The CHEOPS mission

Abstract

The CHaracterising ExOPlanet Satellite (CHEOPS) was selected in 2012, as the first small mission in the ESA Science Programme and successfully launched in December 2019. 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 and to following phase curves. CHEOPS will provide prime targets for future spectroscopic atmospheric characterisation. 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 in the magnitude range between 6 and 9 by achieving a photometric precision of 20 ppm in 6 hours of integration. For K stars in the magnitude range between 9 and 12, CHEOPS shall be able to detect transiting Neptune-size planets achieving a photometric precision of 85 ppm in 3 hours of integration. This is achieved by using a single, frame-transfer, back-illuminated CCD detector at the focal plane assembly of a 33.5 cm diameter telescope. The 280 kg spacecraft has a pointing accuracy of about 1 arcsec rms and orbits on a sun-synchronous dusk-dawn orbit at 700 km altitude. The nominal mission lifetime is 3.5 years. During this period, 20% of the observing time is available to the community through a yearly call and a discretionary time programme managed by ESA.

arXiv commentSubmitted to Experimental Astronomy

References in corpus (23)

• emcee: The MCMC Hammer
• Gaia Data Release 2. Summary of the contents and survey properties
• The PLATO 2.0 Mission
• Kepler Mission Design, Realized Photometric Performance, and Early Science
• Fast and scalable Gaussian process modeling with applications to astronomical time series
• Growth Model Interpretation of Planet Size Distribution
• The connection between stellar granulation and oscillation as seen by the Kepler mission
• The Derivation, Properties and Value of Kepler's Combined Differential Photometric Precision
• Detection of a transit of the super-Earth 55 Cnc e with Warm Spitzer
• Observational Evidence for Tidal Destruction of Exoplanets
• Understanding Trends Associated with Clouds in Irradiated Exoplanets
• Expected performances of the Characterising Exoplanet Satellite (CHEOPS) III. Data reduction pipeline: architecture and simulated performances
• Elemental ratios in stars vs planets
• Systematic Phase Curve Study of Known Transiting Systems from Year 1 of the TESS Mission
• Comparison of the power-2 limb-darkening law from the Stagger-grid to Kepler light curves of transiting exoplanets
• KELT-11b: A Highly Inflated Sub-Saturn Exoplanet Transiting the V=8 Subgiant HD 93396
• Exoplanet Characterization by Multi-Observatory Transit Photometry with TESS and CHEOPS
• Retrieval of the fluid Love number $k_2$ in exoplanetary transit curves
• Detectability of shape deformation in short-period exoplanets
• qpower2 - a fast and accurate algorithm for the computation of exoplanet transit light curves with the power-2 limb-darkening law
• Mitigating flicker noise in high-precision photometry. I -- Characterization of the noise structure, impact on the inferred transit parameters, and predictions for CHEOPS observations
• Expected performances of the Characterising Exoplanet Satellite (CHEOPS). I. Photometric performances from ground-based calibration
• Expected performances of the Characterising Exoplanet Satellite (CHEOPS) II. The CHEOPS simulator

Cited by in corpus (170)

• Six transiting planets and a chain of Laplace resonances in TOI-178
• Stellar obliquities in exoplanetary systems
• The nature and origins of sub-Neptune size planets
• SWEET-Cat 2.0: The Cat just got SWEETer; Higher quality spectra and precise parallaxes from GAIA eDR3
• Transit detection of the long-period volatile-rich super-Earth ${\nu }^2$ Lupi d with $CHEOPS$
• CHEOPS observations of the HD 108236 planetary system: A fifth planet, improved ephemerides, and planetary radii
• Analysis of Early Science observations with the CHaracterising ExOPlanets Satellite (CHEOPS) using pycheops
• ExoClock Project III: 450 new exoplanet ephemerides from ground and space observations
• A resonant sextuplet of sub-Neptunes transiting the bright star HD 110067
• The atmosphere and architecture of WASP-189 b probed by its CHEOPS phase curve
• A fading radius valley towards M-dwarfs, a persistent density valley across stellar types
• A pair of Sub-Neptunes transiting the bright K-dwarf TOI-1064 characterised with CHEOPS
• Large Interferometer For Exoplanets (LIFE): II. Signal simulation, signal extraction and fundamental exoplanet parameters from single epoch observations
• CHEOPS Precision Phase Curve of the Super-Earth 55 Cnc e
• The Ariel Target List: The Impact of TESS and the Potential for Characterising Multiple Planets Within a System
• The young HD 73583 (TOI-560) planetary system: Two 10-M${}_{\oplus }$ mini-Neptunes transiting a 500-Myr-old, bright, and active K dwarf
• CHEOPS geometric albedo of the hot Jupiter HD 209458b
• Detection of the tidal deformation of WASP-103b at $3\sigma$ with CHEOPS
• Spi-OPS: Spitzer and CHEOPS confirm the near-polar orbit of MASCARA-1 b and reveal a hint of dayside reflection
• A detailed analysis of the Gl 486 planetary system
• Uncovering the true periods of the young sub-Neptunes orbiting TOI-2076
• MPS-ATLAS: A fast all-in-one code for synthesising stellar spectra
• Investigating the architecture and internal structure of the TOI-561 system planets with CHEOPS, HARPS-N and TESS
• Obliquities of Exoplanet Host Stars: 19 New and Updated Measurements, and Trends in the Sample of 205 Measurements
• HD 23472: A multi-planetary system with three super-Earths and two potential super-Mercuries
• A Second Earth-Sized Planet in the Habitable Zone of the M Dwarf, TOI-700
• An Unusual Transmission Spectrum for the Sub-Saturn KELT-11b Suggestive of a Sub-Solar Water Abundance
• The geometric albedo of the hot Jupiter HD 189733b measured with CHEOPS
• TOI-5005 b: A super-Neptune in the savanna near the ridge
• A transit survey to search for planets around hot subdwarfs: I. methods and performance tests on light curves from Kepler, K2, TESS, and CHEOPS
• Searching for flaring star-planet interactions in AU Mic TESS observations
• Exoplanet Characterization using Conditional Invertible Neural Networks
• Properties of the radius valley around low mass stars: Predictions from the core-powered mass-loss mechanism
• The EBLM project -- VIII. First results for M-dwarf mass, radius and effective temperature measurements using CHEOPS light curves
• TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf
• Examining the orbital decay targets KELT-9 b, KELT-16 b and WASP-4 b, and the transit-timing variations of HD 97658 b
• Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS) VII. Detection of sodium on the long-transiting inflated sub-Saturn KELT-11 b
• A Mini-Neptune from TESS and CHEOPS Around the 120 Myr Old AB Dor member HIP 94235
• Transmission spectroscopy of MASCARA-1b with ESPRESSO: Challenges of overlapping orbital and Doppler tracks
• A new dynamical modeling of the WASP-47 system with CHEOPS observations
• The PLATO field selection process. II. Characterization of LOPS2, the first long-pointing field
• A sub-Earth-mass planet orbiting Barnard's star
• The stable climate of KELT-9b
• Unveiling the internal structure and formation history of the three planets transiting HIP 29442 (TOI-469) with CHEOPS
• The phase curve and the geometric albedo of WASP-43b measured with CHEOPS, TESS and HST WFC3/UVIS
• Revisiting K2-233 spectroscopic time-series with multidimensional Gaussian Processes
• Connecting photometric and spectroscopic granulation signals with CHEOPS and ESPRESSO
• TOI-5678 b: A 48-day transiting Neptune-mass planet characterized with CHEOPS and HARPS
• Improved radius determinations for the transiting brown dwarf population in the era of Gaia and TESS
• Planetary system around LTT 1445A unveiled by ESPRESSO: Multiple planets in a triple M-dwarf system
• Bioverse: The Habitable Zone Inner Edge Discontinuity as an Imprint of Runaway Greenhouse Climates on Exoplanet Demographics
• Two Warm Neptunes transiting HIP 9618 revealed by TESS & Cheops
• Investigating the visible phase-curve variability of 55 Cnc e
• Transit timing variations of AU Microscopii b and c
• 55 Cancri e's occultation captured with CHEOPS
• Two super-Earths at the edge of the habitable zone of the nearby M dwarf TOI-2095
• Evidence for Primordial Alignment: Insights from Stellar Obliquity Measurements for Compact Sub-Saturn Systems
• Mitigating stellar activity jitter with different line lists for least-squares deconvolution: analysis of a parametric and a randomised line selection
• Characterization of a set of small planets with TESS and CHEOPS and an analysis of photometric performance
• CHEOPS finds KELT-1b darker than expected in visible light: Discrepancy between the CHEOPS and TESS eclipse depths
• PlatoSim: An end-to-end PLATO camera simulator for modelling high-precision space-based photometry
• The SOPHIE search for northern extrasolar planets-XIX. A system including a cold sub-Neptune potentially transiting a V = 6.5 star HD88986
• A CHEOPS White Dwarf Transit Search
• The SHERLOCK pipeline: new exoplanet candidates in the WASP-16, HAT-P-27, HAT-P-26, and TOI-2411 systems
• The HD 93963 A transiting system: A 1.04d super-Earth and a 3.65 d sub-Neptune discovered by TESS and CHEOPS
• CORALIE radial-velocity search for companions around evolved stars (CASCADES). I. Sample definition and first results: Three new planets orbiting giant stars
• Characterisation of the Warm-Jupiter TOI-1130 system with CHEOPS and photo-dynamical approach
• The Spin-Orbit Alignment of 8 Warm Gas Giant Systems
• A full transit of ${\nu }^2$ Lupi d and the search for an exomoon in its Hill sphere with CHEOPS
• The EBLM project -- IX. Five fully convective M-dwarfs, precisely measured with CHEOPS and TESS light curves
• Fundamental Properties of Late-Type Stars in Eclipsing Binaries
• Irradiance Variations of the Sun and Sun-Like Stars -- Overview of Topical Collection
• NEID Reveals that The Young Warm Neptune TOI-2076 b Has a Low Obliquity
• The sulphur species in hot rocky exoplanet atmospheres
• A CHEOPS-enhanced view of the HD3167 system
• Power of wavelets in analyses of transit and phase curves in the presence of stellar variability and instrumental noise. II. Accuracy of the transit parameters
• Terminus: A Versatile Simulator for Space-based Telescopes
• Giant Outer Transiting Exoplanet Mass (GOT 'EM) Survey: III. Recovery and Confirmation of a Temperate, Mildly Eccentric, Single-Transit Jupiter Orbiting TOI-2010
• Rossiter-McLaughlin detection of the 9-month period transiting exoplanet HIP41378 d
• Refined parameters of the HD 22946 planetary system and the true orbital period of planet d
• Refining the properties of the TOI-178 system with CHEOPS and TESS
• A possible misaligned orbit for the young planet AU Mic c
• A stellar occultation by the transneptunian object (50000) Quaoar observed by CHEOPS
• TESS and CHEOPS Discover Two Warm Sub-Neptunes Transiting the Bright K-dwarf HD 15906
• Gravity darkening and tidally perturbed stellar pulsation in the misaligned exoplanet system WASP-33
• CHEOPS and TESS view of the ultra-short period super-Earth TOI-561 b
• Fundamental effective temperature measurements for eclipsing binary stars -- III. SPIRou near-infrared spectroscopy and CHEOPS photometry of the benchmark G0V star EBLM J0113+31
• A 16 Hour Transit of Kepler-167 e Observed by the Ground-based Unistellar Telescope Network
• Dark Exoplanets
• TESS Timings of 31 Hot Jupiters with Ephemeris Uncertainties
• Effects of flares on the habitable zones of M dwarfs accessible to TESS planet detections
• Looking For Timing Variations in the Transits of 16 Exoplanets
• A review of planetary systems around HD 99492, HD 147379 and HD 190007 with HARPS-N
• A closer look at LTT 9779b: The ESPRESSO endeavour to pierce the atmospheric veil
• TOI-1055 b: Neptunian planet characterised with HARPS, TESS, and CHEOPS
• Characterization of the HD 108236 system with CHEOPS and TESS. Confirmation of a fifth transiting planet
• Photo-dynamical characterisation of the TOI-178 resonant chain
• A close outer companion to the ultra-hot Jupiter TOI-2109 b?
• One-dimensional Convolutional Neural Networks for Detecting Transiting Exoplanets
• The apparent tidal decay of WASP-4 b can be explained by the Rømer effect
• Characterization of seven transiting systems including four warm Jupiters from SOPHIE and TESS
• ATREIDES I. Embarking on a trek across the exo-Neptunian landscape with the TOI-421 system
• Imaging of exocomets with infrared interferometry
• Dark skies of the slightly eccentric WASP-18 b from its optical-to-infrared dayside emission
• Hydride ion continuum hides absorption signatures in the NIRPS near-infrared transmission spectrum of the ultra-hot gas giant WASP-189b
• Discovery of TOI-1260d and the characterisation of the multi-planet system
• Rapidly rotating stars and their transiting planets: KELT-17b, KELT-19Ab, and KELT-21b in the CHEOPS and TESS era
• Measuring the Temperature of Starspots from Multi-Filter Photometry
• Discovery of a cold giant planet and mass measurement of a hot super-Earth in the multi-planetary system WASP-132
• Exploiting the transit timing capabilities of Ariel
• A search for transiting planets around hot subdwarfs II. Supplementary methods and results from TESS Cycle 1
• Predicting convective blueshift and radial-velocity dispersion due to granulation for FGK stars
• A High Geometric Albedo for LTT9779b Points Towards a Metal-rich Atmosphere and Silicate Clouds
• CHEOPS's hunt for exocomets: photometric observations of 5 Vul
• Discovery of a substellar companion in the TESS light curve of the $\delta$ Scuti/$\gamma$ Doradus hybrid pulsator HD 31221
• Radii, masses, and transit-timing variations of the three-planet system orbiting the naked-eye star TOI-396
• Converting the sub-Jovian desert of exoplanets to a savanna with TESS, PLATO and Ariel
• Searching for Hot Water World Candidates with CHEOPS: Refining the radii and analysing the internal structures and atmospheric lifetimes of TOI-238 b and TOI-1685 b
• Precise characterisation of HD 15337 with CHEOPS: a laboratory for planet formation and evolution
• The "Drake equation" of exomoons -- a cascade of formation, stability and detection
• Detecting and Monitoring Tidal Dissipation of Hot Jupiters in the Era of SiTian
• Tentative Evidence for Transit Timing Variations of WASP-161b
• The K2-24 planetary system revisited by CHEOPS
• The changing transit shape of TOI-3884 b
• NLTE atmospheric modelling of the ultra-hot Jupiter WASP-178b and comparison with UV and optical observations
• A Disintegrating Rocky World Shrouded in Dust and Gas: Mid-IR Observations of K2-22b using JWST
• The ESPRESSO transmission spectrum of HD189733b : Extracting the planetary sodium and lithium signatures amid stellar contamination
• A transiting multi-planet system in the 61 million year old association Theia 116
• HIP 41378 observed by CHEOPS: Where is planet d?
• A CHEOPS Search for Massive, Long-Period Companions to the Warm Jupiter K2-139 b
• Null transit detections of 68 radial velocity exoplanets observed by TESS
• Enhancing the detection of low-energy M dwarf flares: Wavelet-based denoising of CHEOPS data
• A joint effort to discover and characterize two resonant mini Neptunes around TOI-1803 with TESS, HARPS-N and CHEOPS
• Transit Timing Variations in HIP 41378: CHEOPS and TESS confirm a non-transiting sixth planet in the system
• Comprehensive analysis of TESS Full Orbital Phase Curve of WASP-121b
• What if we find nothing? Bayesian analysis of the statistical information of null results in future exoplanet habitability and biosignature surveys
• Super-Earth masses and stellar abundances from NIRPS reveal tentative evidence for water-rich formation around M dwarfs
• In-situ observations of resident space objects with the CHEOPS space telescope
• The CHEOPS view on the climate of WASP-3 b
• Confronting compositional confusion through the characterisation of the sub-Neptune orbiting HD 77946
• CHEOPS observations confirm nodal precession in the WASP-33 system
• Yuti: A General-purpose Transit Simulator for Arbitrary Shaped Objects Orbiting Stars
• Glancing through the debris disk: Photometric analysis of DE Boo with CHEOPS
• Planetary architectures under the influence of a stellar binary
• Taranga DR1: Analysis of TESS Short Cadence data for years 1 and 2
• Gas-depleted planet formation occurred in the four-planet system around the red dwarf LHS 1903
• The Effect of Atmospheric Chemistry on the Optical Geometric Albedos of Hot Jupiters
• The CHEOPS view of HD 95338b: refined transit parameters, and a search for exomoons
• A Cool Earth-sized Planet Candidate Transiting a Tenth Magnitude K-dwarf From K2
• The changing face of AU Mic b: stellar spots, spin-orbit commensurability, and Transit Timing Variations as seen by CHEOPS and TESS
• TIC 172900988: A Transiting Circumbinary Planet Detected in One Sector of TESS Data
• ASTEP confirmation of a pair of long-period Jupiter-sized planets with extremely low densities transiting TOI-791
• An Adolescent and Near-Resonant Planetary System Near the End of Photoevaporation
• The multi-planet system TOI-5624: Four transiting sub-Neptunes with an outer companion revealed by transit-timing variations
• TESS phase curve of ultra-hot Jupiter WASP-189 b
• Comparing the Sun to Sun-like stars. On the importance of addressing faculae/spot domination
• The GAPS programme at TNG LXXI. A sub-Neptune suitable for atmospheric characterization in a multiplanet and mutually inclined system orbiting the bright K dwarf TOI-5789 (HIP 99452)
• Discovery of a multi-planetary system orbiting the aged Sun-like star HD 224018
• Improved characterization of the TOI-2141 system: a dense sub-Neptune with non-transiting inner and outer companions
• Multicolour Validation of Two Temperate Mini-Neptunes Around M-dwarf Habitable Zones
• HD 715 b, a Warm Jupiter Orbiting a Massive Subgiant Discovered from a Single TESS Transit
• K2-99 revisited: a non-inflated warm Jupiter, and a temperate giant planet on a 522-d orbit around a subgiant
• Panopticon: a novel deep learning model to detect single transit events with no prior data filtering in PLATO light curves
• Hidden water in magma ocean exoplanets
• Constraining stellar rotation and planetary atmospheric evolution of a dozen systems hosting sub-Neptunes and super-Earths
• Spin-Orbit Geometry of AU Mic b and c from Back-to-Back Transits Observed Contemporaneously with Magellan PFS, LCOGT, and CHEOPS
• TOI-1201 b: A mini-Neptune transiting a bright and moderately young M dwarf
• No random transits in CHEOPS observations of HD 139139
• The Longest-period Young Transiting Exoplanets. A Duo of Puffy Giants inside a Debris Disk
• JWST unveils a high mean molecular weight atmosphere for mini-Neptune TOI-1130b: Evidence for formation beyond the water ice line