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1.	Eisner, N. L., et al. (author) Planet Hunters Tess I: TOI 813, a subgiant hosting a transiting Saturn-sized planet on an 84-day orbit 2020 In: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 494:1, s. 750-763 Research review (peer-reviewed)abstract 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.

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Type of publication: research review (1)

Type of content: peer-reviewed (1)

Author/Editor: Mann, A. (1); Wang, J. (1); Moore, C. (1); Christiansen, J. L. (1); Jones, K (1); Stassun, Keivan G. (1); show more...; Fridlund, Malcolm, 1 ... (1); Gandolfi, D. (1); Gilbert, J. (1); Barragán, O. (1); Aigrain, S. (1); Zicher, N. (1); Osborn, H. P. (1); Ziegler, C. (1); Schuster, C (1); Feinstein, A. D. (1); Miller, G (1); Bryant, E (1); Jenkins, Jon M. (1); Guerrero, N. (1); Briceño, C. (1); Law, N. (1); Mitchell, T (1); Boyajian, T. S. (1); Vanderburg, A. (1); Eisner, N. L. (1); Lintott, C. (1); Flor-Torres, L. M. (1); Kristiansen, M. H. (1); López-Sánchez, A. R. (1); Safron, E. J. (1); Schwamb, M. E. (1); Zic, A. (1); Barnet, F. (1); Bean, S. J. (1); Bundy, D. M. (1); Chetnik, Z. (1); Dawson, J. L. (1); Garstone, J. (1); Stenner, A. G. (1); Huten, M. (1); Larish, S. (1); Melanson, L. D. (1); Peltsch, K. (1); Rogers, D. J. (1); Smith, D. S. (1); Simister, D. J. (1); Tanner, C. (1); Terentev, I. (1); Tsymbal, A. (1); show less...

University: Chalmers University of Technology (1)

Language: English (1)

Research subject (UKÄ/SCB): Natural sciences (1)

Year: 2020 (1)

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