Students from Grace Academy Coventry, along with University of Warwick Orbyts Fellows Yoshi N. E. Eschen and Isobel L., investigated the exoplanetary system TOI-2818 discovered by Yee et al. (2023). Recent work by McKee et al. (2025) hinted at a second planet due to variations in the transit timings of TOI-2818b. This project refined the orbital period and transit times of TOI-2818b through analysis of new data from the Transiting Exoplanet Survey Satellite (TESS) and the Characterising ExOPlanet Satellite (CHEOPS).

Exoplanets are planets orbiting stars beyond our Sun and are detected by observing tiny dips in a star's brightness as a planet passes in front of its host star. TOI-2818b is a gas giant exoplanet discovered using TESS data in 2023 and orbits it's host star, TOI-2818, every 4 days.

The analysis involved modelling transits in the TESS photometry to determine the orbital period (P) and transit times (t_0) of TOI-2818b using the python software juliet. For the CHEOPS photometry, 'pycheops' was employed to