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\title{DEVELOPMENT OF THE EXOMOL DATABASE}

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\author{\underline{\FirstName JINGXIN \LastName ZHANG},
  \FirstName JONATHAN \LastName TENNYSON,
  \FirstName SERGEI N. \LastName YURCHENKO}
\address{Department of Physics and Astronomy, University College London, Gower Street, WC1E 6BT London, United Kingdom}
\author{\FirstName CHRISTIAN \LastName HILL}
\address{Atomic and Molecular Data Unit, International Atomic Energy Agency, Vienna International Centre, PO Box 100 A-1400 Vienna, Austria}


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\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
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The desire to characterize and model the atmospheres of the many extrasolar planets that have been discovered over the last three decades is a major driver of current astronomy \footnote{\href{https://doi.org/10.1093/mnras/stu944}{doi:10.1093/mnras/stu944}, E.J. Barton et al., {\it {Mon. Not. R. Astron. Soc.}\/}, {\bf 442} (2), 1821--1829 (2014).}. This goal is impacted by the lack of spectroscopic data for the molecules in question since it requires significant quantities of spectroscopic data, in many cases billions of lines, to   accurately reproduce the spectroscopic features of the atmospheres of hot exoplanets \footnote{\href{https://doi.org/10.1073/pnas.1324219111}{doi:10.1073/pnas.1324219111}, S.N. Yurchenko et al., {\it {Proc. Nat. Acad. Sci.}\/}, {\bf 111}, 9379-9383 (2014).}. 

The ExoMol database \footnote{\href{https://www.exomol.com/}{https://www.exomol.com/}.} provides molecular data for interpreting spectra and modelling atmospheres of hot exoplanets, cool stars, brown dwarfs, and other hot astronomical atmospheres and its molecules are selected because they are deemed to be important for exoplanets and other studies of hot atmospheres \footnote{\href{https://doi.org/10.1093/astrogeo/atab102}{doi:10.1093/astrogeo/atab102}, J. Tennyson and S.N. Yurchenko, {\it Astron. Geophys.\/}, {\bf 62} (6), 6--16 (2021).}. 
The core of the ExoMol database is comprehensive high-temperature molecular line lists; these are supplemented with partition functions, state lifetimes, cooling functions, Land\'e g-factors, temperature-dependent cross sections, opacities, pressure broadening parameters, k-coefficients and dipoles. 
The ExoMol line lists are systematically published as a series in the journal Monthly Notices of the Royal Astronomical Society and summarised in release papers \footnote{\href{https://doi.org/10.1016/j.jms.2016.05.002}{doi:10.1016/j.jms.2016.05.002}, J. Tennyson et al., {\it {J. Mol. Spectrosc.}\/}, {\bf 327}, 73--94 (2016).}$^{,}$\footnote{\href{https://doi.org/10.1016/j.jqsrt.2020.107228}{doi:10.1016/j.jqsrt.2020.107228}, J. Tennyson et al., {\it {J. Quant. Spectrosc. Radiat. Transf.}\/}, {\bf 255}, 107228 (2020).}. 

The continuous updating of the ExoMol database is  particularly important. Here we present the recent developments of the ExoMol database, which include:   \\


%Spectroscopy is an underpinning technique widely applicable to many areas of science, not just astronomy and geophysics \cite{5}. 

%Computing more line lists is one obvious continuing activity, as requests for these are still coming thick and fast. 





%Recent development of the ExoMol database include:\\
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\begin{enumerate}
\itemsep=-15pt
    \item Photodissociation cross sections and continuum absorption \footnote{\href{https://doi.org/10.1093/rasti/rzad014}{doi:10.1093/rasti/rzad014} J. Tennyson et al., \textit{RASTI}, \textbf{2}, 231 (2023).};\\
    \item Collisional broadening \footnote{\href{https://doi.org/10.1093/rasti/rzac004}{10.1093/rasti/rzac004} J. Buldyreva et al., \textit{RASTI}, \textbf{1}, 43  (2022).};\\
    \item MARVELisation of line lists with and inclusion of uncertainties;\\
    \item JSON format for the line list APIs (Application Programming Interface);\\
    \item Adopting the IAEA (International Atomic Energy Agency) standards for the  atomic and molecular information;\\
    \item Ancillary database LiDB: Molecular vibronic state radiative lifetimes for plasma processes  \footnote{A. Owens et al., {\it {Plasma Sources Sci. Technol.}\/}, in press (2023).};\\
    \item High-resolution line list database ExoMolHR \footnote{Jingxin Zhang et al., ``ExomolHR: High-resolution ExoMol linelists'', {In preparation} (2023).}; \\
    \item A Python program PyExoCross \footnote{\href{https://github.com/ExoMol/PyExoCross.git}{https://github.com/ExoMol/PyExoCross.git}} is designed to post process both ExoMol and HITRAN line lists \footnote{Jingxin Zhang et al., ``\texttt{PyExoCross}: a Python program for generating spectra from molecular line lists'', {In preparation} (2023).}.\\
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