Photochemistry of O(1D) and O(1S) lines in the coma of 67P/Churyumov-Gerasimenko - Archive ouverte HAL Access content directly
Conference Papers Year : 2016

Photochemistry of O(1D) and O(1S) lines in the coma of 67P/Churyumov-Gerasimenko

, , , , , , , , , , , (1) , , , , , , , ,
1
Gaël Cessateur
  • Function : Author
Johan de Keyser
  • Function : Author
Romain Maggiolo
  • Function : Author
Andrew Gibbons
  • Function : Author
Guillaume Gronoff
  • Function : Author
Herbert Gunell
  • Function : Author
Frederik Dhooghe
  • Function : Author
Jérôme Loreau
Nathalie Vaeck
  • Function : Author
Kathrin Altwegg
  • Function : Author
Andre Bieler
  • Function : Author
Ursina Calmonte
  • Function : Author
Michael Combi
  • Function : Author
Stephen Fuselier
  • Function : Author
Tamas Gombosi
  • Function : Author
Myrtha Haessig
  • Function : Author
Lena Le Roy
  • Function : Author
Eddy Neefs
  • Function : Author
Martin Rubin
  • Function : Author

Abstract

We present here a chemistry-emission coupled model to study the production and loss mechanisms of the O(1D) and O(1S) states, for comet 67P/Churyumov-Gerasimenko. The recent discovery of O2 in significant abundance relative to water (3.80% +/- 0.85%, Bieler et al. 2015) within the coma of 67P has been taken into consideration for the first time in such models. We evaluate the effect of the presence of O2 on the green to red-doublet emission intensity ratio, which is traditionally used to assess the CO2 abundance within cometary atmospheres. Model simulations, solving the continuity equation with transport, show that not taking O2 into account leads to an underestimation of the CO2 abundance within 67P. This strongly suggests that the green to red-doublet emission intensity ratio alone is not a proper tool for determining the CO2 abundance, as previously suggested. O2 might indeed be a rather common and abundant parent species, following the re-analysis of the comet 1P/Halley data (Rubin et al. 2015). Therefore, it is likely that earlier determinations of the CO2 abundance in cometary atmospheres have to be revisited.
Fichier principal
Vignette du fichier
EGU2016-13043.pdf (44.66 Ko) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03573511 , version 1 (15-02-2022)

Licence

Attribution - CC BY 4.0

Identifiers

Cite

Gaël Cessateur, Johan de Keyser, Romain Maggiolo, Andrew Gibbons, Guillaume Gronoff, et al.. Photochemistry of O(1D) and O(1S) lines in the coma of 67P/Churyumov-Gerasimenko. EGU General Assembly 2016, Apr 2016, Vienne, Austria. ⟨insu-03573511⟩
23 View
1 Download

Share

Gmail Facebook Twitter LinkedIn More