{
  "id": "0902.3994",
  "version": "v1",
  "published": "2009-02-23T21:00:06.000Z",
  "updated": "2009-02-23T21:00:06.000Z",
  "title": "The origin of hydrogen around HD 209458b",
  "authors": [
    "A. Lecavelier des Etangs",
    "A. Vidal-Madjar",
    "J. -M. Desert"
  ],
  "comment": "Brief Communications Arising, Nature 456, E1 (2008) (2008Natur.456....1L)",
  "categories": [
    "astro-ph.EP"
  ],
  "abstract": "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).",
  "revisions": [
    {
      "version": "v1",
      "updated": "2009-02-23T21:00:06.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "hd 209458b",
      "radiation pressure",
      "high-velocity hydrogen atoms",
      "energetic neutral atom",
      "peculiar stellar wind"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 814014,
      "adsabs": "2009arXiv0902.3994L"
    }
  }
}