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55 Cancri e’s occultation captured with CHEOPS★,,★★
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(2022) 55 Cancri e’s occultation captured with CHEOPS★,,★★. Astronomy & Astrophysics, 669 . A64. doi:10.1051/0004-6361/202244894 ISSN 0004-6361.
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Official URL: http://doi.org/10.1051/0004-6361/202244894
Abstract
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.
Item Type: | Journal Article | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Journal or Publication Title: | Astronomy & Astrophysics | ||||||
Publisher: | EDP Sciences | ||||||
ISSN: | 0004-6361 | ||||||
Official Date: | 13 October 2022 | ||||||
Dates: |
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Volume: | 669 | ||||||
Article Number: | A64 | ||||||
DOI: | 10.1051/0004-6361/202244894 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Copyright Holders: | © The Authors 2023 | ||||||
Date of first compliant deposit: | 3 March 2023 | ||||||
Date of first compliant Open Access: | 3 March 2023 |
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