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 the Ariel targets to increase the mission efficiency. The project makes the best use of all available resources, i.e., observations from ground telescopes, mid-time values from the literature and finally, observations from space instruments. Currently, the ExoClock network includes 280 participants with telescopes capable of observing 85\% of the currently known Ariel candidate targets. This work includes the results of 1600 observations obtained up to the 31st of December 2020 from the ExoClock network. These data in combination with 2350 mid-time values collected from the literature are used to update the ephemerides of 180 planets. The analysis shows that 40\% of the updated ephemerides will have an impact on future scheduling as either they have a significantly improved precision, or they have revealed biases in the old ephemerides. With the new observations, the observing coverage and rate for half of the planets in the sample has been doubled or more. Finally, from a population perspective, we identify that the differences in the 2028 predictions between the old and the new ephemerides have an STD that is double what is expected from gaussian uncertainties. These findings have implications for planning future observations, where we will need to account for drifts potentially greater than the prediction uncertainties. The updated ephemerides are open and accessible to the wider exoplanet community both from our Open Science Framework (OSF) repository and our website.
Keywords
Cite
@article{arxiv.2110.13863,
title = {ExoClock project II: A large-scale integrated study with 180 updated exoplanet ephemerides},
author = {A. Kokori and A. Tsiaras and B. Edwards and M. Rocchetto and G. Tinetti and L. Bewersdorff and Y. Jongen and G. Lekkas and G. Pantelidou and E. Poultourtzidis and A. Wünsche and C. Aggelis and V. K. Agnihotri and C. Arena and M. Bachschmidt and D. Bennett and P. Benni and K. Bernacki and E. Besson and L. Betti and A. Biagini and P. Brandebourg and M. Bretton and S. M. Brincat and M. Caló and F. Campos and R. Casali and R. Ciantini and M. V. Crow and B. Dauchet and S. Dawes and M. Deldem and D. Deligeorgopoulos and R. Dymock and T. Eenmäe and P. Evans and N. Esseiva and C. Falco and S. Ferratfiat and M. Fowler and S. R. Futcher and J. Gaitan and F. Grau Horta and P. Guerra and F. Hurter and A. Jones and W. Kang and H. Kiiskinen and T. Kim and D. Laloum and R. Lee and F. Lomoz and C. Lopresti and M. Mallonn and M. Mannucci and A. Marino and J. -C. Mario and J. -B. Marquette and J. Michelet and M. Miller and T. Mollier and D. Molina and N. Montigiani and F. Mortari and M. Morvan and L. V. Mugnai and L. Naponiello and A. Nastasi and R. Neito and E. Pace and P. Papadeas and N. Paschalis and C. Pereira and V. Perroud and M. Phillips and P. Pintr and J. -B. Pioppa and A. Popowicz and M. Raetz and F. Regembal and K. Rickard and M. Roberts and L. Rousselot and X. Rubia and J. Savage and D. Sedita and D. Shave-Wall and N. Sioulas and V. Školník and M. Smith and D. St-Gelais and D. Stouraitis and I. Strikis and G. Thurston and A. Tomacelli and A. Tomatis and B. Trevan and P. Valeau and J. -P. Vignes and K. Vora and M. Vrašťák and F. Walter and B. Wenzel and D. E. Wright and M. Zíbar},
journal= {arXiv preprint arXiv:2110.13863},
year = {2022}
}
Comments
9 pages (47 with appendices and references), 8 figures, 2 tables. Submitted to ApJS. Revised based on the reviewer's comments