Three Saturn-mass planets transiting F-type stars revealed with TESS and HARPS
Creators: name: Psaridi, Angelica
name: Bouchy, François
name: Lendl, Monika
name: Akinsanmi, Babatunde
name: Stassun, Keivan G.
name: Smalley, Barry
name: Armstrong, David J.
name: Howard, Saburo
name: Ulmer-Moll, Solène
name: Grieves, Nolan
name: Barkaoui, Khalid
name: Rodriguez, Joseph E.
name: Bryant, Edward M.
name: Suárez, Olga
name: Guillot, Tristan
name: Evans, Phil
name: Attia, Omar
name: Wittenmyer, Robert A.
name: Yee, Samuel W.
name: Collins, Karen A.
name: Zhou, George
name: Galland, Franck
name: Parc, Léna
name: Udry, Stéphane
name: Figueira, Pedro
name: Ziegler, Carl
name: Mordasini, Christoph
name: Winn, Joshua N.
name: Seager, Sara
name: Jenkins, Jon M.
name: Twicken, Joseph D.
name: Brahm, Rafael
name: Jones, Matías I.
name: Abe, Lyu
name: Addison, Brett
name: Briceño, César
name: Briegal, Joshua T.
name: Collins, Kevin I.
name: Daylan, Tansu
name: Eigmüller, Phillip
name: Furesz, Gabor
name: Guerrero, Natalia M.
name: Hagelberg, Janis
name: Heitzmann, Alexis
name: Hounsell, Rebekah
name: Huang, Chelsea X.
name: Krenn, Andreas
name: Law, Nicholas M.
name: Mann, Andrew W.
name: McCormac, James
name: Mékarnia, Djamel
name: Mounzer, Dany
name: Nielsen, Louise D.
name: Osborn, Ares
name: Reinarz, Yared
name: Sefako, Ramotholo R.
name: Steiner, Michal
name: Strøm, Paul A.
name: Triaud, Amaury H. M. J.
name: Vanderspek, Roland
name: Vanzi, Leonardo
name: Vines, Jose I.
name: Watson, Christopher A.
name: Wright, Duncan J.
name: Zapata, Abner
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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 $\textit{JWST}$. 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.
description: 16 pages, 17 figures, submitted to A&amp;A