Origin of oxygen species in Titan's atmosphere

S. M. Hörst, Veronique Vuitton, R. V. Yelle

Research output: Contribution to journalArticlepeer-review

102 Scopus citations


The detection of O+ precipitating into Titan's atmosphere by the Cassini Plasma Spectrometer (CAPS) represents the discovery of a previously unknown source of oxygen in Titan's atmosphere. The photochemical model presented here shows that those oxygen ions are incorporated into CO and CO2. We show that the observed abundances of CO, CO2 and H2O can be simultaneously reproduced using an oxygen flux consistent with the CAPS observations and an OH flux consistent with predicted production from micrometeorite ablation. It is therefore unnecessary to assume that the observed CO abundance is the remnant of a larger primordial CO abundance or to invoke outgassing of CO from Titan's interior as a source of CO.

Original languageEnglish (US)
Article numberE10006
JournalJournal of Geophysical Research: Planets
Issue number10
StatePublished - Oct 20 2008

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science


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