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We report the discovery of a warm sub-Saturn, TOI-257b (HD 19916b), based on data from NASAs Transiting Exoplanet Survey Satellite (TESS). The transit signal was detected by TESS and confirmed to be of planetary origin based on radial velocity observations. An analysis of the TESS photometry, the Minerva-Australis, FEROS, and HARPS radial velocities, and the asteroseismic data of the stellar oscillations reveals that TOI-257b has a mass of $M_P=0.138pm0.023$,$rm{M_J}$ ($43.9pm7.3$,$M_{rm oplus}$), a radius of $R_P=0.639pm0.013$,$rm{R_J}$ ($7.16pm0.15$,$R_{rm oplus}$), bulk density of $0.65^{+0.12}_{-0.11}$ (cgs), and period $18.38818^{+0.00085}_{-0.00084}$,$rm{days}$. TOI-257b orbits a bright ($mathrm{V}=7.612$,mag) somewhat evolved late F-type star with $M_*=1.390pm0.046$,$rm{M_{odot}}$, $R_*=1.888pm0.033$,$rm{R_{odot}}$, $T_{rm eff}=6075pm90$,$rm{K}$, and $vsin{i}=11.3pm0.5$,km,s$^{-1}$. Additionally, we find hints for a second non-transiting sub-Saturn mass planet on a $sim71$,day orbit using the radial velocity data. This system joins the ranks of a small number of exoplanet host stars ($sim100$) that have been characterized with asteroseismology. Warm sub-Saturns are rare in the known sample of exoplanets, and thus the discovery of TOI-257b is important in the context of future work studying the formation and migration history of similar planetary systems.
We present an independent discovery and detailed characterisation of K2-280b, a transiting low density warm sub-Saturn in a 19.9-day moderately eccentric orbit (e = 0.35_{-0.04}^{+0.05}) from K2 campaign 7. A joint analysis of high precision HARPS, H
We report the discovery of TOI-677 b, first identified as a candidate in light curves obtained within Sectors 9 and 10 of the Transiting Exoplanet Survey Satellite (TESS) mission and confirmed with radial velocities. TOI-677 b has a mass of M_p = 1.2
We announce the discovery of a microlensing planetary system, in which a sub-Saturn planet is orbiting an ultracool dwarf host. We detect the planetary system by analyzing the short-timescale ($t_{rm E}sim 4.4$~days) lensing event KMT-2018-BLG-0748.
We present the discovery of WASP-39b, a highly inflated transiting Saturn-mass planet orbiting a late G-type dwarf star with a period of $4.055259 pm 0.000008$,d, Transit Epoch T$_{0}=2455342.9688pm0.0002$,(HJD), of duration $0.1168 pm 0.0008$,d. A c
We report the discovery and characterization of HD 89345b (K2-234b; EPIC 248777106b), a Saturn-sized planet orbiting a slightly evolved star. HD 89345 is a bright star ($V = 9.3$ mag) observed by the K2 mission with one-minute time sampling. It exhib