| Institution: | School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9SS;Instituto de Astrofisica de Canarias, C/Via Lactea s/n, E-38200 La Laguna,Tenerife, Spain;Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ;Institute for Information and Mathematical Sciences, Massey University, Auckland, New Zealand;APS Division, Department of Pure and Applied Physics, Queen's University, University Road, Belfast BT7 8NQ;Center for Astrophysics and Space Sciences (CASS), University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0424, USA;Laboratoire d'Astrophysique, Observatoire de Grenoble, BP53, F-38041 Grenoble, Cedex 9, France;Department of Physics and Astronomy, Vanderbilt University, 1807 Station B, Nashville, TN 37235, USA;Louisiana State University, Department of Physics and Astronomy, 202 Nicholson Hall, Tower Drive, Baton Rouge, LA 70803-4001, USA;Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX;Leiden Observatory, PO Box 9513, NL-2300 RA Leiden, the Netherlands;School of Mathematical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS |
| 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 r '− i ' 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+0.09−0.00 R J . Three candidates remain that require follow-up observations in order to determine their nature. |
