The next generation of spacecrafts dedicated to exoplanetary research will focus on detailed studies of planetary parameters with the goal to understand under what circumstances different types of planets and systems form and evolve. CHEOPS, a small satellite with a unique instrument, is dedicated to measure light curves with unprecedented precision in order to extract a maximum of information from individual transits of exoplanets. M-dwarf stars are the most common ofpotential exoplanet host stars in the Galaxy. It is therefore very important to understand planetary systems orbitingsuch stars and to determine the physical parameters of such planets with high precision. Also, with the launch of the James Webb Space Telescope (JWST) the observation ofatmospheric parameters of planets orbiting these stars is becomingimminent. It is therefore required to determine properties of potential targets.