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Conference papers
The spectral nature of Titan's major geomorphological surface units: constraints on the composition
Anezina Solomonidou
1, 2
Athena Coustenis
3
Rosaly Lopes
2
Michael Malaska
2
Sébastien Rodriguez
4
Pierre Drossart
3
Charles Elachi
2
Bernard Schmitt
5
Alice Le Gall
6
Stephen Wall
2
Kenneth Lawrence
2
Nico Altobelli
1
Olivier Witasse
7
Jani Radebaugh
8
Ashley Shoenfeld
9
Anezina Solomonidou 1, 2
Author
Athena Coustenis 3
Author IdHAL : athena-coustenis ORCID : https://orcid.org/0000-0003-3414-3491
Rosaly Lopes 2
Author
Michael Malaska 2
Author
Sébastien Rodriguez 4
Author
Pierre Drossart 3
Author IdHAL : pierre-drossart ORCID : https://orcid.org/0000-0001-7261-0228
Charles Elachi 2
Author
Bernard Schmitt 5
Author IdHAL : bernard-schmitt ResearcherId : http://www.researcherid.com/rid/A-1064-2009
Alice Le Gall 6
Author IdHAL : alicelegall ORCID : https://orcid.org/0000-0002-9023-4868
Stephen Wall 2
Author
Kenneth Lawrence 2
Author
Nico Altobelli 1
Author
1
ESAC - European Space Astronomy Centre (Camino bajo del Castillo, s/n, Urbanización Villafranca del Castillo,, Villanueva de la Cañada, E-28692 Madrid
- Spain)
- ESA - European Space Agency (France)
2
JPL - Jet Propulsion Laboratory (4800 Oak Grove Drive, Pasadena, CA 91109-8099, USA - United States)
- NASA (www.nasa.gov - United States)
- CALTECH - California Institute of Technology (1200 East California Blvd, Pasadena, California 91125 - United States)
3
LESIA (UMR_8109) - Laboratoire d'études spatiales et d'instrumentation en astrophysique (5, place Jules Janssen 92190 MEUDON - France)
- INSU - CNRS - Institut national des sciences de l'Univers (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
- Observatoire de Paris (61 Av de l'Observatoire 75014 PARIS - France)
- PSL - Université Paris sciences et lettres (60 rue Mazarine 75006 Paris - France)
- UPD7 - Université Paris Diderot - Paris 7 : UMR_8109 (5 rue Thomas-Mann - 75205 Paris cedex 13 - France)
- SU - Sorbonne Université (21 rue de l’École de médecine - 75006 Paris - France)
- CNRS - Centre National de la Recherche Scientifique : UMR8109 (France)
4
AIM (UMR_7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation (AIM - UMR 7158 - UMR E 9005,
ex "Astrophysique Interactions Multi-échelles",
Service d'astrophysique,
CEA/Saclay,
Orme des Merisiers
F-91191 GIF SUR YVETTE CEDEX - France)
- CNRS - Centre National de la Recherche Scientifique : UMR_7158 (France)
- INSU - CNRS - Institut national des sciences de l'Univers (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
- CEA - Commissariat à l'énergie atomique et aux énergies alternatives : UMR_E_9005 (Centre de Saclay Centre de Grenoble Centre de Cadarache etc - France)
- UPD7 - Université Paris Diderot - Paris 7 : UMR_7158 (5 rue Thomas-Mann - 75205 Paris cedex 13 - France)
5
IPAG - Institut de Planétologie et d'Astrophysique de Grenoble (414, Rue de la Piscine BP 53 38041 Grenoble Cedex 9 - France)
- INSU - CNRS - Institut national des sciences de l'Univers (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
- CNES - Centre National d'Études Spatiales [Toulouse] (18 avenue Edouard Belin 31401 Toulouse - France)
- CNRS - Centre National de la Recherche Scientifique (France)
- OSUG - Observatoire des Sciences de l'Univers de Grenoble (414 Rue de la piscine - BP 53 38041 GRENOBLE CEDEX 9 - France)
- Grenoble INP - Institut polytechnique de Grenoble - Grenoble Institute of Technology (46 avenue Félix Viallet 38031 Grenoble Cedex 1 - France)
- INSU - CNRS - Institut national des sciences de l'Univers (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
- IRSTEA - Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (France)
- USMB [Université de Savoie] [Université de Chambéry] - Université Savoie Mont Blanc (27, rue Marcoz - 73000 Chambéry - France)
- CNRS - Centre National de la Recherche Scientifique : UMS832 (France)
- UGA [2016-2019] - Université Grenoble Alpes [2016-2019] (CS 40700 - 38058 Grenoble cedex - France)
6
IMPEC - LATMOS (France)
- LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales (11 boulevard d'Alembert
Quartier des Garennes
78280 - Guyancourt - France)
- SU - Sorbonne Université : UMR8190 (21 rue de l’École de médecine - 75006 Paris - France)
- UVSQ - Université de Versailles Saint-Quentin-en-Yvelines : UMR8190 (55 avenue de Paris - 78035 Versailles cedex - France)
- CNRS - Centre National de la Recherche Scientifique : UMR8190 (France)
- INSU - CNRS - Institut national des sciences de l'Univers : UMR8190 (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
7
RSSD - Research and Scientific Support Department, ESTEC (ESTEC, Box 299, NL-2200 AG , Noordwijk, The Netherlands - Netherlands)
- ESTEC - European Space Research and Technology Centre (Keplerlaan 1, 2201 Noordwijk - Netherlands)
- ESA - European Space Agency (France)
8
Department of Geological Sciences [BYU] (Provo, Utah 84602 - United States)
- BYU - Brigham Young University (Provo, Utah 84602 - United States)
9
EPSS - Department of Earth, Planetary and Space Sciences [Los Angeles] (Los Angeles, CA 90095-1567 - United States)
- UCLA - University of California [Los Angeles] ( Los Angeles, Californie 90095 - United States)
- University of California (United States)
Abstract : We investigate Titan's low-latitude and midlatitude surface using spectro-imaging near-infrared data from Cassini/Visual and Infrared Mapping Spectrometer. We use a radiative transfer code to first evaluate atmospheric contributions and then extract the haze and the surface albedo values of major geomorphological units identified in Cassini Synthetic Aperture Radar data, which exhibit quite similar spectral response to the Visual and Infrared Mapping Spectrometer data. We have identified three main categories of albedo values and spectral shapes, indicating significant differences in the composition among the various areas. We compare with linear mixtures of three components (water ice, tholin-like, and a dark material) at different grain sizes. Our fits of the data are overall successful, except in some cases at 0.94, 2.03, and 2.79 μm, indicative of the limitations of our simplistic compositional model and the need for additional components to reproduce Titan's complex surface. Our results show a latitudinal dependence of Titan's surface composition, with water ice being the major constituent at latitudes beyond 30°N and 30°S, while Titan's equatorial region appears to be dominated partly by a tholin-like or by a very dark unknown material. The albedo differences and similarities among the various geomorphological units give insights on the geological processes affecting Titan's surface and, by implication, its interior. We discuss our results in terms of origin and evolution theories.
Document type :
Conference papers
Domain :
Complete list of metadatas
https://hal.archives-ouvertes.fr/hal-02358242
Contributor : Athena Coustenis <>
Submitted on : Wednesday, November 13, 2019 - 6:37:56 PM
Last modification on : Monday, January 4, 2021 - 3:58:31 PM
Contributor : Athena Coustenis <>
Submitted on : Wednesday, November 13, 2019 - 6:37:56 PM
Last modification on : Monday, January 4, 2021 - 3:58:31 PM
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EPSC2018-167.pdf
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Identifiers
- HAL Id : hal-02358242, version 1
- BIBCODE : 2018EPSC...12..167S
Collections
OBSPM | SU-SCIENCES | DSM-IRFU | IRFU-AIM | UVSQ | USPC | SORBONNE-UNIVERSITE | LATMOS | LESIA | CEA | INSU | UNIV-PARIS7 | UNIV-SAVOIE | CNRS | IRSTEA | CEA-DRF | INRAE | UNIV-PARIS | UP-SCIENCES | PSL | UGA | IPAG | SU-TI
Citation
Anezina Solomonidou, Athena Coustenis, Rosaly Lopes, Michael Malaska, Sébastien Rodriguez, et al.. The spectral nature of Titan's major geomorphological surface units: constraints on the composition. European Planetary Science Congress 2018, Sep 2018, Berlin, Germany. ⟨hal-02358242⟩
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