CHEOPS precision phase curve of the Super-Earth 55 Cancri e
Artikel i vetenskaplig tidskrift, 2021
Context. 55 Cnc e is a transiting super-Earth (radius 1.88 R-circle plus and mass 8 M-circle plus) orbiting a G8V host star on a 17-h orbit. Spitzer observations of the planet's phase curve at 4.5 mu m revealed a time-varying occultation depth, and MOST optical observations are consistent with a time-varying phase curve amplitude and phase offset of maximum light. Both broadband and high-resolution spectroscopic analyses are consistent with either a high mean molecular weight atmosphere or no atmosphere for planet e. A long-term photometric monitoring campaign on an independent optical telescope is needed to probe the variability in this system. Aims. We seek to measure the phase variations of 55 Cnc e with a broadband optical filter with the 30 cm effective aperture space telescope CHEOPS and explore how the precision photometry narrows down the range of possible scenarios. Methods. We observed 55 Cnc for 1.6 orbital phases in March of 2020. We designed a phase curve detrending toolkit for CHEOPS photometry which allowed us to study the underlying flux variations in the 55 Cnc system. Results. We detected a phase variation with a full-amplitude of 72 +/- 7 ppm, but did not detect a significant secondary eclipse of the planet. The shape of the phase variation resembles that of a piecewise-Lambertian; however, the non-detection of the planetary secondary eclipse, and the large amplitude of the variations exclude reflection from the planetary surface as a possible origin of the observed phase variations. They are also likely incompatible with magnetospheric interactions between the star and planet, but may imply that circumplanetary or circumstellar material modulate the flux of the system. Conclusions. This year, further precision photometry of 55 Cnc from CHEOPS will measure variations in the phase curve amplitude and shape over time.
methods: observational
instrumentation: photometers
planets and satellites: atmospheres
techniques: photometric
planets and satellites: individual: 55 Cnc e
stars: individual: 55 Cnc
Författare
B. M. Morris
Universität Bern
L. Delrez
Université de Genève
Universite de Liège
A. Brandeker
Stockholms universitet
A. C. Cameron
University of St Andrews
A. E. Simon
Universität Bern
D. Futyan
Université de Genève
G. Olofsson
Stockholms universitet
S. Hoyer
Aix-Marseille Université
A. Fortier
Universität Bern
B-O Demory
Universität Bern
M. Lendl
Université de Genève
T. G. Wilson
University of St Andrews
M. Oshagh
Universidad de la Laguna
Instituto de Astrofísica de Canarias
K. Heng
Universität Bern
D. Ehrenreich
Université de Genève
S. Sulis
Aix-Marseille Université
Y. Alibert
Universität Bern
R. Alonso
Instituto de Astrofísica de Canarias
Universidad de la Laguna
G. Anglada Escude
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
Consejo Superior de Investigaciones Científicas (CSIC)
D. Barrado
Consejo Superior de Investigaciones Científicas (CSIC)
S. C. C. Barros
Universidade do Porto
W. Baumjohann
Österreichische Akademie der Wissenschaften
M. Beck
Université de Genève
T. Beck
Universität Bern
A. Bekkelien
Université de Genève
W. Benz
Universität Bern
M. Bergomi
Istituto nazionale di astrofisica (INAF)
N. Billot
Université de Genève
X. Bonfils
Université Grenoble Alpes
V Bourrier
Université de Genève
C. Broeg
Universität Bern
T. Barczy
Admatis
J. Cabrera
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
S. Charnoz
Université Paris Descartes
M. B. Davies
Lunds universitet
D. De Miguel Ferreras
Airbus Group
M. Deleuil
Aix-Marseille Université
A. Deline
Université de Genève
O. D. S. Demangeon
Universidade do Porto
A. Erikson
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
H. G. Floren
Stockholms universitet
L. Fossati
Österreichische Akademie der Wissenschaften
Malcolm Fridlund
Universiteit Leiden
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
D. Gandolfi
Universita degli Studi di Torino
A. Garcia Munoz
Technische Universität Berlin
M. Gillon
Universite de Liège
M. Guedel
Universität Wien
P. Guterman
Aix-Marseille Université
Institut National des Sciences de l'Univers
K. Isaak
Europeiska rymdorganisationen (ESA)
L. Kiss
The University of Sydney
Eötvös Loránd University (ELTE)
Magyar Tudomanyos Akademia
J. Laskar
Université de recherche Paris Sciences et Lettres
A. Lecavelier des Etangs
Université Pierre et Marie Curie (UPMC)
M. Lieder
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
C. Lovis
Université de Genève
D. Magrin
Istituto nazionale di astrofisica (INAF)
P. F. L. Maxted
Keele University
V Nascimbeni
Istituto nazionale di astrofisica (INAF)
R. Ottensamer
Universität Wien
I Pagano
Istituto nazionale di astrofisica (INAF)
E. Palle
Instituto de Astrofísica de Canarias
Universidad de la Laguna
G. Peter
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
G. Piotto
Istituto nazionale di astrofisica (INAF)
Università di Padova
A. Pizarro Rubio
Airbus Group
D. Pollacco
The University of Warwick
F. J. Pozuelos
Universite de Liège
D. Queloz
Université de Genève
University of Cambridge
R. Ragazzoni
Università di Padova
Istituto nazionale di astrofisica (INAF)
N. Rando
Europeiska rymdorganisationen (ESA)
H. Rauer
Technische Universität Berlin
Freie Universität Berlin
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
I Ribas
Consejo Superior de Investigaciones Científicas (CSIC)
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
N. C. Santos
Universidade do Porto
G. Scandariato
Istituto nazionale di astrofisica (INAF)
A. M. S. Smith
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
S. G. Sousa
Universidade do Porto
M. Steller
Österreichische Akademie der Wissenschaften
Gy M. Szabo
Eötvös Loránd University (ELTE)
D. Segransan
Université de Genève
N. Thomas
Universität Bern
S. Udry
Université de Genève
B. Ulmer
Ingenieurbüro Ulmer
V. Van Grootel
Universite de Liège
N. A. Walton
University of Cambridge
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 653 A173Ämneskategorier (SSIF 2011)
Astronomi, astrofysik och kosmologi
Atom- och molekylfysik och optik
Annan fysik
DOI
10.1051/0004-6361/202140892