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Dynamic molecular oxygen production in cometary comae.

Yunxi Yao1, Konstantinos P Giapis1

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.

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Molecular oxygen (O2) on comet 67P/Churyumov-Gerasimenko has a new origin. An Eley-Rideal reaction between water ions and the comet's surface produces O2, linking it to water and solar wind interactions.

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Area of Science:

  • Planetary Science
  • Cometary Science
  • Astrochemistry

Background:

  • Abundant molecular oxygen (O2) detected in comet 67P/Churyumov-Gerasimenko's coma.
  • Previous hypotheses attributed O2 origin to primordial incorporation during nucleus formation.
  • Several abiotic O2 production mechanisms were previously discounted.

Purpose of the Study:

  • To investigate a novel mechanism for O2 production in cometary comas.
  • To explain the presence of O2 on comet 67P/Churyumov-Gerasimenko.
  • To explore the role of energetic ions in cometary chemistry.

Main Methods:

  • Proposed an Eley-Rideal reaction mechanism for direct O2 formation.
  • Simulated collisions between energetic water ions (H2O+) and oxidized cometary surface analogues.
  • Investigated the reaction pathway involving surface oxygen atom abstraction and subsequent dissociation.

Main Results:

  • Demonstrated direct O2 formation via a single-collision Eley-Rideal reaction.
  • Identified a pathway producing O2- (negatively charged molecular oxygen ion) via H2O+ interaction with surface oxygen.
  • Showed subsequent photo-detachment yields molecular O2.

Conclusions:

  • The Eley-Rideal mechanism provides a viable abiotic route for O2 production in comets.
  • Cometary O2 presence can be directly linked to water molecules and solar wind interactions.
  • Energetic negative ions play a significant role in cometary environments.