Methane Opacities in T Dwarf Atmospheres

Details Methane Opacities in T Dwarf Atmospheres Methane Opacities in T Dwarf Atmospheres

2002-09-09

arxiv.org/abs/astro-ph/0209163v2

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, uses newpasp.sty, to be published in <http://esoads.eso.org/cgi-bin/nph-abs_connect?bibcode=2002sam..workE

Scientific paper

We present the current status of PHOENIX model atmospheres for dwarfs of the spectral type T, typical for older field brown dwarfs and low-mass brown dwarfs. The results are based on new predictions of the CH_4 line opacities from theoretical calculations with the STDS software package, extrapolating to transitions from rotational levels up to J=40. While individual line positions and strengths are reproduced with moderate to fair accuracy, the cumulative band strength in the region of the IR methane bands is modelled much better thanks to the inclusion of large numbers of faint lines relevant at high temperatures.

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