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|a Lewis, Nikole K.
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|a Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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|a de Wit, Julien
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|a Knutson, Heather A.
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|a Fuller, Jim
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|a Antoci, Victoria
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|a Fulton, Benjamin J.
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|a Laughlin, Gregory
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|a Deming, Drake
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|a Shporer, Avi
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|a Batygin, Konstantin
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|a Cowan, Nicolas B.
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|a Agol, Eric
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|a Burrows, Adam S.
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|a Fortney, Jonathan J.
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|a Langton, Jonathan
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|a Showman, Adam P.
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|a de Wit, Julien
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|a Planet-induced Stellar Pulsations in HAT-P-2's Eccentric System
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|c 2017-06-21T20:01:44Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/110154
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|a Extrasolar planets on eccentric short-period orbits provide a laboratory in which to study radiative and tidal interactions between a planet and its host star under extreme forcing conditions. Studying such systems probes how the planet's atmosphere redistributes the time-varying heat flux from its host and how the host star responds to transient tidal distortion. Here, we report the insights into the planet-star interactions in HAT-P-2's eccentric planetary system gained from the analysis of ~350 hr of 4.5 μm observations with the Spitzer Space Telescope. The observations show no sign of orbit-to-orbit variability nor of orbital evolution of the eccentric planetary companion, HAT-P-2 b. The extensive coverage allows us to better differentiate instrumental systematics from the transient heating of HAT-P-2 b's 4.5 μm photosphere and yields the detection of stellar pulsations with an amplitude of approximately 40 ppm. These pulsation modes correspond to exact harmonics of the planet's orbital frequency, indicative of a tidal origin. Transient tidal effects can excite pulsation modes in the envelope of a star, but, to date, such pulsations had only been detected in highly eccentric stellar binaries. Current stellar models are unable to reproduce HAT-P-2's pulsations, suggesting that our understanding of the interactions at play in this system is incomplete.
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|a en_US
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|a Article
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|t Astrophysical Journal. Letters
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