TOI-733 b: A planet in the small-planet radius valley orbiting a Sun-like star
Journal article, 2023
We report the discovery of a hot (Teq ≈ 1055 K) planet in the small-planet radius valley that transits the Sun-like star TOI-733. It was discovered as part of the KESPRINT follow-up program of TESS planets carried out with the HARPS spectrograph. TESS photometry from sectors 9 and 36 yields an orbital period of {equation presented} days and a radius of {equation presented}. Multi-dimensional Gaussian process modelling of the radial velocity measurements from HARPS and activity indicators gives a semi-amplitude of K = 2.23 ± 0.26 m s-1, translating into a planet mass of {equation presented}. These parameters imply that the planet is of moderate density ({equation presented}) and place it in the transition region between rocky and volatile-rich planets with H/He-dominated envelopes on the mass-radius diagram. Combining these with stellar parameters and abundances, we calculated planet interior and atmosphere models, which in turn suggest that TOI-733 b has a volatile-enriched, most likely secondary outer envelope, and may represent a highly irradiated ocean world. This is one of only a few such planets around G-type stars that are well characterised.
Planets and satellites: individual: TOI-733
Planets and satellites: detection
Techniques: photometric
Techniques: radial velocities
Planets and satellites: composition
Author
Iskra Georgieva
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Carina Persson
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
E. Goffo
University of Turin
Thüringer Landessternwarte Tautenburg
L. Acuña
Laboratoire d'Astrophysique de Marseille
Max Planck Society
A. Aguichine
University of California
Laboratoire d'Astrophysique de Marseille
L. M. Serrano
University of Turin
K. W.F. Lam
German Aerospace Center (DLR)
D. Gandolfi
University of Turin
K. A. Collins
Harvard-Smithsonian Center for Astrophysics
S. B. Howell
National Aeronautics and Space Administration (NASA)
Fei Dai
California Institute of Technology (Caltech)
Malcolm Fridlund
Leiden University
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Judith Korth
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Lund University
M. Deleuil
Laboratoire d'Astrophysique de Marseille
O. Barragán
University of Oxford
William D. Cochran
The University of Texas at Austin
Szilárd Csizmadia
German Aerospace Center (DLR)
H. Deeg
University of La Laguna
Instituto de Astrofísica de Canarias
Eike W. Guenther
Thüringer Landessternwarte Tautenburg
A. Hatzes
Thüringer Landessternwarte Tautenburg
Jon M. Jenkins
National Aeronautics and Space Administration (NASA)
J. Livingston
National Institutes of Natural Sciences
National Astronomical Observatory of Japan
The Graduate University for Advanced Studies (SOKENDAI)
R. Luque
University of Chicago
O. Mousis
Laboratoire d'Astrophysique de Marseille
H. L.M. Osborne
University College London (UCL)
E. Palle
Instituto de Astrofísica de Canarias
S. Redfield
Wesleyan University
Vincent Van Eylen
University College London (UCL)
J. D. Twicken
National Aeronautics and Space Administration (NASA)
SETI Institute
J. N. Winn
Princeton University
A. Alqasim
University College London (UCL)
K. I. Collins
George Mason University
Crystal Gnilka
National Aeronautics and Space Administration (NASA)
D. W. Latham
Harvard-Smithsonian Center for Astrophysics
Hannah M. Lewis
Space Telescope Science Institute (STScI)
Howard M. Relles
Harvard-Smithsonian Center for Astrophysics
George R. Ricker
Massachusetts Institute of Technology (MIT)
Pamela Rowden
Piccadilly
S. Seager
Massachusetts Institute of Technology (MIT)
Avi Shporer
Massachusetts Institute of Technology (MIT)
Thiam Guan Tan
Perth Exoplanet Survey Telescope
A. Vanderburg
The University of Texas at Austin
University of Wisconsin Madison
Roland K. Vanderspek
Massachusetts Institute of Technology (MIT)
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 674 A117Exoplanets from space -CHEOPS and PLATO ESA's next two projects (Phase 2)
Swedish National Space Board (177/19), 2020-01-01 -- 2022-12-31.
Swedish National Space Board (65/19), 2020-01-01 -- 2022-12-31.
Subject Categories (SSIF 2011)
Astronomy, Astrophysics and Cosmology
DOI
10.1051/0004-6361/202345961