Kavli Affiliate: Gabor Furesz
| Summary:
While the sample of confirmed exoplanets continues to increase, the population of transiting exoplanets around early-type stars is still limited. These planets allow us to investigate the planet properties and formation pathways over a wide range of stellar masses and study the impact of high irradiation on hot Jupiters orbiting such stars. We report the discovery of TOI-615b, TOI-622b, and TOI-2641b, three Saturn-mass planets transiting main sequence, F-type stars. The planets were identified by the Transiting Exoplanet Survey Satellite (TESS) and confirmed with complementary ground-based and radial velocity observations. TOI-615b is a highly irradiated ($sim$1277 $F_oplus$) and bloated Saturn-mass planet (1.69$^+0.05_-0.06$$R_Jup$ and 0.43$^+0.09_-0.08$$M_Jup$) in a 4.66 day orbit transiting a 6850 K star. TOI-622b has a radius of 0.82$^+0.03_-0.03$$R_Jup$ and a mass of 0.30$^+0.07_-0.08$~$M_Jup$ in a 6.40 day orbit. Despite its high insolation flux ($sim$600 $F_oplus$), TOI-622b does not show any evidence of radius inflation. TOI-2641b is a 0.39$^+0.02_-0.04$$M_Jup$ planet in a 4.88 day orbit with a grazing transit (b = 1.04$^+0.05_-0.06 $) that results in a poorly constrained radius of 1.61$^+0.46_-0.64$$R_Jup$. Additionally, TOI-615b is considered attractive for atmospheric studies via transmission spectroscopy with ground-based spectrographs and $textitJWST$. Future atmospheric and spin-orbit alignment observations are essential since they can provide information on the atmospheric composition, formation and migration of exoplanets across various stellar types.
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