New study of the line profiles of sodium perturbed by H 2
Résumé
The opacity of alkali atoms, most importantly of Na and K, plays a crucial role in the atmospheres of brown dwarfs and exoplanets. We present a comprehensive study of Na-H 2 collisional profiles at temperatures from 500 to 3000 K, the temperatures prevailing in the atmosphere of brown dwarfs and Jupiter-mass planets. The relevant H 2 perturber densities reach several 10 19 cm −3 in hot (T eff 1500 K) Jupiter-mass planets and can exceed 10 20 cm −3 for more massive or cooler objects. Accurate pressure-broadened profiles that are valid at high densities of H 2 should be incorporated into spectral models. Unified profiles of sodium perturbed by molecular hydrogen were calculated in the semi-classical approach using up-to-date molecular data. New Na-H 2 collisional profiles and their effects on the synthetic spectra of brown dwarfs and hot Jupiters computed with petitCODE are presented.
Origine | Publication financée par une institution |
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