Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cleaning our Hazy Lens: Statistical Trends in Transmission Spectra of
  Warm Exoplanets   Relatively little is understood about the atmospheric composition of
temperate to warm exoplanets (equilibrium temperature $T_{\rm eq}<$ 1000 K), as
many of them are found to have uncharacteristically flat transmission spectra.
Their flattened spectra are likely due to atmospheric opacity sources such as
planet-wide photochemical hazes and condensation clouds. We compile the
transmission spectra of 23 warm exoplanets previously observed by the
\textit{Hubble Space Telescope} and quantify the haziness of each exoplanet
using a normalized amplitude of the water absorption feature ($A_{\rm H}$). By
examining the relationships between $A_{\rm H}$ and various planetary and
stellar forcing parameters, we endeavor to find correlations of haziness
associated with planetary properties. Our analysis shows that the previously
identified linear trends between $A_{\rm H}$ and $T_{\rm{eq}}$ or
hydrogen-helium envelope mass fraction (f$_{\rm{HHe}}$) break down with the
addition of new exoplanet data. Among all the parameters we investigated,
atmospheric scale height ($H$), planet gravity ($g_{\rm p}$), and planet
density ($\rho_{\rm p}$) hold the most statistically significant linear or
linear logarithmic correlations with $A_{\rm H}$ ($p\leq0.02$). We also
tentatively identified positive correlations for eccentricity ($e$) and stellar
age ($t_{\rm age}$) with $A_{\rm H}$. Specifically, lower $H$, higher $g_{\rm
p}$, $\rho_{\rm p}$, $e$, or $t_{\rm age}$ lead to clearer atmospheres.
However, none of the parameters show very strong linear correlations with
$A_{\rm H}$, suggesting that haziness in warm exoplanets is not simply
controlled by any single planetary/stellar parameter. Additional observations
and laboratory experiments are needed to fully understand the complex physical
and chemical processes that lead to the hazy/cloudy atmospheres in warm
exoplanets.

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The categories of this paper are: nucl-th
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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: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: funct-an
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The categories of this paper are: math
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The categories of this paper are: supr-con
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The categories of this paper are: atom-ph
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The categories of this paper are: physics
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The categories of this paper are: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ex