Barton, EJ;
Hill, C;
Yurchenko, SN;
Tennyson, J;
Dudaryonok, AS;
Layrentieva, NN;
(2017)
Pressure-dependent water absorption cross sections for exoplanets and other atmospheres.
Journal of Quantitative Spectroscopy and Radiative Transfer
, 187
pp. 453-460.
10.1016/j.jqsrt.2016.10.024.
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Abstract
Many atmospheres (cool stars, brown dwarfs, giant planets, extrasolar planets) are predominately composed of molecular hydrogen and helium. H216O is one of the best measured molecules in extrasolar planetary atmospheres to date and a major compound in the atmospheres of brown-dwarfs and oxygen-rich cool stars, yet the scope of experimental and theoretical studies on the pressure broadening of water vapour lines by collision with hydrogen and helium remains limited. Theoretical H2- and He-broadening parameters of water vapour lines (rotational quantum number J up to 50) are obtained for temperatures in the range 300–2000 K. Two approaches for calculation of line widths were used: (i) the averaged energy difference method and (ii) the empirical expression for J′J″-dependence. Voigt profiles based on these widths and the BT2 line list are used to generate high resolution (View the MathML source) pressure broadened cross sections for a fixed range of temperatures and pressures between 300 and 2000 K and 0.001–10 bar. An interpolation procedure which can be used to determine cross sections at intermediate temperature and pressure is described. Pressure broadening parameters and cross sections are presented in new ExoMol format.
Type: | Article |
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Title: | Pressure-dependent water absorption cross sections for exoplanets and other atmospheres |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1016/j.jqsrt.2016.10.024 |
Publisher version: | http://dx.doi.org/10.1016/j.jqsrt.2016.10.024 |
Language: | English |
Additional information: | Copyright © 2016 The Author(s). Published by Elsevier Inc. This is an open access article under the Creative Commons Attribution 4.0 International (CC BY 4.0) license (http://creativecommons.org/licenses/by/4.0/) |
Keywords: | Physical Sciences, Technology, Optics, Spectroscopy, Water, Cross sections, Pressure broadening, Atmospheres, Extrasolar planets, BT2, Composition, Robert-Bonamy Formalism, Broadening Parameters, Mu-m, Vapor Transitions, Helium Pressure, Carbon-monoxide, Half-widths, Brown Dwarf, H2o Lines, Theoretical Calculations |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
URI: | https://discovery.ucl.ac.uk/id/eprint/1527437 |
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