Bibliographic Details
| Title: |
Expected performances of the Characterising Exoplanet Satellite (CHEOPS). I. Photometric performances from ground-based calibration |
| Authors: |
Deline, Adrien, Queloz, Didier, Chazelas, Bruno, Sordet, Michaël, Wildi, François, Fortier, Andrea, Broeg, Christopher, Futyan, David, Benz, Willy |
| Source: |
A&A 635, A22 (2020) |
| Publication Year: |
2019 |
| Collection: |
Astrophysics |
| Subject Terms: |
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Earth and Planetary Astrophysics |
| More Details: |
The Characterising Exoplanet Satellite (CHEOPS) is a space mission designed to perform photometric observations of bright stars to obtain precise radii measurements of transiting planets. The high-precision photometry of CHEOPS relies on careful on-ground calibration of its payload. For that purpose, intensive pre-launch campaigns of measurements were carried out to calibrate the instrument and characterise its photometric performances. We report on main results of these campaigns, provide a complete analysis of data sets and estimate in-flight photometric performance by mean of end-to-end simulation. The on-ground photometric stability of the instrument is found to be of the order of 15 parts per million over 5 hours. Our end-to-end simulation shows that measurements of planet-to-star radii ratio with CHEOPS can be determined with a precision of 2% for a Neptune-size planet transiting a K-dwarf star and 5% for an Earth-size planet orbiting a Sun-like star. It corresponds to signal-to-noise ratios on the transit depths of 25 and 10 respectively, allowing the characterisation and detection of these planets. The pre-launch CHEOPS performances are shown to be compliant with the mission requirements.
Comment: 12 pages, 14 figures, accepted for publication in A&A |
| Document Type: |
Working Paper |
| DOI: |
10.1051/0004-6361/201935977 |
| Access URL: |
http://arxiv.org/abs/1908.01636 |
| Accession Number: |
edsarx.1908.01636 |
| Database: |
arXiv |
