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        Discovery of a new Y dwarf: WISE J030449.03-270508.3

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        Author
        Pinfield, D.J.
        Gromadzki, M.
        Leggett, S.K.
        Gomes, J.
        Lodieu, N.
        Kurtev, R.
        Day-Jones, A. C.
        Ruiz, M. T.
        Cook, N. J.
        Morley, C.V.
        Marley, M. S.
        Marocco, F.
        Smart, R.L.
        Jones, H.R.A.
        Lucas, P.W.
        Beletsky, Y.
        Ivanov, V. D.
        Burningham, B.
        Jenkins, J. S.
        Cardoso, C.
        Frith, J.
        Clarke, J. R. A.
        Gálvez-Ortiz, M. C.
        Zhang, Z.
        Attention
        2299/16337
        Abstract
        We present a new Y dwarf, WISE J030449.03−270508.3, confirmed from a candidate sample designed to pick out low-temperature objects from the Wide-field Infrared Survey Explorer (WISE) data base. The new object is typed Y0pec following a visual comparison with spectral standards, and lies at a likely distance of 10–17 pc. Its tangential velocity suggests thin disc membership, but it shows some spectral characteristics that suggest that it may be metal poor and/or older than previously identified Y0 dwarfs. Based on trends seen for warmer late-type T dwarfs, the Y-band flux peak morphology is indicative of sub-solar metallicity, and the enhanced red wing of the J-band flux peak offers evidence for high gravity and/or low metallicity (with associated model trends suggesting an age closer to ∼10 Gyr and mass in the range 0.02–0.03 Mȯ). This object may thus be extending the population parameter space of the known Y0 dwarfs.
        Publication date
        2014-10-21
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1093/mnras/stu1540
        Other links
        http://hdl.handle.net/2299/16337
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