Hydrogen peroxide at the poles of Ganymede

Author:

Trumbo Samantha K.1ORCID,Brown Michael E.2ORCID,Bockelée-Morvan Dominique3ORCID,de Pater Imke4ORCID,Fouchet Thierry3ORCID,Wong Michael H.5ORCID,Cazaux Stéphanie67,Fletcher Leigh N.8ORCID,de Kleer Katherine2ORCID,Lellouch Emmanuel3ORCID,Mura Alessandro9ORCID,Poch Olivier10ORCID,Quirico Eric10ORCID,Rodriguez-Ovalle Pablo3ORCID,Showalter Mark R.11ORCID,Tiscareno Matthew S.11ORCID,Tosi Federico9ORCID

Affiliation:

1. Cornell Center for Astrophysics and Planetary Science, Cornell University, Ithaca, NY 14853, USA.

2. Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA.

3. LESIA, Observatoire de Paris, Université PSL, Sorbonne Université, Université Paris Cité, CNRS, Meudon 92195, France.

4. Departments of Astronomy and of Earth and Planetary Science, University of California, Berkeley, CA 94720, USA.

5. Center for Integrative Planetary Science, University of California, Berkeley, CA 94720-3411, USA.

6. Faculty of Aerospace Engineering, Delft University of Technology, Delft, Netherlands.

7. Leiden Observatory, Leiden University, P.O. Box 9513, NL 2300 RA, Leiden, Netherlands.

8. School of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK.

9. Istituto Nazionale di AstroFisica–Istituto di Astrofisica e Planetologia Spaziali (INAF-IAPS), Rome, Italy.

10. Université Grenoble Alpes, Centre National de la Recherche Scientifique (CNRS), Institut de Planétologie et d’Astrophysique de Grenoble (IPAG), Grenoble 38000, France.

11. SETI Institute, Mountain View, CA 94043, USA.

Abstract

Ganymede is the only satellite in the solar system known to have an intrinsic magnetic field. Interactions between this field and the Jovian magnetosphere are expected to funnel most of the associated impinging charged particles, which radiolytically alter surface chemistry across the Jupiter system, to Ganymede’s polar regions. Using observations obtained with JWST as part of the Early Release Science program exploring the Jupiter system, we report the discovery of hydrogen peroxide, a radiolysis product of water ice, specifically constrained to the high latitudes. This detection directly implies radiolytic modification of the polar caps by precipitation of Jovian charged particles along partially open field lines within Ganymede’s magnetosphere. Stark contrasts between the spatial distribution of this polar hydrogen peroxide, those of Ganymede’s other radiolytic oxidants, and that of hydrogen peroxide on neighboring Europa have important implications for understanding water-ice radiolysis throughout the solar system.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference80 articles.

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5. M. A. McGrath E. Lellouch D. F. Strobel P. D. Feldman R. E. Johnson Satellite atmospheres in Jupiter: The Planet Satellites and Magnetosphere F. Bagenal T. Dowling and W. McKinnon Eds. (Cambridge Univ. Press 2004) pp. 457–483.

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