Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-12-14
Mon.Not.Roy.Astron.Soc.367:1677-1685,2006
Astronomy and Astrophysics
Astrophysics
Submitted to MNRAS (04/11/2005)
Scientific paper
10.1111/j.1365-2966.2006.10070.x
We describe a method of estimating the abundance of short-period extrasolar planets based on the results of a photometric survey for planetary transits. We apply the method to a 21-night survey with the 2.5m Isaac Newton Telescope of \~32000 stars in a ~0.5 deg by 0.5 deg square 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 lightcurve 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 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.
Bramich Daniel M.
Horne Keith
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