Planet Hunters TESS I: TOI 813, a subgiant hosting a transiting Saturn-sized planet on an 84-day orbit
Autor: | T. Mitchell, Keivan G. Stassun, Z. Chetnik, C. Schuster, J. L. Christiansen, David S. Smith, Megan E. Schwamb, Frank Barnet, J. Garstone, Tabetha S. Boyajian, Ivan Terentev, Cesar Briceno, Nora L. Eisner, Angel R. Lopez-Sanchez, S. Larish, Andrew Vanderburg, Chris Lintott, C. Moore, Hugh P. Osborn, S. J. Bean, Jon M. Jenkins, Martti H. Kristiansen, L. D. Melanson, J. L. Dawson, N. Zicher, Suzanne Aigrain, Emily J. Safron, K. Peltsch, D. M. Bundy, Natalia Guerrero, L. M. Flor-Torres, Dean Joseph Simister, Oscar Barragán, James Gilbert, A. Tsymbal, Ji Wang, K. Jones, D. J. Rogers, Grant Miller, Davide Gandolfi, Marc Huten, Christopher Tanner, A. G. Stenner, Edward M. Bryant, C. Ziegler, Andrew W. Mann, Andrew Zic, Nicholas M. Law, Adina D. Feinstein, Malcolm Fridlund |
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Přispěvatelé: | Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS) |
Rok vydání: | 2020 |
Předmět: |
statistical [Methods]
planets and satellites: detection 010504 meteorology & atmospheric sciences TOI 813) stars: individual (TIC-55525572 FOS: Physical sciences fundamental parameters [Stars] 01 natural sciences Planet Saturn 0103 physical sciences individual (TIC-55525572 [stars] Transit (astronomy) 010303 astronomy & astrophysics 0105 earth and related environmental sciences Earth and Planetary Astrophysics (astro-ph.EP) Physics methods: statistical [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] Subgiant Astronomy Astronomy and Astrophysics Orbital period Light curve Exoplanet detection [Planets and satellites] Orbit Stars: individual (TIC-55525572 - TOI 813) [SDU]Sciences of the Universe [physics] 13. Climate action Space and Planetary Science Methods: statistical Planets and satellites: detection Stars: fundamental parameters stars: fundamental parameters individual (TIC-55525572 TOI 813) [Stars] Astrophysics - Earth and Planetary Astrophysics |
Zdroj: | Monthly Notices of the Royal Astronomical Society Monthly Notices of the Royal Astronomical Society, 2020, 494, pp.750-763. ⟨10.1093/mnras/staa138⟩ 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 2020, ' 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, vol. 494, no. 1, pp. 750–763 . https://doi.org/10.1093/mnras/staa138 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 2020, ' 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, vol. 494, no. 1, pp. 750-763 . https://doi.org/10.1093/mnras/staa138 Monthly Notices of the RAS (0035-8711), 494(1), 750-763 |
ISSN: | 1365-2966 0035-8711 |
DOI: | 10.1093/mnras/staa138 |
Popis: | We report on the discovery and validation of TOI 813b (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 $2 M_{Jup}$ (99 % confidence) on the mass of the companion, and to statistically validate its planetary nature. Detailed modelling of the transits yields a period of $83.8911_{ - 0.0031 } ^ { + 0.0027 }$ days, a planet radius of $6.71 \pm 0.38$ $R_{\oplus}$, and a semi major 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 under-explored region of parameter space. We estimate that TOI-813b induces a reflex motion in its host star with a semi-amplitude of $\sim6$ ms$^{-1}$, making this system a promising target to measure the mass of a relatively long-period transiting planet. Accepted for publication in MNRAS (16 pages, 10 figures, 3 tables) |
Databáze: | OpenAIRE |
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