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55 Cancri e's occultation captured with CHEOPS

Matthews, P; Demory, B-O; Sulis, S; Valdes, EM; Brandeker, A; Billot, N; Fortier, A; Hoyer, S; Sousa, SG; Heng, K; Lendl, M; Krenn, A; Morris, BM; Patel, JA; Alibert, Y; Alonso, R; Delrez, L; Anglada, G; Broeg, C; Buder, M; Cabrera, J; Charnoz, S; Cameron, AC; Cottard, H; Csizmadia, S; Davies, MB; Deleuil, M; Demangeon, ODS; Ehrenreich, D; Erikson, A; Fossati, L; Fridlund, M; Gandolfi, D; Gillon, M; Guedel, M; Barczy, T; Barrado, D; Barros, SCC; Baumjohann, W; Beck, M; Beck, T; Benz, W; Bonfils, X; Isaak, KG; Kiss, LL; Laskar, J; des Etangs, AL; Lovis, C; Luntzer, A; Magrin, D; Marafatto, L; Maxted, PFL; Nascimbeni, V; Olofsson, G; Ottensamer, R; Pagano, I; Palle, E; Peter, G; Piotto, G; Pollacco, D; Queloz, D; Ragazzoni, R; Rando, N; Ratti, F; Rauer, H; Ribas, I; Santos, NC; Scandariato, G; Segransan, D; Simon, AE; Smith, AMS; Steller, M; Szabo, GM; Thomas, N; Udry, S; Van Grootel, V; Walton, NA

55 Cancri e's occultation captured with CHEOPS Thumbnail


B-O Demory

S Sulis

EM Valdes

A Brandeker

N Billot

A Fortier

S Hoyer

SG Sousa

K Heng

M Lendl

A Krenn

BM Morris

JA Patel

Y Alibert

R Alonso

L Delrez

G Anglada

C Broeg

M Buder

J Cabrera

S Charnoz

AC Cameron

H Cottard

S Csizmadia

MB Davies

M Deleuil

ODS Demangeon

D Ehrenreich

A Erikson

L Fossati

M Fridlund

D Gandolfi

M Gillon

M Guedel

T Barczy

D Barrado

SCC Barros

W Baumjohann

M Beck

T Beck

W Benz

X Bonfils

KG Isaak

LL Kiss

J Laskar

AL des Etangs

C Lovis

A Luntzer

D Magrin

L Marafatto

V Nascimbeni

G Olofsson

R Ottensamer

I Pagano

E Palle

G Peter

G Piotto

D Pollacco

D Queloz

R Ragazzoni

N Rando

F Ratti

H Rauer

I Ribas

NC Santos

G Scandariato

D Segransan

AE Simon

AMS Smith

M Steller

GM Szabo

N Thomas

S Udry

V Van Grootel

NA Walton


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 2s 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.


Matthews, P., Demory, B., Sulis, S., Valdes, E., Brandeker, A., Billot, N., …Walton, N. (2023). 55 Cancri e's occultation captured with CHEOPS. Astronomy & Astrophysics,

Acceptance Date Oct 13, 2022
Publication Date Jan 11, 2023
Journal Astronomy & Astrophysics
Print ISSN 0004-6361
Publisher EDP Sciences
Keywords planets and satellites: individual: 55 Cnc e; techniques: photometric; methods: observational
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