Tidal interaction between Exoplanets and their host stars. Implications for orbit stability and stellar rotation evolution

Details Tidal interaction between Exoplanets and their host stars. Implications for orbit stability and stellar rotation evolution Tidal interaction between Exoplanets and their host stars. Implications for orbit stability and stellar rotation evolution

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..876c&link_type=abstract

European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a

Physics

Scientific paper

Abstract Very close-in extrasolar planets are subject to strong tidal interactions with their host star. This may lead to the decay of the semi major axis and to an nonnegligable spinup of the star. The magnitude of tidal interactions, however, depends on the ratio of the stellar dissipation factor and the stellar Love number. While we were able to constrain the large uncertainties of these constants for the planetary system OGLE-TR-56b by simulating the evolution into the past and future thus gaining important insights into the inner structure of this host star, there still are large discrepancies between the values predicted by different theories for main sequence stars. This open question: how strongly close-in extrasolar planets and Brown Dwarfs are affected by tidal interaction can only be decided by evaluating a large sample of suitable examples and evaluating under which conditions short period planets and Brown Dwarfs can exist. In preparation for the large numbers of short period planets to be detected by the space missions Corot and Kepler we present a systematic study of stability conditions with respect to different values of the stellar dissipation factor and the stellar Love number. We further investigate the special cases of doublesynchronous rotations induced by tidal interactions. Tau Bootis b and HD 41004B b are examples for this scenario and show indication of spin-up due to tidal interaction, suggesting that tidal interactions are indeed efficient mechanisms in affecting the stellar rotation evolution.

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