Concerning thermal tides on hot Jupiters

Details Concerning thermal tides on hot Jupiters Concerning thermal tides on hot Jupiters

2009-01-21

arxiv.org/abs/0901.3279v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

Research note, not for publication. 2 pages, 1 figure

Scientific paper

By analogy with a mechanism proposed by Gold and Soter to explain the retrograde rotation of Venus, Arras and Socrates suggest that thermal tides may excite hot jovian exoplanets into nonsynchronous rotation, and perhaps also noncircular orbits. It is shown here that because of the absence of a solid surface above the convective core of a jovian planet, the coupling of the gravitational and thermal tides vanishes to zeroth order in the ratio of the atmospheric scale height to the planetary radius. At the next order, the effect probably has the sign opposite to that claimed by the latter authors, hence reinforcing synchronous and circular orbits.

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