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1 results

  • Hα Absorption in Transiting Exoplanet Atmospheres

  • Duncan Christie, Phil Arras, Zhi-Yun Li
  • Journal:
    Proceedings of the International Astronomical Union / Volume 8 / Issue S299 / June 2013
    Published online by Cambridge University Press:
    06 January 2014, pp. 281-282
    Print publication:
    June 2013
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  • Recent observations by Jensen et al. of Hα absorption by the upper atmosphere of HD189733b have motivated the need for a theoretical understanding of the distribution of n=2 hydrogen within hot Jupiter atmospheres. With this in mind, we model the n=2 state of atomic hydrogen in a hydrostatic atmosphere in thermal and photoionization equilibrium. Both collisional and radiative transitions are included in the calculation of the n = 2 state level population. In our model, the Hα absorption is dominated by a τ ~ 1 shell composed of metastable 2s hydrogen located within the neutral atomic layer, with the contribution coming roughly uniformly throughout the layer instead of from a specific impact parameter. An ionization rate an order of magnitude over the expected value can reproduce the observed transit depth.