A Cold and Super-Puffy Planet on a Prograde Orbit
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2025
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| author | Espinoza-Retamal, Juan I. 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, Felipe I. Schmider, François-Xavier Sedaghati, Elyar Stefánsson, Guðmundur Striegel, Stephanie Suarez, Olga Pinto, Marcelo Tala Timmermans, Mathilde Triaud, Amaury H. M. J. Udry, Stéphane Ulmer-Moll, Solène Ziegler, Carl |
| author_facet | Espinoza-Retamal, Juan I. 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, Felipe I. Schmider, François-Xavier Sedaghati, Elyar Stefánsson, Guðmundur Striegel, Stephanie Suarez, Olga Pinto, Marcelo Tala Timmermans, Mathilde Triaud, Amaury H. M. J. Udry, Stéphane Ulmer-Moll, Solène Ziegler, Carl |
| contents | We report the discovery of TOI-4507 b, a transiting sub-Saturn with a density $<$ 0.2 g/cm$^3$ on a 105-day 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 $M_\oplus$ 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 $λ=-15_{-44}^{+50}$ deg ($|λ|<80$ deg 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 ''super-puff'' planets yet discovered. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_00102 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A Cold and Super-Puffy Planet on a Prograde Orbit Espinoza-Retamal, Juan I. 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, Felipe I. Schmider, François-Xavier Sedaghati, Elyar Stefánsson, Guðmundur Striegel, Stephanie Suarez, Olga Pinto, Marcelo Tala Timmermans, Mathilde Triaud, Amaury H. M. J. Udry, Stéphane Ulmer-Moll, Solène Ziegler, Carl Earth and Planetary Astrophysics We report the discovery of TOI-4507 b, a transiting sub-Saturn with a density $<$ 0.2 g/cm$^3$ on a 105-day 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 $M_\oplus$ 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 $λ=-15_{-44}^{+50}$ deg ($|λ|<80$ deg 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 ''super-puff'' planets yet discovered. |
| title | A Cold and Super-Puffy Planet on a Prograde Orbit |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2510.00102 |