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55 Cancri e's occultation captured with CHEOPS
Stockholm University, Faculty of Science, Department of Astronomy.ORCID iD: 0000-0002-7201-7536
Stockholm University, Faculty of Science, Department of Astronomy.
Stockholm University, Faculty of Science, Department of Astronomy.ORCID iD: 0000-0001-5644-6624
Stockholm University, Faculty of Science, Department of Astronomy.ORCID iD: 0000-0003-3747-7120
Number of Authors: 762023 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 669, article id A64Article in journal (Refereed) Published
Abstract [en]

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 2σ upper limit on the geometric albedo of Ag < 0.55 once decontaminated from the thermal emission measured by Spitzer at 4.5 µm. 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.

Place, publisher, year, edition, pages
2023. Vol. 669, article id A64
Keywords [en]
planets and satellites: individual: 55 Cnc e, techniques: photometric, methods: observational
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-215723DOI: 10.1051/0004-6361/202244894ISI: 000927949800004Scopus ID: 2-s2.0-85146369927OAI: oai:DiVA.org:su-215723DiVA, id: diva2:1745957
Available from: 2023-03-27 Created: 2023-03-27 Last updated: 2023-03-27Bibliographically approved

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Brandeker, AlexisPatel, Jayshil AshokkumarOlofsson, Göran

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