55 Cancri e's occultation captured with CHEOPS

Autor(en): B. O. Demory, S. Sulis, E. Meier Valdés, L. Delrez, A. Brandeker, N. Billot, A. Fortier, S. Hoyer, S. G. Sousa, K. Heng, M. Lendl, A. Krenn, B. M. Morris, J. A. Patel, Y. Alibert, R. Alonso, G. Anglada, T. Bárczy, D. Barrado, S. C.C. Barros, W. Baumjohann, M. Beck, T. Beck, W. Benz, X. Bonfils, C. Broeg, M. Buder, J. Cabrera, S. Charnoz, A. Collier Cameron, H. Cottard, Sz Csizmadia, M. B. Davies, M. Deleuil, O. D.S. Demangeon, D. Ehrenreich, A. Erikson, L. Fossati, M. Fridlund, D. Gandolfi, M. Gillon, M. Güdel, K. G. Isaak, L. L. Kiss, J. Laskar, A. Lecavelier Des Etangs, C. Lovis, A. Luntzer, D. Magrin, L. Marafatto, P. F.L. Maxted, V. Nascimbeni, G. Olofsson, R. Ottensamer, I. Pagano, E. Pallé, G. Peter, G. Piotto, D. Pollacco, D. Queloz, R. Ragazzoni, N. Rando, F. Ratti, H. Rauer, I. Ribas, N. C. Santos, G. Scandariato, D. Ségransan, A. E. Simon, A. M.S. Smith, M. Steller, Gy M. Szabó, N. Thomas, S. Udry, V. Van Grootel, N. A. Walton
Abstrakt: 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 ± 3 ppm. We derive a corresponding 2ÏÃ Â upper limit on the geometric albedo of Ag < 0.55 once decontaminated from the thermal emission measured by Spitzer at 4.5 μm. CHEOPSâÃ Â€Ã Â™ 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.
Organisation(en): Institut für Astrophysik
Externe Organisation(en): Universität Bern, Aix-Marseille Université, Université de Liège, Stockholm University, Universität Genf, Universidade do Porto, University of Warwick, Österreichische Akademie der Wissenschaften (ÖAW), Instituto de Astrofísica de Canarias (IAC), Universidad de La Laguna, Spanish National Research Council (CSIC), Institut d'Estudis Espacials de Catalunya (IEEC), Admatis, European Space Astronomy Centre (ESA), Université Grenoble-Alpes, Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Université de Paris, University of St. Andrews, Almatech SA, Lund University, Leiden University, Chalmers University of Technology, Università degli Studi di Torino, European Space Research & Technology Centre (ESA/ESTEC), MTA Társadalomtudományi Kutatóközpont, Eötvös Loránd University Budapest, Université de recherche Paris Sciences et Lettres, Université Paris VI - Pierre-et-Marie-Curie, INAF - Osservatorio Astronomico di Padova, Keele University, INAF-Osservatorio Astrofisico di Catania, Università degli Studi di Padova, Eidgenössische Technische Hochschule Zürich, University of Cambridge, Technische Universität Berlin, Freie Universität Berlin (FU)
Journal: Astronomy and Astrophysics
Band: 669
Anzahl der Seiten: 10
ISSN: 0004-6361
DOI: https://doi.org/10.1051/0004-6361/202244894
Publikationsdatum: 01-2023
Peer-reviewed: Ja
ÖFOS 2012: 103003 Astronomie, 103004 Astrophysik, 103038 Weltraumforschung
Schlagwörter
ASJC Scopus Sachgebiete: Astronomy and Astrophysics, Space and Planetary Science
Link zum Portal: https://ucrisportal.univie.ac.at/de/publications/8853d609-4e11-4f7d-b878-63bec1acb38a

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