Publication details

TOI-1268b: The youngest hot Saturn-mass transiting exoplanet

Authors	ŠUBJAK J. ENDL M. CHATURVEDI P. KARJALAINEN R. COCHRAN W. D. ESPOSITO M. GANDOLFI D. LAM K. W. F. STASSUN K. ŽÁK Jiří LODIEU N. BOFFIN H. M. J. MACQUEEN P. J. HATZES A. GUENTHER E. W. GEORGIEVA I. GRZIWA S. SCHMERLING H. SKARKA Marek BLAŽEK Martin KARJALAINEN Marie ŠPOKOVÁ Magdalena ISAACSON H. HOWARD A. W. BURKE C. J. EYLEN V. Van FALK B. FRIDLUND M. GOFFO E. JENKINS J. M. KORTH J. LISSAUER J. J. LIVINGSTON J. H. LUQUE R. MURESAN A. OSBORN H. P. PALLÉ E. PERSSON C. M. REDFIELD S. RICKER G. R. SEAGER S. SERRANO L. M. SMITH A. M. S. KABÁTH Petr
Year of publication	2022
Type	Article in Periodical
Magazine / Source	Astronomy & Astrophysics
MU Faculty or unit	Faculty of Science
Citation
Web	https://arxiv.org/abs/2201.13341 https://www.aanda.org/articles/aa/full_html/2022/06/aa42883-21/aa42883-21.html
Doi	http://dx.doi.org/10.1051/0004-6361/202142883
Keywords	techniques: spectroscopic; techniques: radial velocities; techniques: photometric; planetary systems; planets and satellites: gaseous planets; planets and satellites: atmospheres
Description	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 Ondřejov Observatories, we measured a planetary mass of Mp = 96.4 ± 8.3 M? and a radius of Rp = 9.1 ± 0.6 R?. 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 planet’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.