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Non-LTE Effects of Na I in the Atmosphere of HD209458b
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The recent announcement that sodium absorption has been observed in the atmosphere of HD209458b, the only EGP observed to transit its parent star, is the first direct detection of an EGP atmosphere. We explore the possibility that neutral sodium is {\em not} in local thermodynamic equilibrium (LTE) in the outer atmosphere of irradiated EGPs and that the sodium concentration may be underestimated by models that make the LTE assumption. Our results indicate that it may not be necessary to invoke excessive photoionization, low metallicity, or even high altitude clouds to explain the observations.
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Cited by 1 Pith paper
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3D Non-LTE radiation transfer: theory and applications to stars, exoplanets, and kilonovae
A field review of 3D non-LTE radiative transfer argues that 1D LTE treatments of stellar, exoplanet, and kilonova spectra carry systematic abundance biases that 3D NLTE modeling can now remove.
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