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Cessa, Virginie and Beck, Thomas and Benz, Willi and Broeg, Chris and Ehrenreich, David and Fortier, Andrea and Peter, Gisbert and Magrin, D. and Pagano, Isabella and Plesseria, J.-Y. and Steller, Manfred and Szoke, J. and Thomas, Nick and Ragazzoni, Roberto and Wildi, F. (2014) CHEOPS: A SPACE TELESCOPE FOR ULTRA-HIGH PRECISION PHOTOMETRY OF EXOPLANET TRANSITS. ICSO 2014 (International Conference on Space Optics), 07.-10. Dez. 2014, Tenerife, Spain.

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The CHaracterising ExOPlanet Satellite (CHEOPS) is a joint ESA-Switzerland space mission dedicated to search for exoplanet transits by means of ultra-high precision photometry whose launch readiness is expected end 2017. The CHEOPS instrument will be the first space telescope dedicated to search for transits on bright stars already known to host planets. By being able to point at nearly any location on the sky, it will provide the unique capability of determining accurate radii for a subset of those planets for which the mass has already been estimated from ground-based spectroscopic surveys. CHEOPS will also provide precision radii for new planets discovered by the next generation ground-based transits surveys (Neptune-size and smaller). The main science goals of the CHEOPS mission will be to study the structure of exoplanets with radii typically ranging from 1 to 6 Earth radii orbiting bright stars. With an accurate knowledge of masses and radii for an unprecedented sample of planets, CHEOPS will set new constraints on the structure and hence on the formation and evolution of planets in this mass range. To reach its goals CHEOPS will measure photometric signals with a precision of 20 ppm in 6 hours of integration time for a 9th magnitude star. This corresponds to a signal to noise of 5 for a transit of an Earth-sized planet orbiting a solar-sized star (0.9 solar radii). This precision will be achieved by using a single frame-transfer backside illuminated CCD detector cool down at 233K and stabilized within ~10 mK . The CHEOPS optical design is based on a Ritchey-Chretien style telescope with 300 mm effective aperture diameter, which provides a defocussed image of the target star while minimizing straylight using a dedicated field stop and baffle system. As CHEOPS will be in a LEO orbit, straylight suppression is a key point to allow the observation of faint stars. The telescope will be the only payload on a spacecraft platform providing pointing stability of < 8 arcsec rms, power of 60W for instrument operations and downlink transmission of at least 1.2GBit/day. Both CHEOPS paylaod and platform will rely mainly on components with flight heritage. The baseline CHEOPS mission fits within the technical readiness requirements, short development time and the cost envelope defined by ESA in its first call for S-missions. It represents a breakthrough opportunity in furthering our understanding of the formation and evolution of planetary systems.

Item URL in elib:https://elib.dlr.de/92672/
Document Type:Conference or Workshop Item (Speech)
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Cessa, VirginieUniversity of Berne, SwitzerlandUNSPECIFIED
Beck, ThomasUniversity of Berne, SwitzerlandUNSPECIFIED
Benz, WilliUniversity of Berne, SwitzerlandUNSPECIFIED
Broeg, ChrisUniversity of Berne, SwitzerlandUNSPECIFIED
Ehrenreich, DavidUniversity of Geneva, SwitzerlandUNSPECIFIED
Fortier, AndreaUniversity of Berne, SwitzerlandUNSPECIFIED
Peter, GisbertDLR Institute of Optical Sensor Systems, GermanyUNSPECIFIED
Magrin, D.Osservatorio Astronomico di Padova – INAF, ItalyUNSPECIFIED
Pagano, IsabellaOsservatorio Astrofisico di Catania – INAF, ItalyUNSPECIFIED
Plesseria, J.-Y.Centre Spatial de Liège, BelgiumUNSPECIFIED
Steller, ManfredSpace Research Institute, AustriaUNSPECIFIED
Szoke, J.Admatis, HungaryUNSPECIFIED
Thomas, NickUniversity of Berne, SwitzerlandUNSPECIFIED
Ragazzoni, RobertoOsservatorio Astronomico di Padova – INAF, ItalyUNSPECIFIED
Wildi, F.University of Geneva, SwitzerlandUNSPECIFIED
Date:7 October 2014
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Exoplanet, high precision photometry, CCD
Event Title:ICSO 2014 (International Conference on Space Optics)
Event Location:Tenerife, Spain
Event Type:international Conference
Event Dates:07.-10. Dez. 2014
Organizer:ESA, CNES, IAC, DLR, OSA
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Explorationsstudien
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems
Deposited By: Peter, Gisbert
Deposited On:01 Dec 2014 07:33
Last Modified:01 Dec 2014 07:33

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