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Analysis of Early Science observations with the CHaracterising ExOPlanets Satellite (CHEOPS) using pycheops
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Number of Authors: 802022 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 514, no 1, p. 77-104Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2022. Vol. 514, no 1, p. 77-104
Keywords [en]
methods: data analysis, software: data analysis, planets and satellites: fundamental parameters
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-207289DOI: 10.1093/mnras/stab3371ISI: 000807738000001OAI: oai:DiVA.org:su-207289DiVA, id: diva2:1682848
Available from: 2022-07-12 Created: 2022-07-12 Last updated: 2022-07-12Bibliographically approved

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Olofsson, GöranBrandeker, AlexisFlorén, Hans Gustav

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