A Conversation with LNE

Erard, Luc

doi:10.1080/19315775.2010.11721523

Cited by 1 publication

(1 citation statement)

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“…Coradini et al 1976;Carusi & Massaro 1978;Bianchi et al 1980;Gavrishin et al 1980;Giovannelli et al 1981;Coradini, Giovannelli & Polimene 1983;Barucci et al 1987;Orosei et al 2003). In particular, the Imaging Spectrometer for Mars, flown on-board the Soviet Phobos mission, offered the first chance to apply the G-mode method to imaging spectroscopy data (Coradini et al 1991;Erard, Cerroni & Coradini 1992;Cerroni & Coradini 1995). More recently, the G-mode was applied also to Cassini/VIMS data acquired during the close flyby of Phoebe (Tosi et al 2005;Coradini et al 2008) and to the combined data of Titan returned by Cassini/VIMS and Cassini/RADAR (Tosi et al 2010).…”

Section: T H E G -M O D E M E T H O Dmentioning

confidence: 99%

Probing the origin of the dark material on Iapetus

Tosi¹,

Turrini²,

Coradini³

et al. 2010

Monthly Notices of the Royal Astronomical Society

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Among the icy satellites of Saturn, Iapetus shows a striking dichotomy between its leading and trailing hemispheres, the former being significantly darker than the latter. Thanks to the VIMS imaging spectrometer on-board Cassini, it is now possible to investigate the spectral features of the satellites in Saturn system within a wider spectral range and with an enhanced accuracy than with previously available data. In this work, we present an application of the G-mode method to the high resolution, visible and near infrared data of Phoebe, Iapetus and Hyperion collected by Cassini/VIMS, to search for compositional correlations. We also present the results of a dynamical study on the efficiency of Iapetus in capturing dust grains travelling inward in Saturn system to evaluate the viability of Poynting-Robertson drag as the physical mechanism transferring the dark material to the satellite. The results of spectroscopic classification are used jointly with the ones of the dynamical study to describe a plausible physical scenario for the origin of Iapetus' dichotomy. Our work shows that mass transfer from the outer Saturnian system is an efficient mechanism, particularly for the range of sizes hypothesised for the particles composing the newly discovered outer ring around Saturn. Both spectral and dynamical data indicate Phoebe as the main source of the dark material. However, we suggest a multi-source scenario where now extinct prograde satellites and the disruptive impacts that generated the putative collisional families played a significant role in supplying the original amount of dark material.Comment: 20 pages, 4 tables, 11 figures, major revision (manuscript extended and completed, figures added and corrected, new results added), minor revision and finalization of author list, moderate revision (update of the manuscript following reviewer's feedback and discovery of the new Saturnian outer ring

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