Upper limits on the hot Jupiter fraction in the field of NGC 7789

D. M. Bramich, Keith Horne

Research output: Contribution to journalArticle

10 Citations (Scopus)


We describe a method of estimating the abundance of short-period extra-solar planets based on the results of a photometric survey for planetary transits. We apply the method to a 21night survey with the 2.5-m Isaac Newton Telescope of ∼32 000 stars in a ∼0.5 × 0.5 deg 2 field including the open cluster NGC 7789. From the colour-magnitude diagram, we estimate the mass and radius of each star by comparison with the cluster main sequence. We search for injected synthetic transits throughout the light curve of each star in order to determine their recovery rate, and thus calculate the expected number of transit detections and false alarms in the survey. We take proper account of the photometric accuracy, time sampling of the observations and criteria (signal-to-noise ratio and number of transits) adopted for transit detection. Assuming that none of the transit candidates found in the survey will be confirmed as real planets, we place conservative upper limits on the abundance of planets as a function of planet radius, orbital period and spectral type.

Original languageEnglish
Pages (from-to)1677-1685
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Publication statusPublished - 1 Apr 2006
Externally publishedYes



  • Methods: statistical
  • Open clusters and associations: individual: NGC 7789
  • Planetary systems

ASJC Scopus subject areas

  • Space and Planetary Science

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