Analysis of Early Science observations with the CHaracterising ExOPlanets Satellite (CHEOPS) using pycheops
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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.
Maxted , P F L , Ehrenreich , D , Wilson , T G , Alibert , Y , Cameron , A C , Hoyer , S , Sousa , S G , Olofsson , G , Bekkelien , A , Deline , A , Delrez , L , Bonfanti , A , Borsato , L , Alonso , R , Escudé , G A , Barrado , D , Barros , S C C , Baumjohann , W , Beck , M , Beck , T , Benz , W , Billot , N , Biondi , F , Bonfils , X , Brandeker , A , Broeg , C , Bárczy , T , Cabrera , J , Charnoz , S , Van Damme , C C , Csizmadia , S , Davies , M B , Deleuil , M , Demangeon , O D S , Demory , B-O , Erikson , A , Florén , H G , Fortier , A , Fossati , L , Fridlund , M , Futyan , D , Gandolfi , D , Gillon , M , Guedel , M , Guterman , P , Heng , K , Isaak , K G , Kiss , L , Laskar , J , Lecavelier des Etangs , A , Lendl , M , Lovis , C , Magrin , D , Nascimbeni , V , Ottensamer , R , Pagano , I , Pallé , E , Peter , G , Piotto , G , Pollacco , D , Pozuelos , F J , Queloz , D , Ragazzoni , R , Rando , N , Rauer , H , Reimers , C , Ribas , I , Santos , N C , Scandariato , G , Simon , A E , Smith , A M S , Steller , M , Swayne , M I , Szabó , G M , Ségransan , D , Thomas , N , Udry , S , Van Grootel , V & Walton , N A 2021 , ' Analysis of Early Science observations with the CHaracterising ExOPlanets Satellite ( CHEOPS ) using pycheops ' , Monthly Notices of the Royal Astronomical Society . https://doi.org/10.1093/mnras/stab3371
Monthly Notices of the Royal Astronomical Society
Copyright © 2021 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1093/mnras/stab3371
DescriptionFunding: ACC and TW acknowledge support from UK Science and Technologies Facilities Council (STFC) ST/R00824/1.
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