Efficient identification of exoplanetary transit candidates from SuperWASP light curves
By A. Cameron, D. Wilson, R. West, L. Hebb, Xiaobin Wang, Suzanne Aigrain, F. Bouchy, D. J. Christian, W. Clarkson, B. Enoch and 22 more. 2007
211 citations recorded by the source corpus.
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 A 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 optimization of X 2 combined with a Bayesian prior based on the main-sequence mass and radius expected from the Two Micron All Sky Survey 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 fight-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 substellar secondaries.
Subfields: Astronomy and Astrophysics, Instrumentation
View Paper: https://www.semanticscholar.org/paper/e247bd3afa98d78bce72c82950aff19d166aedea
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Astronomy and Astrophysics
In Instrumentation
Citations in the corpus
- A Gaussian process framework for modelling instrumental systematics: application to transmission spectroscopy (2011, methodology): “In practice this can be done using Monte-Carlo MarkovChains (MCMC) methods, which are widely used in the exoplanet community to explore the joint posterior probability distribution of multivariate models (see e.g. Collier Cameron et al. 2007; Holman et al. 2006; Winn et al. 2008).”
- The TESS Input Catalog and Candidate Target List (2017, methodology): “…RPM diagnostic (RPMJ≡J+5 log μ, where μ is the total proper motion in arcsec yr−1), adopting a slightly modified version of the boundary proposed by Collier Cameron et al. (2007) to differentiate among dwarfs ( glog 4.1), subgiants (3.0 glog <3.5 and Teff 5000; or 3.5 glog <4.1), and…”
- The Rossiter-McLaughlin effect of CoRoT-3b and HD 189733b (2009, methodology): “A. Triaud would like to acknowledge that he owes a beer to D. Queloz and two to A. Collier Cameron.”
- A Revised Exoplanet Yield from the Transiting Exoplanet Survey Satellite (TESS) (2018, background): “…stars on specially curated target lists (e.g., Muirhead et al. 2018), stars with reduced proper motions (RPMs) that indicate they are red giants (Collier Cameron et al. 2007), stars with a temperature below 5500 K and a TESS magnitude fainter than 12, or stars with temperature above 5500 K and…”
- Homogeneous studies of transiting extrasolar planets - III. Additional planets and stellar models (2010, methodology): “It was identified as a TEP by O’Donovan et al. (2007) and a discovery-quality light curve has also been obtained by the SuperWASP survey (Collier Cameron et al. 2007).”