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 77-104

Subject Categories

Aerospace Engineering

Astronomy, Astrophysics and Cosmology

Other Physics Topics

DOI

10.1093/mnras/stab3371

More information

Latest update

9/15/2023