2239607

Target RA (J2000): 3.955176 and deg Target Dec (J2000): 13.55619 and deg Gaia GMag: 11.4 Programme ID: CH_PR240012 PI of observing programme: Venner Title of programme: Characterising the nearest known temperate Earth-sized exoplanet with CHEOPS Abstract: In the study of exoplanets special interest is often given to those most similar to Earth. Recent observations of a bright and nearby (12 pc) M-dwarf by TESS have revealed the presence of an Earth-sized exoplanet with a relatively low incident flux (no more than twice Earth's insolation). However the unfortunate coincidence of the planetary orbital period with gaps in the TESS photometry means that there is a factor-of-two uncertainty in the orbital period. We propose CHEOPS observations to resolve this period ambiguity and to more precisely characterise the physical parameters of the planet. Transit observations from CHEOPS will contribute significantly to our understanding of this system and will form a key basis for current and future characterisation efforts of this remarkable planet. [truncated! Please see actual data for full text]