Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-03-02
Mon.Not.Roy.Astron.Soc. 359 (2005) 1096-1116
Astronomy and Astrophysics
Astrophysics
22 pages, 13 figures, accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2005.08973.x
We present results from 30 nights of observations of the open cluster NGC 7789 with the WFC camera on the INT telescope in La Palma. From ~900 epochs, we obtained lightcurves and Sloan r-i colours for ~33000 stars, with ~2400 stars with better than 1% precision. We expected to detect ~2 transiting hot Jupiter planets if 1% of stars host such a companion and that a typical hot Jupiter radius is ~1.2RJ. 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 2 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+0.09-0.00RJ. Three candidates remain that require follow-up observations in order to determine their nature.
Bond Ian A.
Bramich Daniel M.
Collier Cameron Andrew
Cooke Jeff
Hood Ben
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