Accès ouvert déclaré
2022
preprint
55 Cancri e's occultation captured with CHEOPS
B. -O. Demory, S. Sulis, Erik A. Meier Valdés, L. Delrez, A. Brandeker, N. Billot, A. Fortier, S. Hoyer, S. G. Sousa, K. Heng, M. Lendl, A. Krenn, Brett M. Morris, J. A. Patel, Y. Alibert, R. Alonso, G. Anglada, T. Barczy, D. Barrado, S. C. C. Barros, W. Baumjohann, M. Beck, T. Beck, W. Benz, X. Bonfils, C. Broeg, M. Buder, J. Cabrera, S. Charnoz, Andrew Collier Cameron, H. Cottard, Sz. Csizmadia, M. B. Davies, M. Deleuil, Olivier D S Demangeon, D. Ehrenreich, A. Erikson, L. Fossati, Malcolm C. Fridlund, D. Gandolfi, M. Gillon, M. Gudel, K. G. Isaak, L. L. Kiss, J. Laskar, Alain Lecavelier des Etangs, C. Lovis, A. Luntzer, Demetrio Magrin, L. Marafatto, Pierre F L Maxted, V. Nascimbeni, Göran Olofsson, R. Ottensamer, I. Pagano, E. Palle, G. Peter, G. Piotto, D. Pollacco, Didier P. Queloz, Roberto Ragazzoni, N. Rando, F. Ratti, H. Rauer, I. Ribas, Nuno C. Santos, G. Scandariato, D. Ségransan, A. E. Simon, Alexis M. S. Smith, M. Steller, Gy. M. Szabó, N. Thomas, S. Udry, V. Van Grootel, N. A. Walton
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Le résumé fourni par la source
Past occultation and phase-curve observations of the ultra-short period super-Earth 55 Cnc e obtained at visible and infrared wavelengths have been challenging to reconcile with a planetary reflection and emission model. In this study, we analyse a set of 41 occultations obtained over a two-year timespan with the CHEOPS satellite. We report the detection of 55 Cnc e's occultation with an average depth of $12\pm3$ ppm. We derive a corresponding 2-$σ$ upper limit on the geometric albedo of $A_g < 0.55$ once decontaminated from the thermal emission measured by Spitzer at 4.5$μ$m. CHEOPS's photometric performance enables, for the first time, the detection of individual occultations of this super-Earth in the visible and identifies short-timescale photometric corrugations likely induced by stellar granulation. We also find a clear 47.3-day sinusoidal pattern in the time-dependent occultation depths that we are unable to relate to stellar noise, nor instrumental systematics, but whose planetary origin could be tested with upcoming JWST occultation observations of this iconic super-Earth.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
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Les sujets associés
Astrophysics and Cosmic PhenomenaSolar and Space Plasma Dynamics