Energetic Neutral Atoms Around the Extrasolar Planet HD 209458b
Abstract
Observed atomic hydrogen absorption in the stellar Lyman-alpha line by the planet HD 209458b shows hydrogen with high velocity at great distances from the planet. This has been interpreted as hydrogen atoms undergoing hydrodynamic escape. We estimate the production of energetic neutral atoms from the interaction of the stellar wind with the extrasolar planet HD 209458b, and the implications for observations of atomic hydrogen. The estimated production of hydrogen-energetic neutral atoms is compared with observations.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2007
- Bibcode:
- 2007AGUFMSH12A0857H
- Keywords:
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- 0328 Exosphere;
- 0343 Planetary atmospheres (5210;
- 5405;
- 5704);
- 0545 Modeling (4255);
- 2151 Neutral particles (7837);
- 6296 Extra-solar planets