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

Jason W. Barnes, Robert H. Brown, Jason M. Soderblom, Laurence A. Soderblom, Ralf Jaumann, Brian Jackson, Stéphane Le Mouélic, Christophe Sotin, Bonnie J. Buratti, Karly M. Pitman, Kevin H. Baines, Roger N. Clark, Phillip D. Nicholson, Elizabeth P. Turtle, Jason Perry

Research output: Contribution to journalArticle

55 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)217-225
Number of pages9
JournalIcarus
Volume201
Issue number1
DOIs
StatePublished - May 2009

Fingerprint

coastal landform
Ontario
shorelines
Titan
lakes
lake
annuli
lake level
Lake Ontario
liquid sloshing
atmospheric correction
condensate
albedo
near infrared
spatial resolution
spectrometer
condensates
margins
methane
sediments

Keywords

  • Titan

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Barnes, J. W., Brown, R. H., Soderblom, J. M., Soderblom, L. A., Jaumann, R., Jackson, B., ... Perry, J. (2009). Shoreline features of Titan's Ontario Lacus from Cassini/VIMS observations. Icarus, 201(1), 217-225. https://doi.org/10.1016/j.icarus.2008.12.028

Shoreline features of Titan's Ontario Lacus from Cassini/VIMS observations. / Barnes, Jason W.; Brown, Robert H.; Soderblom, Jason M.; Soderblom, Laurence A.; Jaumann, Ralf; Jackson, Brian; Le Mouélic, Stéphane; Sotin, Christophe; Buratti, Bonnie J.; Pitman, Karly M.; Baines, Kevin H.; Clark, Roger N.; Nicholson, Phillip D.; Turtle, Elizabeth P.; Perry, Jason.

In: Icarus, Vol. 201, No. 1, 05.2009, p. 217-225.

Research output: Contribution to journalArticle

Barnes, JW, Brown, RH, Soderblom, JM, Soderblom, LA, Jaumann, R, Jackson, B, Le Mouélic, S, Sotin, C, Buratti, BJ, Pitman, KM, Baines, KH, Clark, RN, Nicholson, PD, Turtle, EP & Perry, J 2009, 'Shoreline features of Titan's Ontario Lacus from Cassini/VIMS observations', Icarus, vol. 201, no. 1, pp. 217-225. https://doi.org/10.1016/j.icarus.2008.12.028
Barnes JW, Brown RH, Soderblom JM, Soderblom LA, Jaumann R, Jackson B et al. Shoreline features of Titan's Ontario Lacus from Cassini/VIMS observations. Icarus. 2009 May;201(1):217-225. https://doi.org/10.1016/j.icarus.2008.12.028
Barnes, Jason W. ; Brown, Robert H. ; Soderblom, Jason M. ; Soderblom, Laurence A. ; Jaumann, Ralf ; Jackson, Brian ; Le Mouélic, Stéphane ; Sotin, Christophe ; Buratti, Bonnie J. ; Pitman, Karly M. ; Baines, Kevin H. ; Clark, Roger N. ; Nicholson, Phillip D. ; Turtle, Elizabeth P. ; Perry, Jason. / Shoreline features of Titan's Ontario Lacus from Cassini/VIMS observations. In: Icarus. 2009 ; Vol. 201, No. 1. pp. 217-225.
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