A Cold and Superpuffy Planet on a Prograde Orbit

Le résumé fourni par la source

Abstract 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 = − 15 − 44 + 50 ° (∣ λ ∣ < 80° at 3 σ ). 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.

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