Non-lte Effects of Na I in the Atmosphere of Hd209458b

  title={Non-lte Effects of Na I in the Atmosphere of Hd209458b},
  author={Travis S. Barman and Peter Hauschildt and Andreas Schweitzer and Phillip Stancil},
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 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… CONTINUE READING


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