Paper

Three Saturn-mass planets transiting F-type stars revealed with TESS and HARPS

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

2023

Overview

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.

• Publisher: Cornell University Library, arXiv.org
• Subject: Atmospheric composition / Extrasolar planets / F stars / Gas giant planets / Ground-based observation / Irradiation / K stars / Planet detection / Radial velocity / Saturn / Spectrographs / Transit