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Saturn’s icy satellites and rings investigated by Cassini–VIMS: III – Radial compositional variability

Filacchione, G. and Capaccioni, F. and Ciarniello, M. and Clark, R.N. and Cuzzi, J.N. and Nicholson, P.D. and Cruikshank, D.P. and Hedman, M.M. and Buratti, B.J. and Lunine, J.I. and Soderblom, L.A. and Tosi, F. and Cerroni, P. and Brown, R.H. and McCord, T.B. and Jaumann, R. and Stephan, K. and Baines, K.H. and Flamini, E. (2012) Saturn’s icy satellites and rings investigated by Cassini–VIMS: III – Radial compositional variability. Icarus: International Journal of Solar System Studies, 220 (2), pp. 1064-1096. Elsevier. DOI: 10.1016/j.icarus.2012.06.040

Full text not available from this repository.

Official URL: http://www.sciencedirect.com/science/article/pii/S0019103512002692

Abstract

In the last few years Cassini–VIMS, the Visible and Infrared Mapping Spectrometer, returned to us a comprehensive view of the Saturn’s icy satellites and rings. After having analyzed the satellites’ spectral properties (Filacchione, G., Capaccioni, F., McCord, T.B., Coradini, A., Cerroni, P., Bellucci, G., Tosi, F., D’Aversa, E., Formisano, V., Brown, R.H., Baines, K.H., Bibring, J.P., Buratti, B.J., Clark, R.N., Combes, M., Cruikshank, D.P., Drossart, P., Jaumann, R., Langevin, Y., Matson, D.L., Mennella, V., Nelson, R.M., Nicholson, P.D., Sicardy, B., Sotin, C., Hansen, G., Hibbitts, K., Showalter, M., Newman, S. [2007]. Icarus 186, 259–290, paper I) and their distribution across the satellites’ hemispheres (Filacchione, G., Capaccioni, F., Clark, R.N., Cuzzi, J.N., Cruikshank, D.P., Coradini, A., Cerroni, P., Nicholson, P.D., McCord, T.B., Brown, R.H., Buratti, B.J., Tosi, F., Nelson, R.M., Jaumann, R., Stephan, K. [2010]. Icarus 206, 507–523, paper II), we proceed in this paper to investigate the radial variability of icy satellites (principal and minor) and main rings average spectral properties. This analysis is done by using 2264 disk-integrated observations of the satellites and a 12 × 700 pixels-wide rings radial mosaic acquired with a spatial resolution of about 125 km/pixel. Using different VIS and IR spectral indicators, e.g. spectral slopes and band depths, we perform a comparative analysis of these data aimed to measure the distribution of water ice and red contaminant materials across Saturn’s system. The average surface regolith grain sizes are estimated with different indicators through comparison with laboratory and synthetic spectra. These measurements highlight very striking differences in the population here analyzed, which vary from the almost uncontaminated and water ice-rich surfaces of Enceladus and Calypso to the metal/organic-rich and red surfaces of Iapetus’ leading hemisphere and Phoebe. Rings spectra appear more red than the icy satellites in the visible range but show more intense 1.5–2.0 μm band depths. Although their orbits are close to the F-ring, Prometheus and Pandora are different in surface composition: Prometheus in fact appears very water ice-rich but at the same time very red at VIS wavelengths. These properties make it very similar to A–B ring particles while Pandora is bluer. Moving outwards, we see the effects of E ring particles, generated by Enceladus plumes, which contaminate satellites surfaces from Mimas out to Rhea. We found some differences between Tethys lagrangian moons, Calypso being much more water ice-rich and bluer than Telesto. Among outer satellites (Hyperion, Iapetus and Phoebe) we observe a linear trend in both water ice decrease and in reddening, Hyperion being the reddest object of the population. The correlations among spectral slopes, band depths, visual albedo and phase permit us to cluster the saturnian population in different spectral classes which are detected not only among the principal satellites and rings but among co-orbital minor moons as well. These bodies are effectively the “connection” elements, both in term of composition and evolution, between the principal satellites and main rings. Finally, we have applied Hapke’s theory to retrieve the best spectral fits to Saturn’s inner regular satellites (from Mimas to Dione) using the same methodology applied previously for Rhea data discussed in Ciarniello et al. (Ciarniello, M., Capaccioni, F., Filacchione, G., Clark, R.N., Cruikshank, D.P., Cerroni, P., Coradini, A., Brown, R.H., Buratti, B.J., Tosi, F., Stephan, K. [2011]. Icarus 214, 541–555).

Item URL in elib:https://elib.dlr.de/80599/
Document Type:Article
Title:Saturn’s icy satellites and rings investigated by Cassini–VIMS: III – Radial compositional variability
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Filacchione, G.INAF–IAPS, Istituto di Astrofisica e Planetologia Spaziali, Area di Ricerca di Tor Vergata, via del Fosso del Cavaliere, 100, 00133 Rome, ItalyUNSPECIFIED
Capaccioni, F.INAF–IAPS, Istituto di Astrofisica e Planetologia Spaziali, Area di Ricerca di Tor Vergata, via del Fosso del Cavaliere, 100, 00133 Rome, ItalyUNSPECIFIED
Ciarniello, M.INAF–IAPS, Istituto di Astrofisica e Planetologia Spaziali, Area di Ricerca di Tor Vergata, via del Fosso del Cavaliere, 100, 00133 Rome, ItalyUNSPECIFIED
Clark, R.N.US Geological Survey, Federal Center, Denver, CO 80228, USAUNSPECIFIED
Cuzzi, J.N.NASA Ames Research Center, Moffett Field, CA 94035-1000, USAUNSPECIFIED
Nicholson, P.D.Cornell University, Astronomy Department, 418 Space Sciences Building, Ithaca, NY 14853, USAUNSPECIFIED
Cruikshank, D.P.NASA Ames Research Center, Moffett Field, CA 94035-1000, USAUNSPECIFIED
Hedman, M.M.Cornell University, Astronomy Department, 418 Space Sciences Building, Ithaca, NY 14853, USAUNSPECIFIED
Buratti, B.J.Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Groove Drive, Pasadena, CA 91109, USAUNSPECIFIED
Lunine, J.I.Cornell University, Astronomy Department, 418 Space Sciences Building, Ithaca, NY 14853, USAUNSPECIFIED
Soderblom, L.A.US Geological Survey, Flagstaff Station, 2255 N. Gemini Drive, Flagstaff, AZ 86001, USAUNSPECIFIED
Tosi, F.INAF–IAPS, Istituto di Astrofisica e Planetologia Spaziali, Area di Ricerca di Tor Vergata, via del Fosso del Cavaliere, 100, 00133 Rome, ItalyUNSPECIFIED
Cerroni, P.INAF–IAPS, Istituto di Astrofisica e Planetologia Spaziali, Area di Ricerca di Tor Vergata, via del Fosso del Cavaliere, 100, 00133 Rome, ItalyUNSPECIFIED
Brown, R.H.Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Groove Drive, Pasadena, CA 91109, USAUNSPECIFIED
McCord, T.B.Bear Fight Center, 22 Fiddlers Rd., Winthrop, WA 98862, USAUNSPECIFIED
Jaumann, R.ralf.jaumann (at) dlr.deUNSPECIFIED
Stephan, K.katrin.stephan (at) dlr.deUNSPECIFIED
Baines, K.H.Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Groove Drive, Pasadena, CA 91109, USAUNSPECIFIED
Flamini, E.ASI, Agenzia Spaziale Italiana, viale Liegi 26, 00198 Rome, Italy; Lunar and Planetary Laboratory and Steward Observatory, University of Arizona, Tucson, AZ 85721, USAUNSPECIFIED
Date: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:220
DOI :10.1016/j.icarus.2012.06.040
Page Range:pp. 1064-1096
Publisher:Elsevier
Status:Published
Keywords: Saturn, Satellites; Saturn, Rings; Spectroscopy; Ices
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
Institute of Planetary Research > Planetary Geology
Deposited By: Pieth, Susanne
Deposited On:14 Jan 2013 07:55
Last Modified:18 Jul 2014 00:20

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