Maxted, PFL, Ehrenreich, D, Wilson, TG, Alibert, Y, Cameron, AC, Hoyer, S, Sousa, SG, Olofsson, G, Bekkelien, A, Deline, A, Delrez, L, Bonfanti, A, Borsato, L, Alonso, R, Escudé, GA, Barrado, D, Barros, SCC, 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, CC, Csizmadia, S, Davies, MB, Deleuil, M, Demangeon, ODS, Demory, B-O, Erikson, A, Florén, HG, Fortier, A, Fossati, L, Fridlund, M, Futyan, D, Gandolfi, D, Gillon, M, Guedel, M, Guterman, P, Heng, K, Isaak, KG, Kiss, L, Laskar, J, Etangs, ALD, Lendl, M, Lovis, C, Magrin, D, Nascimbeni, V, Ottensamer, R, Pagano, I, Pallé, E, Peter, G, Piotto, G, Pollacco, D, Pozuelos, FJ, Queloz, D, Ragazzoni, R, Rando, N, Rauer, H, Reimers, C, Ribas, I, Santos, NC, Scandariato, G, Simon, AE, Smith, AMS, Steller, M, Swayne, MI, Szabó, GM, Ségransan, D, Thomas, N, Udry, S, Van Grootel, V and Walton, NA (2021) Analysis of Early Science observations with the CHaracterising ExOPlanets Satellite (CHEOPS) using pycheops. Monthly Notices of the Royal Astronomical Society, 514 (1). pp. 77-104. ISSN 0035-8711

[thumbnail of 2111.08828.pdf]
2111.08828.pdf - Accepted Version

Download (7MB) | Preview


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.

Item Type: Article
Additional Information: © 2021 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (
Uncontrolled Keywords: methods: data analysis; software: data analysis; planets and satellites: fundamental parameters
Subjects: Q Science > Q Science (General)
Q Science > QA Mathematics
Q Science > QB Astronomy
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 15 Dec 2021 15:33
Last Modified: 21 Jul 2022 15:19

Actions (login required)

View Item
View Item