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

D.J. Pinfield, M. Gromadzki, S.K. Leggett, J. Gomes, N. Lodieu, R. Kurtev, A. C. Day-Jones, M. T. Ruiz, N. J. Cook, C.V. Morley, M. S. Marley, F. Marocco, R.L. Smart, H.R.A. Jones, P.W. Lucas, Y. Beletsky, V. D. Ivanov, B. Burningham, J. S. Jenkins, C. CardosoJ. Frith, J. R. A. Clarke, M. C. Gálvez-Ortiz, Z. Zhang

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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.
Original languageEnglish
Article numberstu1540
Pages (from-to)1931-1939
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Early online date4 Sept 2014
Publication statusPublished - 21 Oct 2014


  • Brown dwarfs
  • Stars: Low-mass
  • Surveys


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