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.

Techniques: radial velocities

Planets and satellites: gaseous planets

Techniques: spectroscopic

Planetary systems

Planets and satellites: Atmospheres

Techniques: photometric

Author

J. Šubjak

Czech Academy of Sciences

European Southern Observatory (ESO)

Charles University

M. Endl

The University of Texas at Austin

Priyanka Chaturvedi

Thüringer Landessternwarte Tautenburg

R. Karjalainen

Czech Academy of Sciences

William D. Cochran

The University of Texas at Austin

M. Esposito

Thüringer Landessternwarte Tautenburg

D. Gandolfi

University of Turin

K. W.F. Lam

German Aerospace Center (DLR)

Technische Universität Berlin

Keivan G. Stassun

Fisk University

Vanderbilt University

Jirí Žák

European Southern Observatory (ESO)

N. Lodieu

Instituto de Astrofísica de Canarias

University of La Laguna

Henri M. J. Boffin

European Southern Observatory (ESO)

P. MacQueen

The University of Texas at Austin

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

University of Turin

Thüringer Landessternwarte Tautenburg

Jon M. Jenkins

NASA Ames Research Center

Judith Korth

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

Jack J. Lissauer

NASA Ames Research Center

J.H. Livingston

National Astronomical Observatory of Japan

University of Tokyo

National Institutes of Natural Sciences

R. Luque

Institute of Astrophysics of Andalusia (IAA)

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 A107

Subject Categories

Subatomic Physics

Analytical Chemistry

Astronomy, Astrophysics and Cosmology

DOI

10.1051/0004-6361/202142883

More information

Latest update

8/8/2022 1