The TOI-763 system: Sub-Neptunes orbiting a Sun-like star
Journal article, 2020
We report the discovery of a planetary system orbiting TOI-763(aka CD-39 7945), a V = 10.2, high proper motion G-type dwarf star that was photometrically monitored by the TESS space mission in Sector 10. We obtain and model the stellar spectrum and find an object slightly smaller than the Sun, and somewhat older, but with a similar metallicity. Two planet candidates were found in the light curve to be transiting the star. Combining TESS transit photometry with HARPS high-precision radial velocity (RV) follow-up measurements confirm the planetary nature of these transit signals. We determine masses, radii, and bulk densities of these two planets. A third planet candidate was discovered serendipitously in the RV data. The inner transiting planet, TOI-763 b, has an orbital period of Pb = 5.6 d, a mass of Mb = 9.8 ± 0.8 M⊕, and a radius of Rb = 2.37 ± 0.10 R⊕. The second transiting planet, TOI-763 c, has an orbital period of Pc = 12.3 d, a mass of Mc = 9.3 ± 1.0 M⊕, and a radius of Rc = 2.87 ± 0.11 R⊕. We find the outermost planet candidate to orbit the star with a period of ∼48 d. If confirmed as a planet, it would have a minimum mass of Md = 9.5 ± 1.6 M⊕. We investigated the TESS light curve in order to search for a mono transit by planet d without success. We discuss the importance and implications of this planetary system in terms of the geometrical arrangements of planets orbiting G-type stars.
planets and satellites: detection
planets and satellites: individual: TOI-763
planets and satellites: individual: TIC 178819686
Author
Malcolm Fridlund
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Leiden University
J.H. Livingston
University of Tokyo
D. Gandolfi
University of Turin
Carina Persson
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
K. W.F. Lam
Technische Universität Berlin
Keivan G. Stassun
Vanderbilt University
Coel Hellier
Keele University
Judith Korth
University of Cologne
A. Hatzes
Thüringer Landessternwarte Tautenburg
L. Malavolta
University of Padua
R. Luque
University of La Laguna
Instituto de Astrofísica de Canarias
S. Redfield
Wesleyan University
E. W. Guenther
Thüringer Landessternwarte Tautenburg
Simon Albrecht
Aarhus University
O. Barragán
University of Oxford
Serena Benatti
Istituto nazionale di astrofisica (INAF)
L. Bouma
Princeton University
J. Cabrera
German Aerospace Center (DLR)
William D. Cochran
The University of Texas at Austin
Szilard Csizmadia
German Aerospace Center (DLR)
Fei Dai
Princeton University
Massachusetts Institute of Technology (MIT)
H. Deeg
University of La Laguna
Instituto de Astrofísica de Canarias
M. Esposito
Thüringer Landessternwarte Tautenburg
Iskra Georgieva
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
S. Grziwa
University of Cologne
Luciá González-Cuesta
Instituto de Astrofísica de Canarias
University of La Laguna
T. Hirano
Tokyo Institute of Technology
Jon M. Jenkins
NASA Ames Research Center
Petr Kabath
Czech Academy of Sciences
E. Knudstrup
Aarhus University
D. W. Latham
Harvard-Smithsonian Center for Astrophysics
S. Mathur
Instituto de Astrofísica de Canarias
University of La Laguna
S. E. Mullally
Massachusetts Institute of Technology (MIT)
Norio Narita
University of Tokyo
Japan Science and Technology Agency
National Astronomical Observatory of Japan
Instituto de Astrofísica de Canarias
National Institutes of Natural Sciences
G. Nowak
Instituto de Astrofísica de Canarias
University of La Laguna
Henrik Olofsson
Chalmers, Space, Earth and Environment, Onsala Space Observatory
E. Palle
University of La Laguna
Instituto de Astrofísica de Canarias
Martin Pätzold
University of Cologne
E. Pompei
European Southern Observatory Santiago
H. Rauer
Freie Universität Berlin
Technische Universität Berlin
German Aerospace Center (DLR)
George R. Ricker
Massachusetts Institute of Technology (MIT)
F. Rodler
European Southern Observatory Santiago
S. Seager
Massachusetts Institute of Technology (MIT)
L. M. Serrano
University of Turin
Alexis M. S. Smith
German Aerospace Center (DLR)
L. Spina
ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D)
Monash University
J. Šubjak
Charles University
Czech Academy of Sciences
P. Tenenbaum
NASA Ames Research Center
Eric B. Ting
NASA Ames Research Center
A. Vanderburg
University of Wisconsin Madison
Roland K. Vanderspek
Massachusetts Institute of Technology (MIT)
Vincent Van Eylen
University College London (UCL)
S. Villanueva
Massachusetts Institute of Technology (MIT)
J. N. Winn
Princeton University
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 498 3 4503-4517Subject Categories
Subatomic Physics
Astronomy, Astrophysics and Cosmology
Other Physics Topics
DOI
10.1093/mnras/staa2502