Šubjak, J;
Endl, M;
Chaturvedi, P;
Karjalainen, R;
Cochran, WD;
Esposito, M;
Gandolfi, D;
... Kabáth, P; + view all
(2022)
TOI-1268b: The youngest hot Saturn-mass transiting exoplanet.
Astronomy & Astrophysics
, 662
, Article A107. 10.1051/0004-6361/202142883.
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Abstract
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 T_{eff} = 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 M_{p} = 96.4 ± 8.3 M_{⊕} and a radius of R_{p} = 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 10^{4.5–5.3}. When compared with the sample of other non-inflated Saturn-mass planets, TOI-1268b is one of the best candidates for transmission spectroscopy studies.
| Type: | Article |
|---|---|
| Title: | TOI-1268b: The youngest hot Saturn-mass transiting exoplanet |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1051/0004-6361/202142883 |
| Publisher version: | http://dx.doi.org/10.1051/0004-6361/202142883 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher's terms and conditions. |
| Keywords: | techniques: spectroscopic, techniques: radial velocities, techniques: photometric, planetary systems, planets and satellites: gaseous planets, planets and satellites: atmospheres |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10151989 |
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