{
  "id": "astro-ph/0308413",
  "version": "v1",
  "published": "2003-08-23T14:51:00.000Z",
  "updated": "2003-08-23T14:51:00.000Z",
  "title": "A new upper limit on the reflected starlight from Tau Bootis b",
  "authors": [
    "C. Leigh",
    "A. Collier Cameron",
    "K. Horne",
    "A. Penny",
    "D. James"
  ],
  "comment": "13 pages, 18 figures, MNRAS accepted 12 June 2003",
  "journal": "Mon.Not.Roy.Astron.Soc.344:1271,2003",
  "doi": "10.1046/j.1365-8711.2003.06901.x",
  "categories": [
    "astro-ph"
  ],
  "abstract": "Using improved doppler tomographic signal-analysis techniques we have carried out a deep search for starlight reflected from the giant planet orbiting the star Tau Bootis. We combined echelle spectra secured at the 4.2 m William Herschel telescope in 1998 and 1999 (which yielded a tentative detection of a reflected starlight component from the orbiting companion) with new data obtained in 2000 (which failed to confirm the detection). The combined dataset comprises 893 high resolution spectra with a total integration time of 75 hr 32 min spanning 17 nights. We establish an upper limit on the planet's geometric albedo p<0.39 (at the 99.9 % significance level) at the most probable orbital inclination i=36 degrees, assuming a grey albedo, a Venus-like phase function and a planetary radius R_p=1.2 R_Jup. We are able to rule out some combinations of the predicted planetary radius and atmospheric albedo models with high, reflective cloud decks. Although a weak candidate signal appears near to the most probable radial velocity amplitude, its statistical significance is insufficient for us to claim a detection with any confidence.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2003-08-23T14:51:00.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "upper limit",
      "reflected starlight",
      "doppler tomographic signal-analysis techniques",
      "weak candidate signal appears",
      "planetary radius"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 13,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 626477
    }
  }
}