Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Pyrat Bay Framework for Exoplanet Atmospheric Modeling: A Population
  Study of Hubble/WFC3 Transmission Spectra   We present the open-source pyratbay framework for exoplanet atmospheric
modeling, spectral synthesis, and Bayesian retrieval. The modular design of the
code allows the users to generate atmospheric 1D parametric models of the
temperature, abundances (in thermochemical equilibrium or
constant-with-altitude), and altitude profiles in hydrostatic equilibrium;
sample ExoMol and HITRAN line-by-line cross sections with custom resolving
power and line-wing cutoff values; compute emission or transmission spectra
considering cross sections from molecular line transitions, collision-induced
absorption, Rayleigh scattering, gray clouds, and alkali resonance lines; and
perform Markov chain Monte Carlo atmospheric retrievals for a given transit or
eclipse dataset. We benchmarked the pyratbay framework by reproducing
line-by-line cross-section sampling of ExoMol cross sections, producing
transmission and emission spectra consistent with petitRADTRANS models,
accurately retrieving the atmospheric properties of simulated transmission and
emission observations generated with TauREx models, and closely reproducing
Aura retrieval analyses of the space-based transmission spectrum of HD 209458b.
Finally, we present a retrieval analysis of a population of transiting
exoplanets, focusing on those observed in transmission with the HST WFC3/G141
grism. We found that this instrument alone can confidently identify when a
dataset shows H2O-absorption features; however, it cannot distinguish whether a
muted H2O feature is caused by clouds, high atmospheric metallicity, or low H2O
abundance. Our results are consistent with previous retrieval analyses. The
pyratbay code is available at PyPI (pip install pyratbay) and conda. The code
is heavily documented (https://pyratbay.readthedocs.io) and tested to provide
maximum accessibility to the community and long-term development stability.

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The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
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The categories of this paper are: mtrl-th
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The categories of this paper are: econ
12
The categories of this paper are: nucl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
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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: math
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The categories of this paper are: gr-qc
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The categories of this paper are: alg-geom
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The categories of this paper are: q-fin