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A fast hybrid algorithm for exoplanetary transit searches

Collier Cameron, A. ; Pollacco, D. ; Street, R. A. ; Lister, T. A. ; West, R. G. ; Wilson, D. M. ; Pont, F. ; Christian, D. J. ; Clarkson, W. I. ; Enoch, B. ; Evans, A. ; Fitzsimmons, A. ; Haswell, C. A. ; Hellier, C. ; Hodgkin, S. T. ; Horne, K. ; Irwin, J. ; Kane, S. R. ; Keenan, F. P. ; Norton, A. J. ; Parley, N. R. ; Osborne, J. ; Ryans, R. ; Skillen, I. ; Wheatley, P. J.

In: Monthly Notices of the Royal Astronomical Society, 2006, vol. 373, no. 2, p. 799-810

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    Titel
    • A fast hybrid algorithm for exoplanetary transit searches
    Autor
    • Collier Cameron, A.. School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS
    • Pollacco, D.. Astrophysics Research Centre, Main Physics Building, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN
    • Street, R. A.. Astrophysics Research Centre, Main Physics Building, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN
    • Lister, T. A.. School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS
    • West, R. G.. Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH
    • Wilson, D. M.. Astrophysics Group, School of Physical and Geographical Sciences, Lennard-Jones Laboratories, Keele University, Staffordshire ST5 5BG
    • Pont, F.. Observatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
    • Christian, D. J.. Astrophysics Research Centre, Main Physics Building, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN
    • Clarkson, W. I.. Department of Physics and Astronomy, The Open University, Milton Keynes MK7 6AA
    • Enoch, B.. Department of Physics and Astronomy, The Open University, Milton Keynes MK7 6AA
    • Evans, A.. Astrophysics Group, School of Physical and Geographical Sciences, Lennard-Jones Laboratories, Keele University, Staffordshire ST5 5BG
    • Fitzsimmons, A.. Astrophysics Research Centre, Main Physics Building, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN
    • Haswell, C. A.. Department of Physics and Astronomy, The Open University, Milton Keynes MK7 6AA
    • Hellier, C.. Astrophysics Group, School of Physical and Geographical Sciences, Lennard-Jones Laboratories, Keele University, Staffordshire ST5 5BG
    • Hodgkin, S. T.. Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA
    • Horne, K.. School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS
    • Irwin, J.. Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA
    • Kane, S. R.. Department of Astronomy, University of Florida, 211 Bryant Space Science Centre, Gainesville, FL 32611-2055, USA
    • Keenan, F. P.. Astrophysics Research Centre, Main Physics Building, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN
    • Norton, A. J.. Department of Physics and Astronomy, The Open University, Milton Keynes MK7 6AA
    • Parley, N. R.. Department of Physics and Astronomy, The Open University, Milton Keynes MK7 6AA
    • Osborne, J.. Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH
    • Ryans, R.. Astrophysics Research Centre, Main Physics Building, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN
    • Skillen, I.. Isaac Newton Group of Telescopes, Apartado de correos 321, E-38700 Santa Cruz de la Palma, Tenerife, Spain
    • Wheatley, P. J.. Department of Physics, University of Warwick, Coventry CV4 7AL
    Dokumententyp
    • Postprint
    Sprache
    • Englisch
    Veröffentlicht in
    • Monthly Notices of the Royal Astronomical Society, 2006, vol. 373, no. 2, p. 799-810. Blackwell Publishing Ltd
    Andere elektronische Ausgabe
    OAI-PMH-ID
    • oai:doc.rero.ch:302336
    Summary
    We present a fast and efficient hybrid algorithm for selecting exoplanetary candidates from wide-field transit surveys. Our method is based on the widely used SysRem and Box Least-Squares (BLS) algorithms. Patterns of systematic error that are common to all stars on the frame are mapped and eliminated using the SysRem algorithm. The remaining systematic errors caused by spatially localized flat-fielding and other errors are quantified using a boxcar-smoothing method. We show that the dimensions of the search-parameter space can be reduced greatly by carrying out an initial BLS search on a coarse grid of reduced dimensions, followed by Newton-Raphson refinement of the transit parameters in the vicinity of the most significant solutions. We illustrate the method's operation by applying it to data from one field of the SuperWASP survey, comprising 2300 observations of 7840 stars brighter than V= 13.0. We identify 11 likely transit candidates. We reject stars that exhibit significant ellipsoidal variations caused indicative of a stellar-mass companion. We use colours and proper motions from the Two Micron All Sky Survey and USNO-B1.0 surveys to estimate the stellar parameters and the companion radius. We find that two stars showing unambiguous transit signals pass all these tests, and so qualify for detailed high-resolution spectroscopic follow-up