Abstract
We present results from a search for additional transiting planets in 24 systems already known to contain a transiting planet. We model the transits due to the known planet in each system and subtract these models from light curves obtained with the SuperWASP (Wide Angle Search for Planets) survey instruments. These residual light curves are then searched for evidence of additional periodic transit events. Although we do not find any evidence for additional planets in any of the planetary systems studied, we are able to characterize our ability to find such planets by means of Monte Carlo simulations. Artificially generated transit signals corresponding to planets with a range of sizes and orbital periods were injected into the SuperWASP photometry and the resulting light curves searched for planets. As a result, the detection efficiency as a function of both the radius and orbital period of any second planet is calculated. We determine that there is a good (>50 per cent) chance of detecting additional, Saturn-sized planets in P∼ 10 d orbits around planet-hosting stars that have several seasons of SuperWASP photometry. Additionally, we confirm previous evidence of the rotational stellar variability of WASP-10, and refine the period of rotation. We find that the period of the rotation is 11.91 ± 0.05 d, and the false alarm probability for this period is extremely low (∼10−13).
Highlights
1.1 Multiple planet systems Of the 347 presently known extrasolar planets, 90 are known to reside within multiple planet systems.1 All of these systems, have been discovered by radial velocity measurements alone; none of them was discovered via the transit method, nor have any been later discovered to transit their host stars
The periodograms produced for each of the 24 stars were inspected for any strong peaks indicative of a genuine transit, and the phase-folded light curves were checked for transit-like signals
Our ability to detect additional planets in these other systems is very similar to that for WASP-1; there are variations in detection efficiency, but this correlates with the length of the original light curve
Summary
1.1 Multiple planet systems Of the 347 presently known extrasolar planets, 90 are known to reside within multiple planet systems. All of these systems, have been discovered by radial velocity measurements alone; none of them was discovered via the transit method, nor have any been later discovered to transit their host stars. Planets that transit their host stars allow us to measure fundamental properties such as the planetary radius and remove much of the uncertainty on the value of the planetary mass by constraining the orbital inclination angle. This is just as true for multiple planet systems, and further properties such as dynamical evolution timescales can be measured for transiting systems (Fabrycky 2009)
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