2447438

Target RA (J2000): 197.912506 and deg Target Dec (J2000): -47.45457 and deg Gaia GMag: 10.779 Programme ID: CH_PR230034 PI of observing programme: Edwards Title of programme: Rescuing Longer Period TESS Planet Candidates for Future Atmospheric Characterisation Abstract: Keeping track of the colossal number of new exoplanet detections is becoming ever more difficult. Yet if we wish to conduct a thorough characterisation of these worlds by studying its atmosphere for instance we must be sure of when the planet is going to transit. Due to the short observing sectors of TESS (< 30 days) our knowledge of the ephemerides of these worlds is quickly decaying. In fact by the time most planet confirmation papers are published the uncertainty on the transit time is often into the tens of minutes and when followed-up large shifts are often seen in the transit times. The situation is even worse for longer period planets which are also more rarely found by the TESS mission. Hence we propose to conduct timely observations of seven of the best longer period TESS planet candidates for atmospheric characterisation. These data will ensure that our knowledge of their ephemeris remains up-to-date and so will facilitate the possibility for atmospheric characterisation in the near-future. CHEOPS is the only facility capable of these observations and the dataset proposed will be of great value to the exoplanet community. [truncated! Please see actual data for full text]