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The study of multi-planet systems can reveal important aspects that challenge our knowledge of planet formation and evolution via determination of planetary system architectures and internal structures. The CHEOPS satellite, launched in Dec 2019, has spent the past year taking high-precision transit photometry of such systems with a key science goal of the mission to further our understanding of this sub-field of exoplanet research.

In this talk, I will present CHEOPS studies of two systems hosting five or more planets expected to become cornerstones of exoplanet characterisation; HD 108236 and TOI-178. The former is a V~9 mag, solar-like star discovered with TESS around which we detected an additional mini-Neptune making it one of a handful of systems with more than four transiting planets bright than V=10 mag. The latter is a six planet system with orbital periods <21d, in which our extensive CHEOPS observations detected four for the first time, and revealed that all, but the innermost, is in a Laplace resonance chain. By combining the precise CHEOPS photometry with RV observations, we found substantial density divergences between neighbouring planets that raises questions about their formation and evolution, and highlights the need for further study.

Characterising Multi-Planet Systems with CHEOPS