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Via the Rossiter-McLaughlin effect, it is possible to measure thesky-projected angle between the stellar spin and a planet's orbital spin.Observed orbital inclinations have been found to range over all possibleangles. A tentative detection of a correlation between the dispersion inspin/orbit angle and the youth of the system is revealed, using spin/orbitmeasurements for hot Jupiters around stars with masses larger than 1.2 SolarMasses for which age estimates are more accurately determined. The chance ofthis pattern arising by chance has been computed to 7%. This appears inaccordance with tidal dissipation where non-coplanar hot Jupiters' orbitstidally realign. The results show they would do so within about 2.5 Gyr. Forthe considered sample, the results give support to hot Jupiters being placed onnon coplanar orbits early in their history rather than this happening late.Such events could involve strong planet-planet scattering.

The Time Dependence of hot Jupiters' Orbital Inclinations