A survey for planetary transits in the field of NGC 7789

D M Bramich, K Horne, I A Bond, R A Street, A C Cameron, B Hood, J Cooke, D James, T A Lister, D Mitchell, K Pearson, A Penny, A Quirrenbach, N Safizadeh, Y Tsapras

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43 Citations (Scopus)

Abstract

We present results from 30 nights of observations of the open cluster NGC 7789 with the Wide Field Camera on the Isaac Newton Telescope, La Palma. From ∼ 900 epochs, we obtained light curves and Sloan colours for ∼ 33 000 stars, with ∼ 2400 stars having better than 1 per cent precision. We expected to detect ∼ 2 transiting hot Jupiter planets if 1 per cent of stars host such a companion and a typical hot Jupiter radius is ∼ 1.2 R-J. We find 24 transit candidates, 14 of which we can assign a period. We rule out the transiting planet model for 21 of these candidates using various robust arguments. For two candidates, we are unable to decide on their nature, although it seems most likely that they are eclipsing binaries as well. We have one candidate exhibiting a single eclipse, for which we derive a radius of 1.81(-0.00)(+0.09) R-J. Three candidates remain that require follow-up observations in order to determine their nature.

Original languageEnglish
Pages (from-to)1096-1116
Number of pages21
JournalMonthly Notices of the Royal Astronomical Society
Volume359
DOIs
Publication statusPublished - 21 May 2005

Keywords

  • methods : data analysis
  • binaries : eclipsing
  • Hertzsprung-Russell (HR) diagram
  • planetary systems
  • open clusters and associations : general
  • open clusters and associations : individual :
  • NGC 7789
  • GRAVITATIONAL LENSING EXPERIMENT
  • LUMINOSITY OBJECT TRANSITS
  • IMAGE SUBTRACTION PHOTOMETRY
  • CLUSTERS EXTENSIVE SEARCH
  • EXTRASOLAR PLANETS
  • GALACTIC DISK
  • 2001 CAMPAIGN
  • STAR
  • EXPLORE/OC
  • CANDIDATES

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