Analysis of Early Science observations with the CHaracterising ExOPlanets Satellite (CHEOPS) using pycheops
Journal article, 2022
CHEOPS (CHaracterising ExOPlanet Satellite) is an ESA S-class mission that observes bright stars at high cadence from low-Earth orbit. The main aim of the mission is to characterize exoplanets that transit nearby stars using ultrahigh precision photometry. Here, we report the analysis of transits observed by CHEOPS during its Early Science observing programme for four well-known exoplanets: GJ 436 b, HD 106315 b, HD 97658 b, and GJ 1132 b. The analysis is done using pycheops, an open-source software package we have developed to easily and efficiently analyse CHEOPS light-curve data using state-of-the-art techniques that are fully described herein. We show that the precision of the transit parameters measured using CHEOPS is comparable to that from larger space telescopes such as Spitzer Space Telescope and Kepler. We use the updated planet parameters from our analysis to derive new constraints on the internal structure of these four exoplanets.
methods: data analysis
planets and satellites: fundamental parameters
software: data analysis
Author
P. F. L. Maxted
Keele University
D. Ehrenreich
University of Geneva
T. G. Wilson
University of St Andrews
Y. Alibert
University of Bern
A. Collier Cameron
University of St Andrews
S. Hoyer
Aix Marseille University
S. G. Sousa
University of Porto
G. Olofsson
Stockholm University
A. Bekkelien
University of Geneva
A. Deline
University of Geneva
L. Delrez
University of Liège
A. Bonfanti
Austrian Academy of Sciences
L. Borsato
Istituto nazionale di astrofisica (INAF)
R. Alonso
Instituto de Astrofísica de Canarias
University of La Laguna
G. Anglada Escude
Institute of Space Studies of Catalonia (IEEC)
Spanish National Research Council (CSIC)
D. Barrado
Spanish National Research Council (CSIC)
S. C. C. Barros
University of Porto
W. Baumjohann
Austrian Academy of Sciences
M. Beck
University of Geneva
T. Beck
University of Bern
W. Benz
University of Bern
N. Billot
University of Geneva
F. Biondi
Istituto nazionale di astrofisica (INAF)
Max Planck Institute for Extraterrestrial Physics
X. Bonfils
Grenoble Alpes University
A. Brandeker
Stockholm University
C. Broeg
University of Bern
T. Barczy
Admatis
J. Cabrera
German Aerospace Center (DLR)
S. Charnoz
Centre national de la recherche scientifique (CNRS)
C. Corral Van Damme
European Space Agency (ESA)
Sz Csizmadia
German Aerospace Center (DLR)
M. Deleuil
Aix Marseille University
O. D. S. Demangeon
University of Porto
B-O Demory
University of Bern
A. Erikson
German Aerospace Center (DLR)
H. G. Floren
Stockholm University
A. Fortier
University of Bern
L. Fossati
Austrian Academy of Sciences
Malcolm Fridlund
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
D. Futyan
University of Geneva
D. Gandolfi
University of Turin
M. Gillon
University of Liège
M. Guedel
University of Vienna
P. Guterman
Institut National des Sciences de l'Univers
Aix Marseille University
K. Heng
The University of Warwick
University of Bern
K. G. Isaak
European Space Research and Technology Centre (ESA ESTEC)
L. Kiss
Konkoly Observatory
J. Laskar
Sorbonne University
A. Lecavelier des Etangs
Sorbonne University
M. Lendl
University of Geneva
C. Lovis
University of Geneva
D. Magrin
Istituto nazionale di astrofisica (INAF)
V Nascimbeni
Istituto nazionale di astrofisica (INAF)
R. Ottensamer
University of Vienna
I Pagano
Istituto nazionale di astrofisica (INAF)
E. Palle
Instituto de Astrofísica de Canarias
University of La Laguna
G. Peter
German Aerospace Center (DLR)
G. Piotto
Istituto nazionale di astrofisica (INAF)
University of Padua
D. Pollacco
The University of Warwick
F. J. Pozuelos
University of Liège
D. Queloz
University of Geneva
University of Cambridge
R. Ragazzoni
Istituto nazionale di astrofisica (INAF)
University of Padua
N. Rando
European Space Agency (ESA)
H. Rauer
Technische Universität Berlin
German Aerospace Center (DLR)
Freie Universität Berlin
C. Reimers
University of Vienna
I Ribas
Spanish National Research Council (CSIC)
Institute of Space Studies of Catalonia (IEEC)
S. Salmon
University of Geneva
N. C. Santos
Spanish National Research Council (CSIC)
University of Porto
G. Scandariato
Istituto nazionale di astrofisica (INAF)
A. E. Simon
University of Bern
A. M. S. Smith
German Aerospace Center (DLR)
M. Steller
Austrian Academy of Sciences
Swayne
Keele University
Gy M. Szabo
Eötvös Loránd University (ELTE)
D. Segransan
University of Geneva
N. Thomas
University of Bern
S. Udry
University of Geneva
V. Van Grootel
University of Liège
N. A. Walton
University of Cambridge
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 514 1 77-104Subject Categories
Aerospace Engineering
Astronomy, Astrophysics and Cosmology
Other Physics Topics
DOI
10.1093/mnras/stab3371