TOI-1268b: The youngest hot Saturn-mass transiting exoplanet
Journal article, 2022
We report the discovery of TOI-1268b, a transiting Saturn-mass planet from the TESS space mission. With an age of less than 1 Gyr, derived from various age indicators, TOI-1268b is the youngest Saturn-mass planet known to date; it contributes to the small sample of well-characterised young planets. It has an orbital period of P = 8.1577080 ± 0.0000044 days, and transits an early K-dwarf star with a mass of M∗ = 0.96 ± 0.04 M+, a radius of R∗ = 0.92 ± 0.06 R+, an effective temperature of Teff = 5300 ± 100 K, and a metallicity of 0.36 ± 0.06 dex. By combining TESS photometry with high-resolution spectra acquired with the Tull spectrograph at the McDonald Observatory, and the high-resolution spectrographs at the Tautenburg and OndR ejov Observatories, we measured a planetary mass of Mp = 96.4 ± 8.3 Mp and a radius of Rp = 9.1 ± 0.6 Rp. TOI-1268 is an ideal system for studying the role of star-planet tidal interactions for non-inflated Saturn-mass planets. We used system parameters derived in this paper to constrain the planeta's tidal quality factor to the range of 104.5-5.3. When compared with the sample of other non-inflated Saturn-mass planets, TOI-1268b is one of the best candidates for transmission spectroscopy studies.
Planets and satellites: Atmospheres
Planets and satellites: gaseous planets
Techniques: spectroscopic
Techniques: photometric
Planetary systems
Techniques: radial velocities
Author
J. Šubjak
Charles University
Czech Academy of Sciences
European Southern Observatory (ESO)
M. Endl
University of Texas
Priyanka Chaturvedi
Thüringer Landessternwarte Tautenburg
R. Karjalainen
Czech Academy of Sciences
William D. Cochran
University of Texas
M. Esposito
Thüringer Landessternwarte Tautenburg
D. Gandolfi
University of Turin
K. W.F. Lam
Technische Universität Berlin
German Aerospace Center (DLR)
Keivan G. Stassun
Vanderbilt University
Fisk University
Jirí Žák
European Southern Observatory (ESO)
N. Lodieu
University of La Laguna
Instituto de Astrofísica de Canarias
Henri M. J. Boffin
European Southern Observatory (ESO)
P. MacQueen
University of Texas
A. Hatzes
Thüringer Landessternwarte Tautenburg
E. W. Guenther
Thüringer Landessternwarte Tautenburg
Iskra Georgieva
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
S. Grziwa
University of Cologne
H. Schmerling
University of Cologne
Marek Skarka
Czech Academy of Sciences
M. Blažek
Czech Academy of Sciences
Masaryk University
M. Karjalainen
Czech Academy of Sciences
Magdalena Špoková
Czech Academy of Sciences
Masaryk University
H. Isaacson
University of California
A. W. Howard
California Institute of Technology (Caltech)
Christopher J. Burke
Massachusetts Institute of Technology (MIT)
Vincent Van Eylen
University College London (UCL)
B. Falk
Space Telescope Science Institute (STScI)
Malcolm Fridlund
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Leiden University
E. Goffo
Thüringer Landessternwarte Tautenburg
University of Turin
Jon M. Jenkins
National Aeronautics and Space Administration (NASA)
Judith Korth
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Jack J. Lissauer
National Aeronautics and Space Administration (NASA)
J.H. Livingston
University of Tokyo
National Institutes of Natural Sciences
National Astronomical Observatory of Japan
R. Luque
Spanish National Research Council (CSIC)
Alexandra Muresan
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
H. P. Osborn
Massachusetts Institute of Technology (MIT)
University of Bern
Enric Palle
University of La Laguna
Instituto de Astrofísica de Canarias
Carina Persson
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
S. Redfield
Wesleyan University
George R. Ricker
Massachusetts Institute of Technology (MIT)
S. Seager
Massachusetts Institute of Technology (MIT)
L. M. Serrano
University of Turin
Alexis M. S. Smith
German Aerospace Center (DLR)
Petr Kabath
Czech Academy of Sciences
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 662 A107Subject Categories (SSIF 2011)
Subatomic Physics
Analytical Chemistry
Astronomy, Astrophysics and Cosmology
DOI
10.1051/0004-6361/202142883