A new upper limit on the reflected starlight from τ Bootis b

Christopher Leigh, Andrew Collier Cameron, Keith Douglas Horne, Alan Penny, David James

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)

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 data set comprises 893 high-resolution spectra with a total integration time of 75(h) 32(m) spanning 17 nights. We establish an upper limit on the planet's geometric albedo p < 0.39 (at the 99.9 per cent significance level) at the most probable orbital inclination i &SIME; 36&DEG;, 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.

Original languageEnglish
Pages (from-to)1271-1282
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume344
Issue number4
Publication statusPublished - 1 Oct 2003

Keywords

  • methods : data analysis
  • techniques : spectroscopic
  • stars : individual : tau Bootis planetary systems
  • EXTRASOLAR GIANT PLANETS
  • STARS
  • ATMOSPHERES
  • SPECTRA
  • ALBEDO

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