Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-07-30
Astrophys.J.692:168-173,2009
Astronomy and Astrophysics
Astrophysics
6 pages, 4 figures, published in ApJ
Scientific paper
10.1088/0004-637X/692/1/168
A large drift in the rotation rate of Titan observed by Cassini provided the first evidence of a subsurface ocean isolating the massive core from the icy crust. Seasonal exchange of angular momentum between the surface and atmosphere accounts for the magnitude of the effect, but observations lag the expected signal by a few years. We argue that this time lag is due to the presence of an active methane weather cycle in the atmosphere. An analytic model of the seasonal cycle of atmospheric angular momentum is developed and compared with time-dependent simulations of Titan's atmosphere with and without methane thermodynamics. The disappearance of clouds at the summer pole suggests the drift rate has already switched direction, signaling the change in season from solstice to equinox.
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