The origin of hydrogen around HD 209458b
| dc.creator | Etangs, A. Lecavelier des | |
| dc.creator | Vidal-Madjar, A. | |
| dc.creator | Desert, J. -M. | |
| dc.date | 2009-02-23 | |
| dc.date.accessioned | 2026-07-07T12:46:08Z | |
| dc.date.available | 2026-07-07T12:46:08Z | |
| dc.description | Using numerical simulation, Holmstrom et al. (2008) proposed a plausible alternative explanation of the observed Lyman-alpha absorption that was seen during the transit of HD 209458b (Vidal-Madjar et al. 2003). They conclude that radiation pressure alone cannot explain the observations and that a peculiar stellar wind is needed. Here we show that radiation pressure alone can in fact produce the observed high-velocity hydrogen atoms. We also emphasize that even if the stellar wind is responsible for the observed hydrogen, to have a sufficient number of atoms for charge exchange with stellar wind, the energetic neutral atom (ENA) model also needs a significant escape from the planet atmosphere of similar amplitude as quoted in Vidal-Madjar et al.(2003). | |
| dc.description | Brief Communications Arising, Nature 456, E1 (2008) (2008Natur.456....1L) | |
| dc.identifier | https://arxiv.org/abs/0902.3994 | |
| dc.identifier | http://arxiv.org/abs/0902.3994 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/221280 | |
| dc.subject | Earth and Planetary Astrophysics | |
| dc.title | The origin of hydrogen around HD 209458b | |
| dc.type | text |