J/A+A/628/A120 Stellar atmosphere opacity Na broadened by H2 (Allard+, 2019)
New study of the line profiles of sodium perturbed by H2.
Allard N.F., Spiegelman F., Leininger T., Molliere P.
<Astron. Astrophys. 628, A120 (2019)>
=2019A&A...628A.120A 2019A&A...628A.120A (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics ; Line Profiles ; Opacities
Keywords: lines: profiles - molecular data - brown dwarfs
Abstract:
The opacity of alkali atoms, most importantly of Na and K, plays a
crucial role in the atmospheres of brown dwarfs and exoplanets.
Wepresent a comprehensive study of Na-H2 collisional profiles at
temperatures from 500 to 3000K, the temperatures prevailing in
the atmosphere of brown dwarfs and Jupiter-mass planets. The relevant
H2perturber densities reach several 1019cm-3 in hot (Teff≥1500K)
Jupiter-mass planets and can exceed 1020cm-3 for more massive or
cooler objects. Accurate pressure-broadened profiles that arevalid at
high densities of H2 should be incorporated into spectral models.
Unified profiles of sodium perturbed by molecular hydrogenwere
calculated in the semi-classical approach using up-to-date molecular
data. New Na-H2 collisional profiles and their effects on the
synthetic spectra of brown dwarfs and hot Jupiters computed with
petitCODE are presented.
Description:
We performed theoretical calculations of the collisional profiles of
the resonance lines of Na perturbed by H2 using a unified theory of
spectral line broadening and high-quality ab initio potentials and
transition moments.
The file opacity.tar contains the opacity tables for NaH2, the
programs to read the tables, examples for the D1 and D2 components of
the resonance line, a file README.pdf for the description of the
opacity tables and explanations of their use.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
opacity.tar 512 820 Opacity tables for NaH2, programs and examples
README.pdf 512 137 Description of the opacity tables and
explanations of their use
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Acknowledgements:
Nicole Allard, nicole.allard(at)obspm.fr
(End) Patricia Vannier [CDS] 09-Aug-2019