Non-LTE Effects of Na I in the Atmosphere of HD209458b

Details Non-LTE Effects of Na I in the Atmosphere of HD209458b Non-LTE Effects of Na I in the Atmosphere of HD209458b

2002-03-08

arxiv.org/abs/astro-ph/0203139v1

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1086/340579

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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