학술논문
TOI-1268b: the youngest, hot, Saturn-mass transiting exoplanet
Document Type
Working Paper
Author
Šubjak, J.; Endl, M.; Chaturvedi, P.; Karjalainen, R.; Cochran, W. D.; Esposito, M.; Gandolfi, D.; Lam, K. W. F.; Stassun, K.; Žák, J.; Lodieu, N.; Boffin, H. M. J.; MacQueen, P. J.; Hatzes, A.; Guenther, E. W.; Georgieva, I.; Grziwa, S.; Schmerling, H.; Skarka, M.; Blažek, M.; Karjalainen, M.; Špoková, M.; Isaacson, H.; Howard, A. W.; Burke, C. J.; Van Eylen, V.; 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, P.
Source
A&A 662, A107 (2022)
Subject
Language
Abstract
We report the discovery of TOI-1268b, a transiting Saturn-mass planet from the TESS space mission. With an age of less than one Gyr, derived from various age indicators, TOI-1268b is the youngest Saturn-mass planet known to date and contributes to the small sample of well characterised young planets. It has an orbital period of $P\,=\,8.1577080\pm0.0000044$ days, and transits an early K dwarf star with a mass of $M_\star$ = $ 0.96 \pm 0.04$ $M_{\odot}$, a radius of $R_\star$ = $ 0.92 \pm 0.06$ $R_{\odot}$, an effective temperature of $T_\mathrm{eff}\,=\,5300\pm100$ K, and a metallicity of $0.36\pm0.06$ dex. By combining TESS photometry with high-resolution spectra acquired with the Tull spectrograph at McDonald observatory, and the high-resolution spectrographs at Tautenburg and Ondrejov observatories, we measured a planetary mass of $M_\mathrm{p}\,=\,96.4 \pm 8.3\,M_{\oplus}$ and a radius of $R_\mathrm{p}\,=\,9.1 \pm 0.6\,R_{\oplus}$. TOI-1268 is an ideal system to study 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 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.
Comment: 21 pages, 17 figures, accepted for publication in Astronomy & Astrophysics; see independent work by Dong et al. for Rossiter-McLaughlin measurement of TOI-1268b
Comment: 21 pages, 17 figures, accepted for publication in Astronomy & Astrophysics; see independent work by Dong et al. for Rossiter-McLaughlin measurement of TOI-1268b