DOI: 10.1093/mnras/staa138

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Title:
Planet Hunters TESS I: TOI 813, a subgiant hosting a transiting Saturn-sized planet on an 84-day orbit
Author: Eisner, N L ; Barragán, O ; Aigrain, S ; Lintott, C ; Miller, G ; Zicher, N ; Boyajian, T S ; Briceño, C ; Bryant, E M ; Christiansen, J L ; Feinstein, A D ; Flor-Torres, L M ; Fridlund, M ; Gandolfi, D ; Gilbert, J ; Guerrero, N ; Jenkins, J M ; Jones, K ; Kristiansen, M H ; Vanderburg, A ; Law, N ; López-Sánchez, A R ; Mann, A W ; Safron, E J ; Schwamb, M E ; Stassun, K G ; Osborn, H P ; Wang, J ; Zic, A ; Ziegler, C ; Barnet, F ; Bean, S J ; Bundy, D M ; Chetnik, Z ; Dawson, J L ; Garstone, J ; Stenner, A G ; Huten, M ; Larish, S ; Melanson, L D ; Mitchell, T ; Moore, C ; Peltsch, K ; Rogers, D J ; Schuster, C ; Smith, D S ; Simister, D J ; Tanner, C ; Terentev, I ; Tsymbal, A
Subjects: Astrophysics ; Methods: statistical ; Planets and satellites: detection ; Sciences of the Universe ; Stars: fundamental parameters ; Stars: individual (TIC-55525572 - TOI 813)
Is Part Of: Monthly notices of the Royal Astronomical Society, 2020-05, Vol.494 (1), p.750-763
Description: ABSTRACT We report on the discovery and validation of TOI 813 b (TIC 55525572 b), 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 ($R_\star =1.94\, R_\odot$, $M_\star =1.32\, M_\odot$). 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 $2\, M_{\rm Jup}$ (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 $83.8911 _{ - 0.0031 } ^ { + 0.0027 }$ d, a planet radius of 6.71 ± 0.38 R⊕ and a semimajor axis of $0.423 _{ - 0.037 } ^ { + 0.031 }$ 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.
Publisher: Oxford University Press
Language: English
Identifier: ISSN: 0035-8711
ISSN: 1365-2966
EISSN: 1365-2966
DOI: 10.1093/mnras/staa138
Source: SWEPUB Freely available online

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Planet Hunters TESS I: TOI 813, a subgiant hosting a transiting Saturn-sized planet on an 84-day orbit

2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society 2020 ;Distributed under a Creative Commons Attribution 4.0 International License ;ISSN: 0035-8711 ;ISSN: 1365-2966 ;EISSN: 1365-2966 ;DOI: 10.1093/mnras/staa138

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