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| Titel |
Photochemistry of O(1D) and O(1S) lines in the coma of 67P/Churyumov-Gerasimenko |
| VerfasserIn |
Gaël Cessateur, Johan De Keyser, Romain Maggiolo, Andrew Gibbons, Guillaume Gronoff, Herbert Gunell, Frederik Dhooghe, Jérôme Loreau, Nathalie Vaeck, Kathrin Altwegg  , André Bieler, Christelle Briois, Ursina Calmonte, Michael Combi, Stephen Fuselier, Tamas Gombosi, Myrtha Haessig, Léna Le Roy, Eddy Neefs, Martin Rubin |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250132526
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| Publikation (Nr.) |
 EGU/EGU2016-13043.pdf |
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| Zusammenfassung |
| 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. |
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