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We report the discovery of TOI-1268b, a transiting Saturn-mass planet fromthe TESS space mission. With an age of less than one Gyr, derived from variousage indicators, TOI-1268b is the youngest Saturn-mass planet known to date andcontributes to the small sample of well characterised young planets. It has anorbital period of $P\,=\,8.1577080\pm0.44$ days, and transits an early Kdwarf 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. Bycombining TESS photometry with high-resolution spectra acquired with the Tullspectrograph at McDonald observatory, and the high-resolution spectrographs atTautenburg 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 tostudy the role of star-planet tidal interactions for non-inflated Saturn-massplanets. We used system parameters derived in this paper to constrain theplanet tidal quality factor to the range of $10^{4.5-5.3}$. When compared withthe sample of other non-inflated Saturn-mass planets, TOI-1268b is one of thebest candidates for transmission spectroscopy studies.

TOI-1268b: the youngest, hot, Saturn-mass transiting exoplanet