  Transiting extrasolar planets constitute only a small fraction of the range
of stellar systems found to display periodic, shallow dimmings in wide-field
surveys employing small-aperture camera arrays. Here we present an efficient
selection strategy for follow-up observations, derived from analysis of the
light curves of a sample of 67 SuperWASP targets that passed the selection
tests we used in earlier papers, but which have subsequently been identified
either as planet hosts or as astrophysical false positives. We determine the
system parameters using Markov-chain Monte Carlo analysis of the SuperWASP
light curves. We use a constrained optimisation of chi-squared combined with a
Bayesian prior based on the main-sequence mass and radius expected from the
2MASS J-H colour. The Bayesian nature of the analysis allows us to quantify
both the departure of the host star from the main-sequence mass-radius relation
and the probability that the companion radius is less than 1.5 Jupiter radii.
When augmented by direct light curve analyses that detect binaries with unequal
primary and secondary eclipses, and objects with aperture blends that are
resolved by SuperWASP, we find that only 13 of the original 67 stars, including
the three known planets in the sample, would qualify for follow-up. This
suggests that planet discovery "hit rates" better than one-in-five should be
achievable. In addition, the stellar binaries that qualify are likely to have
astrophysically interesting stellar or sub-stellar secondaries.
