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Obliquity Variability of Terrestrial Planets in the Habitable Zone

Published online by Cambridge University Press:  13 January 2020

Yutong Shan  and
Gongjie Li
Yutong Shan
Affiliation:
Harvard-Smithsonian Center for Astrophysics, The Institute for Theory and Computation, 60 Garden Street, Cambridge, MA 02138, USA email: yshan@cfa.harvard.edu
Gongjie Li
Affiliation:
Harvard-Smithsonian Center for Astrophysics, The Institute for Theory and Computation, 60 Garden Street, Cambridge, MA 02138, USA email: yshan@cfa.harvard.edu Center for Relativistic Astrophysics, School of Physics, Georgia Institute of Technology, Atlanta, GA 30332, USA email: gongjie.li@physics.gatech.edu
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Abstract

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Obliquity (axial tilt) and its variability could play an important role in the climate and habitability of a planet. We explore the spin-axis dynamics of two specific habitable zone exoplanets, Kepler-62f and Kepler-186f, using numerical and analytical techniques. Based on our current understanding of their orbital architecture, we find that, in contrast with the typical conditions in the Solar System, Kepler-62f and 186f should have low obliquity variations except in fine-tuned conditions. Extra undetected planetary companions and/or the existence of a satellite could either stabilize or destabilize obliquities at a variety of values.

Keywords

methods: analyticalmethods: numericalplanetary systemscelestial mechanics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S345: Origins: From the Protosun to the First Steps of Life , August 2018 , pp. 291 - 292
Copyright
© International Astronomical Union 2020 

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