Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Extreme Climate Variations from Milankovitch-like Eccentricity
  Oscillations in Extrasolar Planetary Systems   Although our solar system features predominantly circular orbits, the
exoplanets discovered so far indicate that this is the exception rather than
the rule. This could have crucial consequences for exoplanet climates, both
because eccentric terrestrial exoplanets could have extreme seasonal variation,
and because giant planets on eccentric orbits could excite Milankovitch-like
variations of a potentially habitable terrestrial planet,\"A\^os eccentricity,
on timescales of thousands-to-millions of years. A particularly interesting
implication concerns the fact that the Earth is thought to have gone through at
least one globally frozen, "snowball" state in the last billion years that it
presumably exited after several million years of buildup of greenhouse gases
when the ice-cover shut off the carbonate-silicate cycle. Water-rich extrasolar
terrestrial planets with the capacity to host life might be at risk of falling
into similar snowball states. Here we show that if a terrestrial planet has a
giant companion on a sufficiently eccentric orbit, it can undergo
Milankovitch-like oscillations of eccentricity of great enough magnitude to
melt out of a snowball state.

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The categories of this paper are: stat
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: nlin
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The categories of this paper are: acc-phys