CE49 - Planétologie, structure et histoire de la Terre

PREparing Jupiter's SyStem Exploration with JWST – PRESSE

Trumbo et al. 2023. Hydrogen peroxide at the poles of Ganymede. Science Advances, 9, 29. 10.1126/sciadv.adg3724

de Pater et al. 2023. An Energetic Eruption With Associated SO 1.707 Micron Emissions at Io's Kanehekili Fluctus and a Brightening Event at Loki Patera Observed by JWST. JGR, 128, 8. 10.1029/2023JE007872

Hueso et al. 2023. An intense narrow equatorial jet in Jupiter's lower stratosphere observed by JWST. Nature Astronomy,10.1038/s41550-023-02099-2.


Press release regarding the project :


Submission summary

The 2020 decade will see the launch of two space missions, NASA's Europa-Clipper and ESA's JUICE, dedicated to the in-depth exploration of the Jupiter system. This broad international interest in studying the Jupiter system is fuelled by i) Jupiter's status as an archetypal gas giant planet, ii) Io's volcanic activity comparable to that of young telluric planets, iii) the structure and composition of Europa and Ganymede, archetypal ocean worlds. Based on the first JWST observations of the Jupiter system for which the coordinator is CoPI, as well as some observations of Saturn, the PRESSE project aims to prepare the French planetological community to embark on these space missions by addressing fundamental questions on the dynamics and chemical composition of these objects, and by training young scientists who will participate in the next exploration of the Jupiter system.
Indeed, while many missions have flown or orbited Jupiter and its satellites, limitations in spectral resolution, spectral coverage and sensitivity of the on-board instruments have limited the determination of the chemical diversity of Jupiter's atmosphere, and the atmospheres and surfaces of Io and Ganymede. The JWST space telescope, thanks to its spectral resolution, spectral coverage, especially in wavelength ranges inaccessible from the ground, angular resolution, and above all its outstanding sensitivity, opens up exceptional opportunities to probe the chemical diversity of these objects on the surface and in their atmosphere.
Through the search for and mapping of chemical species, we will seek to answer the following questions:
What are the relative contributions of ion-induced chemistry and photochemistry in the production of hydrocarbons in Jupiter's stratosphere?
What are the physico-chemical conditions of Io's lavas and what is the composition of the mantle of Io?
What is the dominant source of Io's atmosphere, sublimation or volcanism?
What are the relative sources of non-ice compounds on the surface of Io, and what do they tell us about the transport between the ocean and the ice shell, and about the wheathering of the surface materials?
What is the main source of Ganymede's atmosphere, sublimation or sputtering?

Project coordination

Thierry Fouchet (Laboratoire d'études spatiales et d'instrumentation en astrophysique)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.


IPAG Institut de Planétologie et d'Astrophysique de Grenoble
LATMOS Laboratoire "Atmosphères, Milieux, Observations Spatiales"
LESIA Laboratoire d'études spatiales et d'instrumentation en astrophysique
LMD Laboratoire de météorologie dynamique

Help of the ANR 545,552 euros
Beginning and duration of the scientific project: January 2022 - 48 Months

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