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- W3105266952 abstract "NASA's Kepler mission revealed that $sim 30%$ of Solar-type stars harbor planets with sizes between that of Earth and Neptune on nearly circular and co-planar orbits with periods less than 100 days. Such short-period compact systems are rarely found with planet pairs in mean-motion resonances (MMRs) -- configurations in which the planetary orbital periods exhibit a simple integer ratio -- but there is a significant overabundance of planet pairs lying just wide of the first-order resonances. Previous work suggests that tides raised on the planets by the host star may be responsible for forcing systems into these configurations by draining orbital energy to heat. Such tides, however, are insufficient unless there exists a substantial and as-yet unidentified source of extra dissipation. Here we show that this cryptic heat source may be linked to obliquity tides generated when a large axial tilt (obliquity) is maintained by secular resonance-driven spin-orbit coupling. We present evidence that typical compact, nearly-coplanar systems frequently experience this mechanism, and we highlight additional features in the planetary orbital period and radius distributions that may be its signatures. Extrasolar planets that maintain large obliquities will exhibit infrared light curve features that are detectable with forthcoming space missions. The observed period ratio distribution can be explained if typical tidal quality factors for super-Earths and sub-Neptunes are similar to those of Uranus and Neptune." @default.
- W3105266952 created "2020-11-23" @default.
- W3105266952 creator A5073940963 @default.
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- W3105266952 date "2019-03-04" @default.
- W3105266952 modified "2023-10-14" @default.
- W3105266952 title "Obliquity-driven sculpting of exoplanetary systems" @default.
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- W3105266952 doi "https://doi.org/10.1038/s41550-019-0701-7" @default.
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