Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evolution of Earth-like extended exospheres orbiting solar-like stars   Recent observations of the Earth's exosphere revealed the presence of an
extended hydrogenic component that could reach distances beyond 40 planetary
radii. Detection of similar extended exospheres around Earth-like exoplanets
could reveal crucial facts in terms of habitability. The presence of these
rarified hydrogen envelopes is extremely dependent of the planetary
environment, dominated by the ionizing radiation and plasma winds coming from
the host star. Radiation and fast wind particles ionize the uppermost layers of
planetary atmospheres, especially for planets orbiting active, young stars. The
survival of the produced ions in the exosphere of such these planets is subject
to the action of the magnetized stellar winds, particularly for unmagnetized
bodies. In order to address these star-planet interactions, we have carried out
numerical 2.5D ideal MHD simulations using the PLUTO code to study the
dynamical evolution of tenuous, hydrogen-rich, Earth-like extended exospheres
for an unmagnetized planet, at different stellar evolutionary stages: from a
very young, solar-like star of 0.1 Gyr to a 5.0 Gyr star. For each star-planet
configuration, we show that the morphology of extended Earth-like hydrogen
exospheres is strongly dependent of the incident stellar winds and the produced
ions present in these gaseous envelopes, showing that the ionized component of
Earth-like exospheres is quickly swept by the stellar winds of young stars,
leading to large bow shock formation for later stellar ages.

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The categories of this paper are: atom-ph
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The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: math
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The categories of this paper are: stat
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The categories of this paper are: hep-th
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The categories of this paper are: patt-sol
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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-ex