Three Saturn-mass planets transiting F-type stars revealed with TESS and HARPS: TOI-615b, TOI-622b, and TOI-2641b

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

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


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.

Original languageEnglish (US)
Article numberA39
JournalAstronomy and Astrophysics
StatePublished - Jul 1 2023

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Planets and satellites: individual: TOI-2641b
  • Planets and satellites: individual: TOI-615b
  • Planets and satellites: individual: TOI-622b
  • Stars: early-type
  • Techniques: photometric
  • Techniques: radial velocities


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