The Contribution of Electrons to the Sputter-produced O2Exosphere on Europa

M. R. Davis, R. M. Meier, J. F. Cooper, M. J. Loeffler

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Electrons contribute a strong radiation component to the surface bombardment of Europa. However, they are not typically considered to contribute to erosion of the surface H2O-ice or produce exospheres of radiolytic O2, as laboratory studies on sputtering induced by electrons are sparse. Here we have measured the sputtering yield of H2O-ice induced by 0.5 keV electrons between 14 and 125 K, estimating the composition of the stable products ejected during irradiation. Combining these measurements with updated electron flux measurements, we estimate for the first time that the global surface production rate of O2 from electron-induced sputtering is larger than the production rate previously estimated for all of the ionic components combined. Our results emphasize the importance of electrons in producing exospheres on icy satellites and suggest that these exospheres need not be tied to environments where the surface is being bombarded with heavy ions.

Original languageEnglish (US)
Article numberL53
JournalAstrophysical Journal Letters
Volume908
Issue number2
DOIs
StatePublished - Feb 20 2021

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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