Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542314p&link_type=abstract
American Astronomical Society, AAS Meeting #215, #423.14; Bulletin of the American Astronomical Society, Vol. 42, p.328
Astronomy and Astrophysics
Astronomy
Scientific paper
In recent years it has been shown that the tidal coupling between extrasolar planets and their stars could be an important mechanism leading to orbital evolution. Both the tides the planet raises on the star and vice versa are important and dissipation efficiencies ranging over four orders of magnitude are being used. In addition, the discovery of extrasolar planets extremely close to their stars has made it clear that the estimates of the tidal quality factor of the stars based on Jupiter and its satellite system and on main sequence binary star observations are too high, resulting in lifetimes for the closest planets several orders of magnitude smaller than their age.
We argue that those estimates of the tidal dissipation efficiency are not applicable for stars with spin periods much longer than the extrasolar planets' orbital period. We address the problem by applying our own values for the dissipation efficiency of tides based on numerical simulations of externally perturbed patches of stellar-like convection and derive future lifetimes and transit timing variations due to the tidal coupling. The resulting lifetimes are comparable to or much longer than the ages of the observed extrasolar planetary systems.
Penev Kaloyan
Sasselov Dimitar D.
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