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
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