{
  "id": "0906.1293",
  "version": "v1",
  "published": "2009-06-06T17:48:20.000Z",
  "updated": "2009-06-06T17:48:20.000Z",
  "title": "Detection of Thermal Emission of XO-2b: Evidence for a Weak Temperature Inversion",
  "authors": [
    "Pavel Machalek",
    "Peter R. McCullough",
    "Adam Burrows",
    "Christopher J. Burke",
    "Joseph L. Hora",
    "Christopher M. Johns-Krull"
  ],
  "comment": "17 pages. Accepted for publication in The Astrophysical Journal",
  "journal": "Astrophys.J.701:514-520,2009",
  "doi": "10.1088/0004-637X/701/1/514",
  "categories": [
    "astro-ph.SR",
    "astro-ph.EP"
  ],
  "abstract": "We estimate flux ratios of the extrasolar planet XO-2b to its host star XO-2 at 3.6, 4.5, 5.8 and 8.0 micron with IRAC on the Spitzer Space Telescope to be 0.00081 +- 0.00017, 0.00098 +- 0.00020, 0.00167 +- 0.00036 and 0.00133 +- 0.00049, respectively. The fluxes provide tentative evidence for a weak temperature inversion in the upper atmosphere, the precise nature of which would need to be confirmed by longer wavelength observations. XO-2b substellar flux of 0.76 x 10^9 ergs cm^-2 s^-1 lies in the predicted transition region between atmospheres with and without upper atmospheric temperature inversion.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2009-06-06T17:48:20.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "weak temperature inversion",
      "thermal emission",
      "upper atmospheric temperature inversion",
      "estimate flux ratios",
      "xo-2b substellar flux"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "The Astrophysical Journal",
      "year": 2009,
      "month": "Aug",
      "volume": 701,
      "number": 1,
      "pages": 514
    },
    "note": {
      "typesetting": "TeX",
      "pages": 17,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 822423,
      "adsabs": "2009ApJ...701..514M"
    }
  }
}