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        Searching for transits in the Wide Field Camera Transit Survey with difference-imaging light curves

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        Author
        Zendejas Dominguez, J.
        Koppenhoefer, J.
        Saglia, R.P.
        Birkby, J. L.
        Hodgkin, S.T.
        Kovács, G.
        Pinfield, D.J.
        Sipocz, B.
        Barrado, D.
        Bender, R.
        Del Burgo, C.
        Cappetta, M.
        Martín, E. L.
        Nefs, S. V.
        Riffeser, A.
        Steele, P.
        Attention
        2299/14504
        Abstract
        The Wide Field Camera Transit Survey is a pioneer program aiming at for searching extra-solar planets in the near-infrared. The images from the survey are processed by a data reduction pipeline, which uses aperture photometry to construct the light curves. We produce an alternative set of light curves using the difference-imaging method for the most complete field in the survey and carry out a quantitative comparison between the photometric precision achieved with both methods. The results show that differencephotometry light curves present an important improvement for stars with J > 16. We report an implementation on the box-fitting transit detection algorithm, which performs a trapezoid-fit to the folded light curve, providing more accurate results than the boxfitting model. We describe and optimize a set of selection criteria to search for transit candidates, including the V-shape parameter calculated by our detection algorithm. The optimized selection criteria are applied to the aperture photometry and difference-imaging light curves, resulting in the automatic detection of the best 200 transit candidates from a sample of ~475 000 sources. We carry out a detailed analysis in the 18 best detections and classify them as transiting planet and eclipsing binary candidates. We present one planet candidate orbiting a late G-type star. No planet candidate around M-stars has been found, confirming the null detection hypothesis and upper limits on the occurrence rate of short-period giant planets around M-dwarfs presented in a prior study. We extend the search for transiting planets to stars with J ≤ 18, which enables us to set a stricter upper limit of 1.1%. Furthermore, we present the detection of five faint extremely-short period eclipsing binaries and three M-dwarf/M-dwarf binary candidates. The detections demonstrate the benefits of using the difference-imaging light curves, especially when going to fainter magnitudes.
        Publication date
        2013-12
        Published in
        Astronomy and Astrophysics
        Published version
        https://doi.org/10.1051/0004-6361/201321317
        Other links
        http://hdl.handle.net/2299/14504
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