The CHEOPS mission
Artikel i vetenskaplig tidskrift, 2020

The CHaracterising ExOPlanet Satellite (CHEOPS) was selected on October 19, 2012, as the first small mission (S-mission) in the ESA Science Programme and successfully launched on December 18, 2019, as a secondary passenger on a Soyuz-Fregat rocket from Kourou, French Guiana. CHEOPS is a partnership between ESA and Switzerland with important contributions by ten additional ESA Member States. CHEOPS is the first mission dedicated to search for transits of exoplanets using ultrahigh precision photometry on bright stars already known to host planets. As a follow-up mission, CHEOPS is mainly dedicated to improving, whenever possible, existing radii measurements or provide first accurate measurements for a subset of those planets for which the mass has already been estimated from ground-based spectroscopic surveys. The expected photometric precision will also allow CHEOPS to go beyond measuring only transits and to follow phase curves or to search for exo-moons, for example. Finally, by unveiling transiting exoplanets with high potential for in-depth characterisation, CHEOPS will also provide prime targets for future instruments suited to the spectroscopic characterisation of exoplanetary atmospheres. To reach its science objectives, requirements on the photometric precision and stability have been derived for stars with magnitudes ranging from 6 to 12 in the V band. In particular, CHEOPS shall be able to detect Earth-size planets transiting G5 dwarf stars (stellar radius of 0.9R⊙) in the magnitude range 6 ≤ V ≤ 9 by achieving a photometric precision of 20 ppm in 6 hours of integration time. In the case of K-type stars (stellar radius of 0.7R⊙) of magnitude in the range 9 ≤ V ≤ 12, CHEOPS shall be able to detect transiting Neptune-size planets achieving a photometric precision of 85 ppm in 3 hours of integration time. This precision has to be maintained over continuous periods of observation for up to 48 hours. This precision and stability will be achieved by using a single, frame-transfer, back-illuminated CCD detector at the focal plane assembly of a 33.5 cm diameter, on-axis Ritchey-Chrétien telescope. The nearly 275 kg spacecraft is nadir-locked, with a pointing accuracy of about 1 arcsec rms, and will allow for at least 1 Gbit/day downlink. The sun-synchronous dusk-dawn orbit at 700 km altitude enables having the Sun permanently on the backside of the spacecraft thus minimising Earth stray light. A mission duration of 3.5 years in orbit is foreseen to enable the execution of the science programme. During this period, 20% of the observing time is available to the wider community through yearly ESA call for proposals, as well as through discretionary time approved by ESA’s Director of Science. At the time of this writing, CHEOPS commissioning has been completed and CHEOPS has been shown to fulfill all its requirements. The mission has now started the execution of its science programme.

CHEOPS

High-precision transit photometry

Exoplanets

Small mission

Författare

W. Benz

Universität Bern

C. Broeg

Universität Bern

A. Fortier

Universität Bern

N. Rando

European Space Research and Technology Centre (ESA ESTEC)

T. Beck

Universität Bern

M. Beck

Universite de Geneve

D. Queloz

Universite de Geneve

D. Ehrenreich

Universite de Geneve

P. Maxted

Keele University

K. Isaak

European Space Research and Technology Centre (ESA ESTEC)

N. Billot

Universite de Geneve

Y. Alibert

Universität Bern

R. Alonso

Instituto Astrofisico de Canarias

C. António

DEIMOS Engenharia

J. Asquier

European Space Research and Technology Centre (ESA ESTEC)

T. Bandy

Universität Bern

T. Bárczy

Admatis

D. Barrado

Centro de Astrobiologia (CAB)

S.C.C. Barros

Universidade do Porto

W. Baumjohann

Institut fur Weltraumforschung

A. Bekkelien

Universite de Geneve

M. Bergomi

Osservatorio Astronomico di Padova

F. Biondi

Osservatorio Astronomico di Padova

X. Bonfils

Université Grenoble Alpes

L. Borsato

Osservatorio Astronomico di Padova

A. Brandeker

Stockholms universitet

M.-D. Busch

Universität Bern

J. Cabrera

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

V. Cessa

Universität Bern

S. Charnoz

Institut de Physique du Globe de Paris

B. Chazelas

Universite de Geneve

A. Collier Cameron

University of St Andrews

C. Corral Van Damme

European Space Research and Technology Centre (ESA ESTEC)

D. Cortes

Airbus Group

Melvyn B. Davies

Lunds universitet

M. Deleuil

Laboratoire d'Astrophysique de Marseille

A. Deline

Universite de Geneve

L. Delrez

Universite de Liège

O. Demangeon

Universidade do Porto

B.O. Demory

Universität Bern

Anders Erikson

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

J. Farinato

Osservatorio Astronomico di Padova

L. Fossati

Institut fur Weltraumforschung

Malcolm Fridlund

Universiteit Leiden

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Galaktisk astrofysik

D. Futyan

Universite de Geneve

D. Gandolfi

Universita degli Studi di Torino

A. Garcia Munoz

Technische Universität Berlin

Michaël Gillon

Universite de Liège

P. Guterman

Laboratoire d'Astrophysique de Marseille

A. Gutierrez

DEIMOS Engenharia

J. Hasiba

Institut fur Weltraumforschung

Kevin Heng

Universität Bern

E. Hernandez

Universität Bern

S. Hoyer

Laboratoire d'Astrophysique de Marseille

L.L. Kiss

Magyar Tudomanyos Akademia

Z. Kovacs

Admatis

T. Kuntzer

Universite de Geneve

J. Laskar

Observatoire de Paris

A. L. des Etangs

Institut d 'Astrophysique de Paris

M. Lendl

Universite de Geneve

A. López

Airbus Group

I. Lora

Instituto Nacional de Tecnica Aeroespacial

C. Lovis

Universite de Geneve

T. Lüftinger

Universität Wien

D. Magrin

Osservatorio Astronomico di Padova

L. Malvasio

Universität Bern

L. Marafatto

Osservatorio Astronomico di Padova

H. Michaelis

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

D. de Miguel

Airbus Group

D. Modrego

Instituto Nacional de Tecnica Aeroespacial

M. Munari

Osservatorio Astrofisico di Catania

Valerio Nascimbeni

Università di Padova

G. Olofsson

Stockholms universitet

H. Ottacher

Institut fur Weltraumforschung

R. Ottensamer

Universität Wien

I. Pagano

Osservatorio Astrofisico di Catania

R. Palacios

Airbus Group

E. Palle

Instituto Astrofisico de Canarias

G. Peter

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

D. Piazza

Universität Bern

Giampaolo P. Piotto

Osservatorio Astronomico di Padova

A. Pizarro

Airbus Group

D. Pollaco

The University of Warwick

Roberto Ragazzoni

Osservatorio Astronomico di Padova

F. Ratti

European Space Research and Technology Centre (ESA ESTEC)

H. Rauer

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

I. Ribas

Universitat Autonoma de Barcelona (UAB)

M. Rieder

Universität Bern

R. Rohlfs

Universität Bern

F. Safa

European Space Research and Technology Centre (ESA ESTEC)

M. Salatti

Agenzia Spaziale Italiana

N. C. Santos

Universidade do Porto

Gaetano Scandariato

Osservatorio Astrofisico di Catania

D. Segransan

Universite de Geneve

A.E. Simon

Universität Bern

Alexis M. S. Smith

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

M. Sordet

Universite de Geneve

S.G. Sousa

Universidade do Porto

Manfred B. Steller

Institut fur Weltraumforschung

G.M. Szabó

Magyar Tudomanyos Akademia

J. Szoke

Admatis

Nicolas Thomas

Universität Bern

M. Tschentscher

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

S. Udry

Universite de Geneve

V. Van Grootel

Universite de Liège

V. Viotto

Osservatorio Astronomico di Padova

I. Walter

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

N. A. Walton

University of Cambridge

F. Wildi

Universite de Geneve

D. Wolter

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Experimental Astronomy

0922-6435 (ISSN) 1572-9508 (eISSN)

Vol. In Press

Ämneskategorier

Rymd- och flygteknik

Astronomi, astrofysik och kosmologi

Annan fysik

Infrastruktur

Onsala rymdobservatorium

DOI

10.1007/s10686-020-09679-4

Mer information

Senast uppdaterat

2020-11-19