Abstract

Contributed Talk - Splinter ExoPlanets

Wednesday, 17 September 2025, 16:15

Decoding the TTV Signal of the Warm Saturn around HD 332231

Gracjan Maciejewski
Nicolaus Copernicus University in Torun

We report a coherent transit timing variation (TTV) signal in the warm Saturn HD 332231 b, a close-in gas giant orbiting a late F-type star. Updated transit ephemerides from TESS photometry reveal a periodic TTV signature with a period of about 6.7 years and an amplitude of roughly 45 minutes. Dynamical considerations suggest the signal is induced by an undetected outer companion on a moderately to highly eccentric orbit, possibly near a high-order mean-motion resonance. Ground-based transit monitoring in 2025 is critical to track the ongoing TTV cycle and refine its period. High-precision CHEOPS observations planned for 2026 will provide timing measurements that can partly reduce dynamical degeneracies and test the eccentric perturber hypothesis, making HD 332231 an exciting target for uncovering hidden companions and exploring long-term multi-planet dynamics.