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Target RA (J2000): 125.188789367676 and deg Target Dec (J2000): 46.2037200927734 and deg Gaia GMag: 11.327 Programme ID: CH_PR140085 Programme Manager: VENTURINI PI of observing programme: Benz Title of programme: Axis 1 - Towards an S-type radius valley determination (S-valley) Abstract: The number of planets orbiting binary stars has notably increased in the past three years thanks to follow-up of Tess Objects of Interest by direct imaging and GAIA. The demographic properties of planets in binaries are only starting to be unveiled. An important question to address for planets around binaries is that of the radius valley a deficit of exoplanets with 1.5 to 2.0 Earth radii found for planets orbiting single stars. A recent study by Sullivan et al. 2023 reports that no radius valley exists for S-type planets (planets in binaries orbiting only one of the stellar components). The study was performed with a sample of Kepler planets which suffers from large errors in the planetary radii. In addition the planets were assumed to orbit the primary star which adds an additional (and large) source of error in case a planet orbits in reality the secondary star. With this program we re-address the radius valley question by combining past observational data with new measurements from CHEOPS. [truncated! Please see actual data for full text]