Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sulfur-driven Haze Formation in Warm CO2-rich Exoplanet Atmospheres   Sulfur gases significantly affect the photochemistry of planetary atmospheres
in our Solar System, and are expected to be important components in exoplanet
atmospheres. However, sulfur photochemistry in the context of exoplanets is
poorly understood due to a lack of chemical-kinetics information for sulfur
species under relevant conditions. Here, we study the photochemical role of
hydrogen sulfide (H2S) in warm CO2-rich exoplanet atmospheres (800 K) by
carrying out laboratory simulations. We find that H2S plays a significant role
in photochemistry, even when present in the atmosphere at relatively low
concentrations (1.6%). It participates in both gas and solid phase chemistry,
leading to the formation of other sulfur gas products (CH3SH/SO, C2H4S/OCS,
SO2/S2, and CS2) and to an increase in solid haze particle production and
compositional complexity. Our study shows that we may expect thicker haze with
small particle sizes (20 to 140 nm) for warm CO2-rich exoplanet atmospheres
that possess H2S.

29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol
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The categories of this paper are: nlin
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The categories of this paper are: mtrl-th