The Importance of High Temperature Molecular Opacity in Model Simulations.

Details The Importance of High Temperature Molecular Opacity in Model Simulations. The Importance of High Temperature Molecular Opacity in Model Simulations.

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.1222f&link_type=abstract

American Astronomical Society, DPS meeting #28, #12.22; Bulletin of the American Astronomical Society, Vol. 28, p.1115

Statistics

Computation

Scientific paper

The recent discoveries of extra solar giant planets and brown dwarf candidates has increased the importance of including high temperature opacity sources in any model atmosphere simulation. At least some of these new planets may have effective temperatures exceeding 1000 K because of the effects of stellar insolation combined with the small size of their orbits, while an analysis of one brown dwarf candidate by Marley et al. 1996, (Science, 272, 1919) found a T_eff= 960 +/- 70K. As an illustration of what is now possible using the latest computational techniques, two new high temperature H2O databases Wattson 1996, (unpublished), and Schwenke and Partridge 1996, (unpublished) are compared with the latest version of the Hitran 96 database to show the effects at elevated temperatures of the inclusion of lines originating from high energy levels. Examples will be shown of comparisons at different temperatures to illustrate the importance of the new databases, and how databases based only on room temperature observations can seriously underestimate the opacity. The effects are largest in regions dominated by lines that originate from highly excited levels. These lines may be quite weak at room temperatures, and in some cases are excluded from databases, such as Hitran, for this reason. However, at high temperatures the line strength will grow considerably due to the dependence on the factor exp (-hcsigma /kT). Omission of these lines would cause spurious "windows" to appear in the calculations at higher temperatures. A brief discussion will be included of the techniques used in the calculations of the databases and in their validation. Also the possible extension of these techniques to other molecules will be discussed.

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