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The surface composition of Iapetus: Mapping results from Cassini VIMS

Clark, R. N. and Cruikshank, D. P. and Jaumann, R. and Brown, Robert H. and Stephan, K. and Dalle Ore, C. and Eric Livo, K. and Pearson, N. and Curchin, J. and Hoefen, T.M. and Buratti, B.J. and Filacchione, G. and Baines, K. H. and Nicholson, P. D. (2012) The surface composition of Iapetus: Mapping results from Cassini VIMS. Icarus: International Journal of Solar System Studies, 218 (2), pp. 831-860. Elsevier. DOI: 10.1016/j.icarus.2012.01.008

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Abstract

Cassini VIMS has obtained spatially resolved imaging spectroscopy data on numerous satellites of Saturn. A very close fly-by of Iapetus on September 10, 2007 provided the best data on the spectral signature and spatial extent of dark material on Iapetus. This Cassini Rev 49 Iapetus fly-by provided spatially resolved imaging spectroscopy data of the dark material and the leading/trailing side transition from the dark material to visually bright ice on the trailing side. Compositional mapping and radiative transfer modeling shows that the dark material is composed of metallic iron, nano-size iron oxide (hematite), CO2, H2O ice, and possible signatures of ammonia, bound water, H2 or OH-bearing minerals, trace organics, and as yet unidentified materials. CO2 indicates a pattern of increasing CO2 strength from the leading side apex to the transition zone to the icy trailing side. A Rayleigh scattering peak in the visible part of the spectrum indicates the dark material has a large component of fine, sub-0.5-μm diameter particles consistent with nanophase hematite and nanophase iron. Spectral signatures of ice also indicate that sub-0.5-μm diameter particles are present in the icy regions. Multiple lines of evidence point to an external origin for the dark material on Iapetus, including the global spatial pattern of dark material, local patterns including crater and cliff walls shielding implantation on slopes facing away from the leading side, exposing clean ice, and slopes facing the leading direction which show higher abundances of dark material. Multiple spectral features and overall spectral shape of the dark material on Iapetus match those seen on Phoebe, Hyperion, Dione, Epimetheus, Saturn's rings Cassini Division, and the F-ring implying the material has a common composition throughout the Saturn system. The dark material appears to have significant components of nanophase metallic iron and nanophase hematite contributing to the observed UV absorption. The blue scattering peak with a strong UV-visible absorption is observed in spectra of all satellites that contain dark material, again pointing to a common origin of contamination by metallic iron that is partially oxidized.

Item URL in elib:https://elib.dlr.de/80532/
Document Type:Article
Title:The surface composition of Iapetus: Mapping results from Cassini VIMS
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Clark, R. N.US Geological Survey, Denver, CO, USAUNSPECIFIED
Cruikshank, D. P.NASA Ames Research Center, Moffett Field, CA, USAUNSPECIFIED
Jaumann, R. ralf.jaumann (at) dlr.deUNSPECIFIED
Brown, Robert H.Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USAUNSPECIFIED
Stephan, K. katrin.stephan (at) dlr.deUNSPECIFIED
Dalle Ore, C.NASA AmesUNSPECIFIED
Eric Livo, K.US Geological Survey, Mail Stop 964, Box 25046, Denver Federal Center, Denver, CO 80225, USA), AH(US Geological Survey, Mail Stop 964, Box 25046, Denver Federal Center, Denver, CO 80225, USAUNSPECIFIED
Pearson, N.US Geological SurveyUNSPECIFIED
Curchin, J.US Geological SurveyUNSPECIFIED
Hoefen, T.M.US Geological Survey, Denver, CO, USAUNSPECIFIED
Buratti, B.J.Jet Propulsion Laboratory, Pasadena, CAUNSPECIFIED
Filacchione, G.INAF-IASF, Rome, ItalyUNSPECIFIED
Baines, K. H.Jet Propulsion Laboratory, Pasadena, CA, USAUNSPECIFIED
Nicholson, P. D.Department of Astronomy, Cornell University, Ithaca, NY, USAUNSPECIFIED
Date:April 2012
Journal or Publication Title:Icarus: International Journal of Solar System Studies
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:218
DOI :10.1016/j.icarus.2012.01.008
Page Range:pp. 831-860
Publisher:Elsevier
Status:Published
Keywords:Iapetus, Cassini VIMS
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben CASSINI (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Aydin, Zeynep
Deposited On:11 Jan 2013 12:51
Last Modified:20 Mar 2013 19:46

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