Obliquity Variations of a Moonless Earth

Details Obliquity Variations of a Moonless Earth Obliquity Variations of a Moonless Earth

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21840208l&link_type=abstract

American Astronomical Society, AAS Meeting #218, #402.08; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We numerically explore the obliquity (axial tilt) variations of a hypothetical moonless Earth. Previous work has shown that the Earth's Moon stabilizes Earth's obliquity such that it remains within a narrow range, between 22.1° and 24.5°. Without lunar influence, a frequency map analysis by Laskar et al. (1993 Nature 361, 615) showed that the obliquity could vary between 0° and 85°. Using a modified version of the orbital integrator mercury, we calculate the obliquity evolution for moonless Earths with various initial conditions for up to 4 billion years. We find many configurations in which obliquity variations are small. This implies that moonless extrasolar planets may well have the climate stability thought to be required for the development of advanced life.

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