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

A. Psaridi, F. Bouchy, M. Lendl, B. Akinsanmi, K. G. Stassun, B. Smalley, D. J. Armstrong, S. Howard, S. Ulmer-Moll, N. Grieves, K. Barkaoui, J. E. Rodriguez, E. M. Bryant, O. Suárez, T. Guillot, P. Evans, O. Attia, R. A. Wittenmyer, S. W. Yee, K. A. Collins, G. Zhou, F. Galland, L. Parc, S. Udry, P. Figueira, C. Ziegler, C. Mordasini, J. N. Winn, S. Seager, J. M. Jenkins, J. D. Twicken, R. Brahm, M. I. Jones, L. Abe, B. C. Addison, C. Briceño, J. T. Briegal, K. I. Collins, T. Daylan, P. Eigmüller, G. Furesz, N. M. Guerrero, J. Hagelberg, A. Heitzmann, R. Hounsell, C. X. Huang, A. Krenn, N. M. Law, A. W. Mann, J. McCormac, D. Mékarnia, D. Mounzer, L. D. Nielsen, A. Osborn, Y. Reinarz, R. R. Sefako, M. Rosensteiner, P. A. Strøm, A. H. M. J. Triaud, R. K. Vanderspek, L. Vanzi, J. I. Vines, C. A. Watson, D. J. Wright, A. Zapata

While the sample of confirmed exoplanets continues to grow, 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 (~1277 F) and bloated Saturn-mass planet (1.69−0.06+0.05 RJup and 0.43−0.08+0.09 MJup) in a 4.66 day orbit transiting a 6850 K star. TOI-622b has a radius of 0.82−0.03+0.03 RJup and a mass of 0.30−0.08+0.07 MJup in a 6.40 day orbit. Despite its high insolation flux (~600 F), TOI-622b does not show any evidence of radius inflation. TOI-2641b is a 0.39−0.04+0.02 MJup planet in a 4.88 day orbit with a grazing transit (b = 1.04−0.06+0.05) that results in a poorly constrained radius of 1.61−0.64+0.46 RJup. Additionally, TOI-615b is considered attractive for atmospheric studies via transmission spectroscopy with ground-based spectrographs and 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.

planets and satellites: individual: TOI-615b / planets and satellites: individual: TOI-622b / stars: early-type / techniques: photometric / techniques: radial velocities / planets and satellites: individual: TOI-2641b

The photometric and radial velocity data in this work are only available at the CDS via anonymous ftp to ( or via

Astronomy & Astrophysics
Volume 675, Article Number A39, Number of pages 15
2023 July

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Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia