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        A method for selecting M dwarfs with an increased likelihood of unresolved ultracool companionship

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        1601.03402.pdf (PDF, 1Mb)
        Author
        Cook, Neil
        Pinfield, D.J.
        Marocco, F.
        Burningham, B.
        Jones, H.R.A.
        Frith, James
        Zhong, J.
        Luo, A.
        Qi, Z.
        Lucas, P.W.
        Gromadzki, Mariusz
        Day-Jones, Avril
        Kurtev, Radostin
        Guo, Y.
        Wang, Y.
        Bai, Y.
        Yi, Z.
        Smart, R.
        Attention
        2299/17133
        Abstract
        Locating ultracool companions to M dwarfs is important for constraining low-mass formation models, the measurement of substellar dynamical masses and radii, and for testing ultracool evolutionary models. We present an optimized method for identifying M dwarfs which may have unresolved ultracool companions. We construct a catalogue of 440 694 M dwarf candidates, from Wide-Field Infrared Survey Explorer, Two Micron All-Sky Survey and Sloan Digital Sky Survey, based on optical- and near-infrared colours and reduced proper motion. With strict reddening, photometric and quality constraints we isolate a subsample of 36 898 M dwarfs and search for possible mid-infrared M dwarf + ultracool dwarf candidates by comparing M dwarfs which have similar optical/near-infrared colours (chosen for their sensitivity to effective temperature and metallicity). We present 1082 M dwarf + ultracool dwarf candidates for follow-up. Using simulated ultracool dwarf companions to M dwarfs, we estimate that the occurrence of unresolved ultracool companions amongst our M dwarf + ultracool dwarf candidates should be at least four times the average for our full M dwarf catalogue. We discuss possible contamination and bias and predict yields of candidates based on our simulations.
        Publication date
        2016-04-01
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1093/mnras/stw061
        Other links
        http://hdl.handle.net/2299/17133
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