ExoClock Project. II. A Large-scale Integrated Study with 180 Updated Exoplanet Ephemerides

Abstract The ExoClock project is an inclusive, integrated, and interactive platform that was developed to monitor the ephemerides of Ariel targets increase mission efficiency. makes best use all available resources, i.e., observations from ground telescopes, midtime values literature, finally, space instruments. Currently, network includes 280 participants with telescopes capable observing 85% currently known candidate targets. This work results ∼1600 obtained up 2020 December 31 network. These data in combination ∼2350 collected literature are used update 180 planets. analysis shows 40% updated will have impact on future scheduling as either they a significantly improved precision or revealed biases old ephemerides. With new observations, coverage rate for half planets sample has been doubled more. Finally, population perspective, we identify differences 2028 predictions between STD double what expected Gaussian uncertainties. findings implications planning where need account drifts potentially greater than prediction open accessible wider exoplanet community both our Open Science Framework repository website.