SIMBAD references

2018AJ....155...60D - Astron. J., 155, 60-60 (2018/February-0)

Exo-Milankovitch cycles. I. Orbits and rotation states.

DEITRICK R., BARNES R., QUINN T.R., ARMSTRONG J., CHARNAY B. and WILHELM C.

Abstract (from CDS):

The obliquity of the Earth, which controls our seasons, varies by only ∼2.°5 over ∼40,000 years, and its eccentricity varies by only ∼0.05 over 100,000 years. Nonetheless, these small variations influence Earth's ice ages. For exoplanets, however, variations can be significantly larger. Previous studies of the habitability of moonless Earth-like exoplanets have found that high obliquities, high eccentricities, and dynamical variations can extend the outer edge of the habitable zone by preventing runaway glaciation (snowball states). We expand upon these studies by exploring the orbital dynamics with a semianalytic model that allows us to map broad regions of parameter space. We find that, in general, the largest drivers of obliquity variations are secular spin-orbit resonances. We show how the obliquity varies in several test cases, including Kepler-62 f, across a wide range of orbital and spin parameters. These obliquity variations, alongside orbital variations, will have a dramatic impact on the climates of such planets.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): planetary systems - planets and satellites: atmospheres - planets and satellites: dynamical evolution and stability - planets and satellites: dynamical evolution and stability

Simbad objects: 10

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2019.10.20-12:14:34

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