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Shoreline features of Titan's Ontario Lacus from Cassini/VIMS observations

Barnes, Jason W. and Brown, Robert H. and Soderblom, Jason M. and Soderblom, Laurence A. and Jaumann, Ralf and Jackson, Brian and Le Mouélic, Stéphane and Sotin, Christophe and Buratti, Bonnie J. and Pitman, Karly M and Baines, Kevin H. and Clark, Roger N. and Nicholson, Phillip D. and Turtle, Elizabeth P. and Perry, Jason (2009) Shoreline features of Titan's Ontario Lacus from Cassini/VIMS observations. Icarus: International Journal of Solar System Studies, 201 (1), pp. 217-225. Elsevier. DOI: 10.1016/j.icarus.2008.12.028

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Abstract

We analyze observations of Titan's south polar lake Ontario Lacus obtained by Cassini's Visual and Infrared Mapping Spectrometer during the 38th flyby of Titan (T38; 2007 December 5). These near-closest-approach observations have the highest signal-to-noise, the finest spatial resolution, and the least atmospheric influence of any near-infrared lake observation to date. We use the large, spatially flat, and low-albedo interior of Ontario Lacus as a calibration target allowing us to derive an analytical atmospheric correction for emission angle. The dark lake interior is surrounded by two separate annuli that follow the lake interior's contours. The inner annulus is uniformly dark, but not so much as the interior lake, and is generally 5–10 kilometers wide at the lake's southeastern margin. We propose that it represents wet lakebed sediments exposed by either tidal sloshing of the lake or seasonal methane loss leading to lower lake-volume. The exterior annulus is bright and shows a spectrum consistent with a relatively low water-ice content relative to the rest of Titan. It may represent fine-grained condensate deposits from a past era of higher lake level. Together, the annuli seem to indicate that the lake level for Ontario Lacus has changed over time. This hypothesis can be tested with observations scheduled for future Titan flybys.

Item URL in elib:https://elib.dlr.de/61549/
Document Type:Article
Title:Shoreline features of Titan's Ontario Lacus from Cassini/VIMS observations
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Barnes, Jason W.NASA Ames Research Center, Mail Stop 244-30, Moffett Field, CA 94035, USA; Department of Physics, University of Idaho, Engineering-Physics Building, Moscow, ID 83844, USAUNSPECIFIED
Brown, Robert H.Department of Planetary Sciences, University of Arizona, Tucson, AZ 85721, USAUNSPECIFIED
Soderblom, Jason M.Department of Planetary Sciences, University of Arizona, Tucson, AZ 85721, USAUNSPECIFIED
Soderblom, Laurence A.United States Geological Survey, Flagstaff, AZ 86001, USAUNSPECIFIED
Jaumann, RalfUNSPECIFIEDUNSPECIFIED
Jackson, BrianDepartment of Planetary Sciences, University of Arizona, Tucson, AZ 85721, USAUNSPECIFIED
Le Mouélic, StéphaneLaboratoire de Planétologie et Géodynamique, CNRS UMR6112, Université de Nantes, FranceUNSPECIFIED
Sotin, ChristopheJet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USAUNSPECIFIED
Buratti, Bonnie J.Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USAUNSPECIFIED
Pitman, Karly MJet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USAUNSPECIFIED
Baines, Kevin H.Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USAUNSPECIFIED
Clark, Roger N.United States Geological Survey, Denver, CO 80225, USAUNSPECIFIED
Nicholson, Phillip D.Department of Astronomy, Cornell University, Ithaca, NY 14853, USAUNSPECIFIED
Turtle, Elizabeth P.Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723, USAUNSPECIFIED
Perry, JasonDepartment of Planetary Sciences, University of Arizona, Tucson, AZ 85721, USAUNSPECIFIED
Date:2009
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:201
DOI :10.1016/j.icarus.2008.12.028
Page Range:pp. 217-225
Publisher:Elsevier
Status:Published
Keywords:Titan
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben CASSINI (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Deposited By: Pieth, Susanne
Deposited On:09 Dec 2009 09:47
Last Modified:26 Mar 2013 13:14

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