CHEOPS observations of the HD 108236 planetary system: a fifth planet, improved ephemerides, and planetary radii

  title={CHEOPS observations of the HD 108236 planetary system: a fifth planet, improved ephemerides, and planetary radii},
  author={Andrea Bonfanti and Laetitia Delrez and Matthew J. Hooton and Thomas G. Wilson and Luca Fossati and Yann Alibert and Sergio Hoyer and Alexander J. Mustill and Hugh Osborn and Vardan Adibekyan and Davide Gandolfi and S'ebastien Salmon and S{\'e}rgio G. Sousa and A. T. Tuson and Val{\'e}rie Van Grootel and J. Cabrera and Valerio Nascimbeni and P. F. L. Maxted and Susana C. C. Barros and Nicolas Billot and Xavier Bonfils and L Borsato and Christopher Broeg and Melvyn B. Davies and Magali Deleuil and Olivier D. S. Demangeon and Malcolm Fridlund and Gaia Lacedelli and Monika Lendl and Carina M. Persson and Nuno C. Santos and Gaetano Scandariato and Gyula M. Szab'o and Andrew Collier Cameron and St{\'e}phane Udry and W. Benz and M. Beck and David Ehrenreich and Andrea Fortier and Kate Gudrun Isaak and Didier Queloz and Ricardo J. Alonso and Joel Asquier and Timothy Bandy and T. B'arczy and David Barrado and Oscar Barrag'an and Wolfgang Baumjohann and Thomas Beck and Anja Bekkelien and Maria Bergomi and M-D. Busch and Alexis Brandeker and Virginie Cessa and S{\'e}bastien Charnoz and B. Chazelas and Carlos Corral van Damme and B-O. Demory and Anders Erikson and Jacopo Farinato and David Futyan and Antonio Garc{\'i}a Mu{\~n}oz and Micha{\"e}l Gillon and Manuel Guedel and Pascal Guterman and J. Hasiba and Kevin Heng and E. Hernandez and L{\'a}szl{\'o} L. Kiss and Thibault Kuntzer and Jacques Laskar and Alain Lecavelier des Etangs and Christophe Lovis and Demetrio Magrin and L. Malvasio and Luca Marafatto and Harald Michaelis and Matteo Munari and Goeran Olofsson and Harald Ottacher and Roland Ottensamer and Isabella Pagano and Enric Pall'e and Gisbert Peter and Daniele Piazza and Giampaolo Piotto and Don Pollacco and R. Ragazzoni and Nicola Rando and Francesco Ratti and Heike Rauer and Ignasi Ribas and Martin Rieder and R. Rohlfs and Fr{\'e}d{\'e}ric Safa and Mario Salatti and Damien S'egransan and Attila E. Simon and A.M.S. Smith and Michael Sordet and Manfred Steller and Nicolas Thomas and Matthias Tschentscher and Vincent Van Eylen and Valentina Viotto and Ingo Walter and Nicholas A. Walton and F. Wildi and Dieter Wolter},
Context. The detection of a super-Earth and three mini-Neptunes transiting the bright (V = 9.2 mag) star HD 108236 (also known as TOI-1233) was recently reported on the basis of TESS and ground-based light curves. Aims. We perform a first characterisation of the HD 108236 planetary system through high-precision CHEOPS photometry and improve the transit ephemerides and system parameters. Methods. We characterise the host star through spectroscopic analysis and derive the radius with the infrared… 
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