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Catalogue POP – Notice individuelle de publication

Buratti B. J., Cruikshank Dale P., Brown Robert H., Clark Roger N., Bauer James M., Jaumann Ralf, McCord Thomas B., Simonelli D. P., Hibbitts C. A., Hansen Gary B., Owen Tobias C., Baines Kevin H., Bellucci Giancarlo, Bibring Jean-Pierre, Capaccioni Fabrizio, Cerroni Priscilla, Coradini Angioletta, Drossart Pierre, Formisano Vittorio, Langevin Yves, Matson Dennis L., Mennella Vito, Nelson Robert M., Nicholson Philip D., Sicardy Bruno, Sotin Christophe, Roush Ted L., Soderlund K., Muradyan A.

Cassini Visual and Infrared Mapping Spectrometer Observations of Iapetus: Detection of CO<SUB>2</SUB>

The Astrophysical Journal Letters, 2005, vol. 622, pp. L149-L152

Référence DOI : 10.1086/429800
Référence ADS : 2005ApJ...622L.149B

Résumé :

The Visual and Infrared Mapping Spectrometer (VIMS) instrument aboard the Cassini spacecraft obtained its first spectral map of the satellite Iapetus in which new absorption bands are seen in the spectra of both the low-albedo hemisphere and the H<SUB>2</SUB>O ice-rich hemisphere. Carbon dioxide is identified in the low-albedo material, probably as a photochemically produced molecule that is trapped in H<SUB>2</SUB>O ice or in some mineral or complex organic solid. Other absorption bands are unidentified. The spectrum of the low-albedo hemisphere is satisfactorily modeled with a combination of organic tholin, poly-HCN, and small amounts of H<SUB>2</SUB>O ice and Fe<SUB>2</SUB>O<SUB>3</SUB>. The high-albedo hemisphere is modeled with H<SUB>2</SUB>O ice slightly darkened with tholin. The detection of CO<SUB>2</SUB> in the low-albedo material on the leading hemisphere supports the contention that it is carbon-bearing material from an external source that has been swept up by the satellite's orbital motion.

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