Browsing by Author "Rea, Erika"

Now showing 1 - 1 of 1
  • Thumbnail Image
    Item
    A Cold and Superpuffy Planet on a Prograde Orbit
    (2026) Espinoza Retamal, Juan Ignacio; Brahm, Rafael; Petrovich, Cristobal; Jordán, Andrés; Henning, Thomas; Trifonov, Trifon; Winn, Joshua N.; Rea, Erika; Günther, Maximilian N.; Agabi, Abdelkrim; Bendjoya, Philippe; Bhaskar, Hareesh; Bouchy, François; Catelan, Márcio; Charalambous, Carolina; Deloupy, Vincent; Dransfield, George; Eberhardt, Jan; Espinoza, Néstor; Freckelton, Alix V.; Guillot, Tristan; Hobson, Melissa J.; Jones, Matías I.; Lendl, Monika; Mekarnia, Djamel; Muñoz, Diego J.; Nielsen, Louise D.; Rojas Henríquez, Felipe Ignacio; Schmider, François-Xavier; Sedaghati, Elyar; Stefánsson, Guđmundur; Striegel, Stephanie; Suarez, Olga; Tala Pinto, Marcelo; Timmermans, Mathilde; Triaud, Amaury H. M. J.; Udry, Stéphane; Ulmer-Moll, Solène; Ziegler, Carl
    We report the discovery of TOI-4507 b, a transiting sub-Saturn with a density <0.2 g cm−3 on a 105 days prograde orbit around a 700 Myr old F star. The transits were detected using data from TESS as well as the Antarctic telescope ASTEP. A joint analysis of the light curves and radial velocities from HARPS, FEROS, and CORALIE confirmed the planetary nature of the signal, by limiting the mass to be below 20 M⊕ at 95% confidence. The radial velocities also exhibit the Rossiter–McLaughlin effect and imply that the planet orbits the star in a prograde orbit with a sky-projected obliquity 15 44 50 = + ° (|λ| < 80° at 3σ). With these characteristics, TOI-4507 is one of the longest-period systems for which the stellar obliquity has been measured, and the planet is among the longest-period and youngest “superpuff” planets yet discovered.