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Title:
Efficient identification of exoplanetary transit candidates from SuperWASP light curves
Authors:
Collier Cameron, A.; Wilson, D. M.; West, R. G.; Hebb, L.; Wang, X.-B.; Aigrain, S.; Bouchy, F.; Christian, D. J.; Clarkson, W. I.; Enoch, B.; Esposito, M.; Guenther, E.; Haswell, C. A.; Hébrard, G.; Hellier, C.; Horne, K.; Irwin, J.; Kane, S. R.; Loeillet, B.; Lister, T. A.; Maxted, P.; Mayor, M.; Moutou, C.; Parley, N.; Pollacco, D.; Pont, F.; Queloz, D.; Ryans, R.; Skillen, I.; Street, R. A.; Udry, S.; Wheatley, P. J.
Affiliation:
AA(School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS), AB(Astrophysics Group, Keele University, Staffordshire ST5 5BG), AC(Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), AD(School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS), AE(School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS; National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming, China), AF(School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL), AG(Institut d'Astrophysique de Paris, CNRS (UMR 7095) - Université Pierre & Marie Curie, 98bis bvd Arago, 75014 Paris, France), AH(ARC, Main Physics Building, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN), AI(STScI, 3700 San Martin Drive, Baltimore, MD 21218, USA), AJ(Department of Physics and Astronomy, The Open University, Milton Keynes MK7 6AA), AK(Thüringer Landessternwarte Tautenburg, Karl-Schwarzschild-Observatorium, D-07778 Tautenburg, Germany), AL(Thüringer Landessternwarte Tautenburg, Karl-Schwarzschild-Observatorium, D-07778 Tautenburg, Germany), AM(Department of Physics and Astronomy, The Open University, Milton Keynes MK7 6AA), AN(Institut d'Astrophysique de Paris, CNRS (UMR 7095) - Université Pierre & Marie Curie, 98bis bvd Arago, 75014 Paris, France), AO(Astrophysics Group, Keele University, Staffordshire ST5 5BG), AP(School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS), AQ(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA), AR(Department of Astronomy, University of Florida, 211 Bryant Space Science Center, Gainesville, FL 32611-2055, USA), AS(Laboratoire d'Astrophysique de Marseille, BP 8, 13376 Marseille Cedex 12, France), AT(Astrophysics Group, Keele University, Staffordshire ST5 5BG; Las Cumbres Observatory, 6740B Cortona Drive, Goleta, CA 93117, USA), AU(Astrophysics Group, Keele University, Staffordshire ST5 5BG), AV(Observatoire de Genève, Université de Genève, 51 Ch des Maillettes, 1290 Sauverny, Switzerland), AW(Laboratoire d'Astrophysique de Marseille, BP 8, 13376 Marseille Cedex 12, France), AX(Department of Physics and Astronomy, The Open University, Milton Keynes MK7 6AA), AY(ARC, Main Physics Building, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN), AZ(Observatoire de Genève, Université de Genève, 51 Ch des Maillettes, 1290 Sauverny, Switzerland), BA(Observatoire de Genève, Université de Genève, 51 Ch des Maillettes, 1290 Sauverny, Switzerland), BB(ARC, Main Physics Building, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN), BC(Isaac Newton Group of Telescopes, Apartado de Correos 321, E-38700 Santa Cruz de la Palma, Tenerife, Spain), BD(), BE(Observatoire de Genève, Université de Genève, 51 Ch des Maillettes, 1290 Sauverny, Switzerland), BF(Department of Physics, University of Warwick, Coventry CV4 7AL)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 380, Issue 3, pp. 1230-1244. (MNRAS Homepage)
Publication Date:
09/2007
Origin:
MNRAS
MNRAS Keywords:
methods: data analysis , techniques: photometric , planetary systems
Abstract Copyright:
(c) 2007 The Authors. Journal compilation © 2007 RAS
DOI:
10.1111/j.1365-2966.2007.12195.x
Bibliographic Code:
2007MNRAS.380.1230C

Abstract

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 optimization of χ2 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 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 substellar secondaries.
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