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55 Cancri e's occultation captured with CHEOPS

Demory, B.-O. ; Davies, M.B. LU and Walton, N.A. (2023) In Astronomy and Astrophysics 669.
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 2Ïà  upper limit on the geometric albedo of Ag < 0.55 once decontaminated from the thermal emission measured by Spitzer at 4.5 μm. CHEOPSâà €à ™ s photometric performance enables, for the first time, the detection of individual occultations of this super-Earth in the visible and identifies... (More)
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 2Ïà  upper limit on the geometric albedo of Ag < 0.55 once decontaminated from the thermal emission measured by Spitzer at 4.5 μm. CHEOPSâà €à ™ 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. © 2023 EDP Sciences. All rights reserved. (Less)
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keywords
Methods: observational, Planets and satellites: individual: 55 Cnc e, Techniques: photometric, Satellites, Stars, Infrared wavelengths, Methods:observational, Photometrics, Planet and satellite: individual: 55 cnc e, Planets and satellites: individual, Reflection Models, Short periods, Stellars, Visible wavelengths, Photometry
in
Astronomy and Astrophysics
volume
669
article number
A64
publisher
EDP Sciences
external identifiers
  • scopus:85146369927
ISSN
0004-6361
DOI
10.1051/0004-6361/202244894
language
English
LU publication?
yes
id
95eb20b2-a246-44c6-b583-02482e3977db
date added to LUP
2023-02-16 08:21:51
date last changed
2023-02-16 08:23:22
@article{95eb20b2-a246-44c6-b583-02482e3977db,
  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 2Ïà  upper limit on the geometric albedo of Ag &lt; 0.55 once decontaminated from the thermal emission measured by Spitzer at 4.5 μm. CHEOPSâà €à ™ 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. © 2023 EDP Sciences. All rights reserved.}},
  author       = {{Demory, B.-O. and Davies, M.B. and Walton, N.A.}},
  issn         = {{0004-6361}},
  keywords     = {{Methods: observational; Planets and satellites: individual: 55 Cnc e; Techniques: photometric; Satellites; Stars; Infrared wavelengths; Methods:observational; Photometrics; Planet and satellite: individual: 55 cnc e; Planets and satellites: individual; Reflection Models; Short periods; Stellars; Visible wavelengths; Photometry}},
  language     = {{eng}},
  publisher    = {{EDP Sciences}},
  series       = {{Astronomy and Astrophysics}},
  title        = {{55 Cancri e's occultation captured with CHEOPS}},
  url          = {{http://dx.doi.org/10.1051/0004-6361/202244894}},
  doi          = {{10.1051/0004-6361/202244894}},
  volume       = {{669}},
  year         = {{2023}},
}