Transit Timing Variations in exoplanetary systems through the ExoClock Project

The ExoClock project is a platform that monitors the ephemerides of transiting exoplanets, with the purpose to provide a verified list of them for the upcoming ESA's M4 mission, Ariel, scheduled for launched in 2029. The project also offers a useful service for the wider working community, since it can give valuable information about the best timings for future observations. To this end, a large dataset of individual transits has been examined, including observations with space telescopes (Kepler, K2, TESS), ground-based observations and mid-time values from literature. This poster will emphasize on the latter aspect and will discuss the opportunities provided by ExoClock to utilize the project’s database for further research. More specifically, we search for non-linear patterns in planetary ephemerides and combine them with other physical properties (like possible resonances) for a number of exoplanetary systems. A fundamental Transit Timing Variations (TTVs) analysis of those has been performed and the results will be presented. These results include the estimation of the non-linear terms along with the underlying uncertainties.