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.
Methods: statistical
Planets and satellites: detection
Stars: individual (TIC-55525572 - TOI 813)
Stars: fundamental parameters
Författare
N. L. Eisner
University of Oxford
O. Barragán
University of Oxford
S. Aigrain
University of Oxford
C. Lintott
University of Oxford
G. Miller
University of Oxford
N. Zicher
University of Oxford
T. S. Boyajian
Louisiana State University
C. Briceño
Cerro Tololo Inter American Observatory
E. Bryant
The University of Warwick
J. L. Christiansen
National Aeronautics and Space Administration (NASA)
A. D. Feinstein
University of Chicago
L. M. Flor-Torres
Universidad de Guanajuato
Malcolm Fridlund
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
Universiteit Leiden
D. Gandolfi
Universita degli Studi di Torino
J. Gilbert
Australian National University
N. Guerrero
Massachusetts Institute of Technology (MIT)
Jon M. Jenkins
National Aeronautics and Space Administration (NASA)
K. Jones
University of Oxford
M. H. Kristiansen
Danmarks Tekniske Universitet (DTU)
A. Vanderburg
University of Texas
N. Law
The University of North Carolina System
A. R. López-Sánchez
Australian Astronomical Optics
Macquarie University
A. Mann
The University of North Carolina System
E. J. Safron
Louisiana State University
M. E. Schwamb
Queen's University Belfast
Gemini Observatory North
Keivan G. Stassun
Fisk University
Vanderbilt University
H. P. Osborn
Laboratoire d'Astrophysique de Marseille
J. Wang
Yale University
A. Zic
Commonwealth Scientific and Industrial Research Organisation (CSIRO)
The University of Sydney
C. Ziegler
University of Toronto
F. Barnet
Zooniverse
S. J. Bean
Zooniverse
D. M. Bundy
Zooniverse
Z. Chetnik
Zooniverse
J. L. Dawson
Zooniverse
J. Garstone
Zooniverse
A. G. Stenner
Zooniverse
M. Huten
Zooniverse
S. Larish
Zooniverse
L. D. Melanson
Zooniverse
T. Mitchell
Zooniverse
C. Moore
Zooniverse
K. Peltsch
Zooniverse
D. J. Rogers
Zooniverse
C. Schuster
Zooniverse
D. S. Smith
Zooniverse
D. J. Simister
Zooniverse
C. Tanner
Zooniverse
I. Terentev
Zooniverse
A. Tsymbal
Zooniverse
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