ExoClock Project: An open platform for monitoring the ephemerides of Ariel targets with contributions from the public
Anastasia Kokori, Angelos Tsiaras, Billy Edwards, Marco Rocchetto,, Giovanna Tinetti, Ana\"el W\"unsche, Nikolaos Paschalis, Vikrant Kumar, Agnihotri, Matthieu Bachschmidt, Marc Bretton, Hamish Caines, Mauro Cal\'o,, Roland Casali, Martin Crow, Simon Dawes, Marc Deldem

TL;DR
The ExoClock project is an open, collaborative platform that gathers diverse observations to refine the ephemerides of exoplanets targeted by the Ariel mission, enhancing mission efficiency and public engagement.
Contribution
It introduces a novel, open platform integrating professional and amateur observations for systematic ephemeris verification and updates for Ariel targets.
Findings
Verified or updated ephemerides for 83 planets.
Collected 632 observations from over 140 participants.
Developed the Exoplanet Characterisation Catalogue (ECC).
Abstract
The Ariel mission will observe spectroscopically around 1000 exoplanets to further characterise their atmospheres. For the mission to be as efficient as possible, a good knowledge of the planets' ephemerides is needed before its launch in 2028. While ephemerides for some planets are being refined on a per-case basis, an organised effort to collectively verify or update them when necessary does not exist. In this study, we introduce the ExoClock project, an open, integrated and interactive platform with the purpose of producing a confirmed list of ephemerides for the planets that will be observed by Ariel. The project has been developed in a manner to make the best use of all available resources: observations reported in the literature, observations from space instruments and, mainly, observations from ground-based telescopes, including both professional and amateur observatories. To…
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