Other
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dda....39.0606m&link_type=abstract
American Astronomical Society, DDA meeting #39, #6.06
Other
Scientific paper
Strong tidal interaction with the central star can circularize the orbits of close-in planets. With the standard tidal quality factor Q of our solar system, estimated circularization timescales for close-in extrasolar planets are typically shorter than the lifetime of the host stars. While most extrasolar planets with small orbital radii (a<0.1 AU) have nearly circular orbits, recent observations have revealed a handful of planets with substantially large orbital eccentricities. This new class of ``eccentric close-in planets'' implies that either the tidal Q factor is underestimated, or the orbital circularization is prevented by other perturbation mechanisms. We constrain the tidal Q factor for transiting extrasolar planets by comparing the circularization timescales with accurately determined stellar ages. Using the estimated secular perturbation timescales, we also provide constraints on the properties of hypothetical secondary planets exterior to the known eccentric close-in planets.
Matsumura Soko
Rasio Frederic A.
Takeda Genya
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