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The Tides of Titan

Iess, Luciano and Jacobson, Robert A. and Ducci, Marco and Stevenson, David J. and Lunine, Jonathan I. and Armstrong, John W. and Asmar, Sami W. and Racioppa, Paolo and Rappaport, Nicole J. and Tortora, Paolo (2012) The Tides of Titan. Science, 337 (6093). pp. 457-459. ISSN 0036-8075. https://resolver.caltech.edu/CaltechAUTHORS:20120813-090552775

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Abstract

We have detected in Cassini spacecraft data the signature of the periodic tidal stresses within Titan, driven by the eccentricity (e = 0.028) of its 16-day orbit around Saturn. Precise measurements of the acceleration of Cassini during six close flybys between 2006 and 2011 have revealed that Titan responds to the variable tidal field exerted by Saturn with periodic changes of its quadrupole gravity, at about 4% of the static value. Two independent determinations of the corresponding degree-2 Love number yield k_2 = 0.589 ± 0.150 and k2 = 0.637 ± 0.224 (2σ). Such a large response to the tidal field requires that Titan’s interior be deformable over time scales of the orbital period, in a way that is consistent with a global ocean at depth.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1126/science.1219631DOIArticle
http://www.sciencemag.org/content/337/6093/457.abstractPublisherArticle
http://www.sciencemag.org/content/337/6093/457/suppl/DC1PublisherSupplementary Material
ORCID:
AuthorORCID
Stevenson, David J.0000-0001-9432-7159
Additional Information:© 2012 American Association for the Advancement of Science. Received for publication 25 January 2012. Accepted for publication 6 June 2012. Published online 28 June 2012. L.I., M.D., P.R., and P.T. acknowledge support from the Italian Space Agency. The work of R.A.J., J.W.A., S.W.A., and N.J.R. was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. The Doppler data used in this analysis are archived in NASA’s Planetary Data System.
Funders:
Funding AgencyGrant Number
Agenzia Spaziale Italiana (ASI)UNSPECIFIED
NASA/JPL/CaltechUNSPECIFIED
Issue or Number:6093
Record Number:CaltechAUTHORS:20120813-090552775
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20120813-090552775
Official Citation:The Tides of Titan Luciano Iess, Robert A. Jacobson, Marco Ducci, David J. Stevenson, Jonathan I. Lunine, John W. Armstrong, Sami W. Asmar, Paolo Racioppa, Nicole J. Rappaport, and Paolo Tortora Science 27 July 2012: 457-459. [DOI:10.1126/science.1219631]
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33113
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:13 Aug 2012 16:33
Last Modified:03 Oct 2019 04:07

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