Speaker
Description
Resonant exoplanetary systems, in which the period ratio between consecutive planets is close to a natural number, are relatively rare in the universe. However, the fine-tuning required for these orbital configurations make resonant systems valuable for studying the early stages of planet formation and evolution. Additionally, the strong transit timing variations (TTVs) arising from the mutual planet-planet interactions allow for precise characterisation of masses and orbital parameters. We will present the analysis of HD110067, a bright K0V star hosting a resonant chain of 6 planets ranging 2-3 Earth radii with orbital periods between 9 and 55 days. Combining photometry from TESS and CHEOPS with HARPS-N spectroscopy, we perform a joint photo-dynamical and radial velocity (RV) analysis to derive precise planetary masses, radii, and orbital parameters. We explore the effect of different mass and eccentricity priors and stellar activity models, demonstrating the power of TTV-RV modelling for the characterization of compact resonant planetary systems.