Isotopic ratios in titan's atmosphere from cassini cirs limb sounding: HC3N in the north

Autor: Bruno Bézard, Sandrine Vinatier, A. Coustenis, D. E. Jennings, F. M. Flasar, Paul N. Romani, Pgj Irwin, Antoine Jolly, Nicholas A Teanby, Richard K. Achterberg, Conor A. Nixon
Přispěvatelé: NASA/Goddard Space Flight Center (NASA/GSFC), Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Atmospheric, Oceanic and Planetary Physics, Department of Physics, Clarendon Laboratory, University of Oxford
Jazyk: angličtina
Rok vydání: 2016
Předmět:
Zdroj: The Astrophysical journal letters
The Astrophysical journal letters, 2008, 681, pp.L109-L111. ⟨10.1086/590534⟩
The Astrophysical journal letters, Bristol : IOP Publishing, 2008, 681, pp.L109-L111. ⟨10.1086/590534⟩
ISSN: 2041-8205
2041-8213
DOI: 10.1086/590534⟩
Popis: International audience; This Letter reports the first detection of the three 13C isotopologues of HC3N on Titan, from Cassini Composite Infrared Spectrometer (CIRS) infrared spectra. The data are limb spectra taken at latitudes N54°-N69° in 2006 and 2007 when HC3N was enhanced in the north. Using a new line list for the nu5 bands of all isotopologues, we have modeled the isolated emission of H13CCCN at 658.7 cm-1 and both HC13CCN and HCC13CN at 663.0 cm-1, which are blended with the Q-branch of HC3N at 663.3 cm-1 at the resolution of CIRS (0.5 cm-1) and detectable as an increase in the intensity of the low-frequency wing. Using the resolved pair H13CCCN /HC3N we find 12C/13C=79+/-17, in line with other measurements on Titan from Cassini and Huygens.
Databáze: OpenAIRE
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