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Titan's equatorial belt: Surface composition and geomorphology from Cassini's VIMS and RADAR data

Brossier, Jérémy F. and Rodriguez, S. and Cornet, Thomas and Lucas, A. and Radebaugh, Jani and Maltagliati, L. and Le Mouelic, S. and Solomonidou, A. and Coustenis, A. and Hirtzig, M. and Jaumann, R. and Stephan, Katrin and Sotin, C. (2018) Titan's equatorial belt: Surface composition and geomorphology from Cassini's VIMS and RADAR data. 14th Japan Geosciences Union, 20-24 May 2018, Chiba, Japan.

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Abstract

In thirteen years, infrared observations from the Visual and Infrared Mapping Spectrometer (VIMS) onboard Cassini provided significant hints about the spectral and geological diversity of Titan’s surface. The analysis of the infrared signature of spectral units enables constraining the surface composition, which is essential to understand possible interactions between Titan’s interior, surface and atmosphere. Here, we investigate a selection of areas in Titan's low-latitudes imaged by Cassini's VIMS IR spectrometer, which exhibit an apparent transition from the VIMS IR-bright to the IR-blue and IR-brown spectral units (from false-color composites using red: 1.57/1.27 µm, green: 2.01/1.27 µm, and blue: 1.27/1.08 µm). By applying an updated radiative transfer model [1-3], we extract the surface albedo of IR-units identified in these regions. Then, we compare them with synthetic spectra of mixtures of the two most expected components of Titan’s surface, namely water ice and laboratory tholins. This allows us to reconnect the derived composition and grain size information to the geomorphology observed from Cassini's RADAR/SAR images. Hence, we interpret IR-bright terrains as hills and plains coated by organic material and incised by fluvial networks. The erosion products are transported downstream to areas where IR-blue terrains are seen near the IR-bright terrains. These areas, enriched in water ice, are most likely outwash plains hosting icy and organic debris from fluvial erosion. Farther away from the IR-bright terrains, the IR-brown terrains are dominantly made of organics with varied grain sizes ranging from dust- to sand-sized particles that form the dunes fields. In this work, we show that transition areas exhibit trends in terms of water ice content and grain size supported by geomorphological observations [4]. References: [1] Hirtzig, M. et al. (2013) Icarus, 226. [2] Solomonidou, A. et al. (2014) JGR, 119. [3] Maltagliati, L. et al. (2015) EPSC. [4] Brossier, J. F. et al. (2018) JGR.

Item URL in elib:https://elib.dlr.de/120191/
Document Type:Conference or Workshop Item (Speech)
Title:Titan's equatorial belt: Surface composition and geomorphology from Cassini's VIMS and RADAR data
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Brossier, Jérémy F.Jeremy.Brossier (at) dlr.dehttps://orcid.org/0000-0001-7423-2494
Rodriguez, S.IPGP Paris, FranceUNSPECIFIED
Cornet, ThomasLaboratoire AIM, Université Paris Diderot, ParisUNSPECIFIED
Lucas, A.IPGP Paris, FranceUNSPECIFIED
Radebaugh, JaniDepartment of Geological Sciences, Brigham Young University, Provo, Utah, USAUNSPECIFIED
Maltagliati, L.Nature Publishing Group London, UKUNSPECIFIED
Le Mouelic, S.Laboratoire de Planétologie et Géodynamique, 2 rue de la Houssinière, 44322 NantesUNSPECIFIED
Solomonidou, A.ESAC, Madrid, SpainUNSPECIFIED
Coustenis, A.Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique (LESIA), Observatoire de Paris-Meudon, 92195 Meudon Cedex, FranceUNSPECIFIED
Hirtzig, M.Fondation La Main a la Pate, FranceUNSPECIFIED
Jaumann, R.ralf.jaumann (at) dlr.deUNSPECIFIED
Stephan, KatrinKatrin.Stephan (at) dlr.deUNSPECIFIED
Sotin, C.Jet Propulsion Laboratory, Caltech, 4800 Oak Grove Drive, Pasadena, CA 91109, USAUNSPECIFIED
Date:May 2018
Refereed publication:No
Open Access:No
In DOAJ:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Radiative transfer code, Titan surface composition, Titan geology
Event Title:14th Japan Geosciences Union
Event Location:Chiba, Japan
Event Type:international Conference
Event Dates:20-24 May 2018
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 Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Brossier, Jérémy F.
Deposited On:10 Sep 2018 14:45
Last Modified:10 Sep 2018 14:45

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