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A Search for H-alpha Absorption in the Exosphere of the Transiting Extrasolar Planet HD 209458b

Authors
  • Winn, Joshua N.
  • Suto, Yasushi
  • Turner, Edwin L.
  • Narita, Norio
  • Frye, Brenda L.
  • Aoki, Wako
  • Sato, Bunei
  • Yamada, Toru
Type
Preprint
Publication Date
Jun 28, 2004
Submission Date
Apr 23, 2004
Identifiers
DOI: 10.1093/pasj/56.4.655
Source
arXiv
License
Unknown
External links

Abstract

There is evidence that the transiting planet HD 209458b has a large exosphere of neutral hydrogen, based on a 15% decrement in Lyman-alpha flux that was observed by Vidal-Madjar et al. during transits. Here we report upper limits on H-alpha absorption by the exosphere. The results are based on optical spectra of the parent star obtained with the Subaru High Dispersion Spectrograph. Comparison of the spectra taken inside and outside of transit reveals no exospheric H-alpha signal greater than 0.1% within a 5.1A band (chosen to have the same Delta_lambda/lambda as the 15% Ly-alpha absorption). The corresponding limit on the column density of n=2 neutral hydrogen is N_2 <~ 10^9 cm^{-2}. This limit constrains proposed models involving a hot (~10^4 K) and hydrodynamically escaping exosphere.

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