Analysis of Early Science observations with the CHaracterising ExOPlanets Satellite (CHEOPS) using pycheops

ABSTRACT 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 tr...

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Bibliographic Details
Published in:	Monthly notices of the Royal Astronomical Society Vol. 514; no. 1; pp. 77 - 104
Main Authors:	Maxted, P F L, Ehrenreich, D, Wilson, T G, Alibert, Y, Cameron, A Collier, Hoyer, S, Sousa, S G, Olofsson, G, Bekkelien, A, Deline, A, Delrez, L, Bonfanti, A, Borsato, L, Alonso, R, Anglada Escudé, G, 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, Corral Van Damme, C, Csizmadia, Sz, 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, Salmon, S, Santos, N C, Scandariato, G, Simon, A E, Smith, A M S, Steller, M, Swayne, M I, Szabó, Gy M, Ségransan, D, Thomas, N, Udry, S, Van Grootel, V, Walton, N A
Format:	Journal Article
Language:	English
Published:	United Kingdom Oxford University Press 2022 Oxford University Press (OUP): Policy P - Oxford Open Option A
Subjects:	Astronomi, astrofysik och kosmologi Astronomy, Astrophysics and Cosmology Astrophysics Astrophysics - Earth and Planetary Astrophysics Astrophysics - Instrumentation and Methods for Astrophysics Astrophysics - Solar and Stellar Astrophysics Aérospatiale, astronomie & astrophysique Fysik methods: data analysis Natural Sciences Naturvetenskap Physical Sciences Physical, chemical, mathematical & earth Sciences Physics Physique, chimie, mathématiques & sciences de la terre planets and satellites: fundamental parameters software: data analysis software: public release Space science, astronomy & astrophysics methods: data analysis software: data analysis planets and satellites: fundamental parameters
ISSN:	0035-8711, 1365-2966, 1365-2966
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Summary:	ABSTRACT 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.
Bibliography:	scopus-id:2-s2.0-85133372988 CEECIND/00826/2018; IF/01312/2014/CP1215/CT0004 USDOE Office of Nuclear Energy (NE), Nuclear Fuel Cycle and Supply Chain
ISSN:	0035-8711 1365-2966 1365-2966
DOI:	10.1093/mnras/stab3371