Lorenz et al. 2008
Lorenz, R.D., B.W. Stiles, R.L. Kirk, M.D. Allison, P. Persi del Marmo, L. Iess, J.I. Lunine, S.J. Ostro, and S. Hensley, 2008: Titan's rotation reveals an internal ocean and changing zonal winds. Science, 319, 1649-1651, doi:10.1126/science.1151639.
Cassini radar observations of Saturn's moon Titan over several years show that its rotational period is changing and is different from its orbital period. The present-day rotation period difference from synchronous spin leads to a shift of ~0.36° per year in apparent longitude and is consistent with seasonal exchange of angular momentum between the surface and Titan's dense superrotating atmosphere, but only if Titan's crust is decoupled from the core by an internal water ocean like that on Europa.
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Lorenz, R.D., Stiles, B.W., Kirk, R.L., Allison, M.D., Persi del Marmo, P., Iess, L., Lunine, J.I., Ostro, S.J., and Hensley, S.: Titan's rotation reveals an internal ocean and changing zonal winds, Science, 319, 1649-1651, doi:10.1126/science.1151639, 2008.
Lorenz, R.D., B.W. Stiles, R.L. Kirk, M.D. Allison, P. Persi del Marmo, L. Iess, J.I. Lunine, S.J. Ostro, and S. Hensley (2008), Titan's rotation reveals an internal ocean and changing zonal winds, Science, 319, 1649-1651, doi:10.1126/science.1151639.
Lorenz, R.D., B.W. Stiles, R.L. Kirk, M.D. Allison, P. Persi del Marmo, L. Iess, J.I. Lunine, S.J. Ostro, and S. Hensley, 2008: Titan's rotation reveals an internal ocean and changing zonal winds. Science, 319, 1649-1651, doi:10.1126/science.1151639.
Lorenz, R.D., et al. 2008, Science, 319, 1649, doi:10.1126/science.1151639.
Lorenz RD, Stiles BW, Kirk RL, Allison MD, Persi del Marmo P, Iess L, Lunine JI, Ostro SJ, Hensley S. Titan's rotation reveals an internal ocean and changing zonal winds, Science 2008;319:1649-1651. doi:10.1126/science.1151639.
R.D. Lorenz, B.W. Stiles, R.L. Kirk, M.D. Allison, P. Persi del Marmo, L. Iess, J.I. Lunine, S.J. Ostro, S. Hensley, Science 319, 1649-1651, doi:10.1126/science.1151639 (2008).
