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| Titel |
Detectability of fluorescence emission signatures from 67 P/Churyumov-Gerasimenko using VIRTIS-H aboard Rosetta |
| VerfasserIn |
Thérèse Encrenaz, Jacques Crovisier, Cedric Leyrat, Stephane Erard, Dominique Bockelee-Morvan, Vincent Debout, Pierre Drossart, Fabrizio Capaccioni |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250091939
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| Publikation (Nr.) |
 EGU/EGU2014-6258.pdf |
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| Zusammenfassung |
| We present a very simple model to obtain a first order estimate of the detectability of parent molecules from 67/P Churyumov-Gerasimenko, from their fluorescence signatures between 2 and 5 micrometres, using VIRTIS-H aboard Rosetta. For molecules other than H2O, CO and CO2, no complete calculation (including collisions and dust effects) has been published so far, so a first order analysis is pertinent. We consider the optically thin case, with solar fluorescence as the only emission mechanism. As a first approximation, the rotational populations in the fundamental vibration mode are assumed to follow a Boltzmann distribution at low temperature. Production rates of H2O, CO and CO2 are taken from the Rosetta Project Comet Reference Model (ESA, 30 March 2012). For other molecules, estimates are taken or extrapolated from Bockelee-Morvan et al, Comet II, 2005. Our results will be compared with the predictions for H2O, CO and CO2 obtained from more elaborated models (Debout et al. DPS#45, 413.02, 2013). At 3 AU, the first molecule expected to be detectable is CO2, followed by H2O. We will present detectability limits for several parent molecules (CO, OCS, CH4, CH3OH, H2CO, NH3, SO2 and H2S), at 3 AU and at perihelion. |
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