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Anti-Clockwork Planetary Systems: Long-Lived Chaotic Evolution of Mutually Inclined Exoplanets in Mean Motion Resonances

Rory, Barnes 1 Russell, Deitrick Richard, Greenberg Thomas R., Quinn Sean N. Raymond 2, 3, 4, 5, 6
3 ECLIPSE 2014
L3AB - Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux, OASU - Observatoire aquitain des sciences de l'univers, LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac], Université Sciences et Technologies - Bordeaux 1
Abstract : The orbital evolution of exoplanets in mean motion resonance and with mutual inclinations is often chaotic, with large amplitude variations of eccentricity 0 up to 0.9) and inclination 0 up to 170 degrees). Despite this strongly chaotic behavior, these systems can be stable for 10 Gyr. In cases that survive for only 0.1 to 1 Gyr, eccentricities can aperiodically reach values larger than 0.999 and inclinations larger than 179.9 degrees. Typically, the orbitalbehavior appears to switch between different modes, with the classic eccentricity-type resonance as one mode. Outside of that resonance, the motion cannot be easily characterized as eccentricity- and/or inclination-type, because both operate, with the conjunction longitude librating about specific directions. This phenomenon can affect Earth-mass planets in the habitable zone, potentially altering surface habitability. Planets with eccentricities that approach unity may be tidally circularized while the inclination is at any value, revealing a previously unknown process to produce misalignment between stellarspin axes and hot planets' orbital planes. Finally, we re-examine planet-planet scattering simulations and find they produce these types of systems with a frequency of order 0.5%. Giant planets exhibiting such behavior may be detectable by the GAIA spacecraft.
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Submitted on : Thursday, November 13, 2014 - 11:02:03 AM
Last modification on : Friday, April 5, 2019 - 8:23:32 PM





Rory, Barnes, Russell, Deitrick, Richard, Greenberg, Thomas R., Quinn, Sean N. Raymond. Anti-Clockwork Planetary Systems: Long-Lived Chaotic Evolution of Mutually Inclined Exoplanets in Mean Motion Resonances. American Astronomical Society, DPS meeting #46, #210.19, 2014 - held in Tucson (USA) 2014-11-09, Nov 2014, Tucson, United States. pp.#210.19. ⟨hal-01082301⟩



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