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A cold and superpuffy planet on a prograde orbit

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...

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Main Authors: Espinoza Retamal, Juan Ignacio (Author) , Brahm, Rafael (Author) , Petrovich, Cristobal (Author) , Jordán, Andrés (Author) , Henning, Thomas (Author) , Trifonov, Trifon (Author) , Winn, Joshua N. (Author) , Rea, Erika (Author) , Günther, Maximilian N. (Author) , Agabi, Abdelkrim (Author) , Bendjoya, Philippe (Author) , Bhaskar, Hareesh (Author) , Bouchy, François (Author) , Catelan, Márcio (Author) , Charalambous, Carolina (Author) , Deloupy, Vincent (Author) , Dransfield, George (Author) , Eberhardt, Jan (Author) , Espinoza, Néstor (Author) , Freckelton, Alix V. (Author) , Guillot, Tristan (Author) , Hobson, Melissa J. (Author) , Jones, Matías I. (Author) , Lendl, Monika (Author) , Mekarnia, Djamel (Author) , Muñoz, Diego J. (Author) , D. Nielsen, Louise (Author) , Rojas, Felipe I. (Author) , Schmider, François-Xavier (Author) , Sedaghati, Elyar (Author) , Stefánsson, Guđmundur (Author) , Striegel, Stephanie (Author) , Suarez, Olga (Author) , Tala Pinto, Marcelo (Author) , Timmermans, Mathilde (Author) , Triaud, Amaury H. M. J. (Author) , Udry, Stéphane (Author) , Ulmer-Moll, Solène (Author) , Ziegler, Carl (Author)
Format: Article (Journal)
Language:English
Published: 2026 January 1
In: The astrophysical journal. Part 2, Letters
Year: 2026, Volume: 996, Issue: 1, Pages: 1-14
ISSN:2041-8213
DOI:10.3847/2041-8213/ae2bfa
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.3847/2041-8213/ae2bfa
Verlag, kostenfrei, Volltext: https://iopscience.iop.org/article/10.3847/2041-8213/ae2bfa
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Author Notes:Juan I. Espinoza-Retamal, Rafael Brahm, Cristobal Petrovich, Andrés Jordán, Thomas Henning, Trifon Trifonov, Joshua N. Winn, Erika Rea, Maximilian N. Günther, Abdelkrim Agabi, Philippe Bendjoya, Hareesh Bhaskar, François Bouchy, Márcio Catelan, Carolina Charalambous, Vincent Deloupy, George Dransfield, Jan Eberhardt, Néstor Espinoza, Alix V. Freckelton, Tristan Guillot, Melissa J. Hobson, Matías I. Jones, Monika Lendl, Djamel Mekarnia, Diego J. Muñoz, Louise D. Nielsen, Felipe I. Rojas, François-Xavier Schmider, Elyar Sedaghati, Guđmundur Stefánsson, Stephanie Striegel, Olga Suarez, Marcelo Tala Pinto, Mathilde Timmermans, Amaury H.M.J. Triaud, Stéphane Udry, Solène Ulmer-Moll, and Carl Ziegler
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Summary: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 ° (∣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.
Item Description:Gesehen am 07.04.2026
Physical Description:Online Resource
ISSN:2041-8213
DOI:10.3847/2041-8213/ae2bfa

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