The GAPS programme at TNG: XLIX. TOI-5398, the youngest compact multi-planet system composed of an inner sub-Neptune and an outer warm Saturn

0583668 - ASÚ 2025 RIV FR eng J - Článek v odborném periodiku
Mantovan, G. - Malavolta, L. - Desidera, S. - Kabáth, Petr … celkem 71 autorů
The GAPS programme at TNG: XLIX. TOI-5398, the youngest compact multi-planet system composed of an inner sub-Neptune and an outer warm Saturn.
Astronomy & Astrophysics. Roč. 682, February (2024), č. článku A129. ISSN 0004-6361. E-ISSN 1432-0746
Grant CEP: GA MŠMT(CZ) LTT20015
Institucionální podpora: RVO:67985815
Klíčová slova: planetary systems * planets and satellites * fundamental parameters
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 6.5, rok: 2022
Způsob publikování: Open access

We report the confirmation of TOI-5398, the youngest known compact multi-planet system composed of a hot sub-Neptune (TOI-5398 c, P-c = 4.77271 days) orbiting interior to a short-period Saturn (TOI-5398 b, P-b = 10.590547 days) planet, both transiting around a 650 +/- 150 Myr G-type star. As part of the Global Architecture of Planetary Systems (GAPS) Young Object project, we confirmed and characterised this compact system, measuring the radius and mass of both planets, thus constraining their bulk composition. Using multi-dimensional Gaussian processes, we simultaneously modelled stellar activity and planetary signals from the Transiting Exoplanet Survey Satellite (TESS) Sector 48 light curve and our High Accuracy Radial velocity Planet Searcher (HARPS-N) radial velocity (RV) time series. We confirmed the planetary nature of both planets, TOI-5398 b and TOI-5398 c, and obtained a precise estimation of their stellar parameters.
Trvalý link: https://hdl.handle.net/11104/0353353