Journal
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
Volume 187, Issue -, Pages 453-460Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jqsrt.2016.10.024
Keywords
Water; Cross sections; Pressure broadening; Atmospheres; Extrasolar planets; BT2; Composition
Categories
Funding
- Energinet.dk project [2013-1-1027]
- UCL through the Impact Studentship Program
- European Research Council [267219]
- CNRS in the frame of the International Associated Laboratory SAMIA
- RFBR [16-32-00244]
- Science and Technology Facilities Council [ST/M007073/1, ST/M001334/1] Funding Source: researchfish
- STFC [ST/M001334/1, ST/M007073/1] Funding Source: UKRI
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Many atmospheres (cool stars, brown dwarfs, giant planets, extrasolar planets) are predominately composed of molecular hydrogen and helium. (H2O)-O-16 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 H-2- 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 (Delta(v) over bar = 0.01 cm(-1)) 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. (C) 2016 Elsevier Ltd. All rights reserved.
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