University of Hertfordshire

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From the same journal

By the same authors

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

Research output: Contribution to journalArticlepeer-review


  • 907135

    Accepted author manuscript, 2.08 MB, PDF document

  • 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
  • Y. Beletsky
  • V. D. Ivanov
  • J. S. Jenkins
  • C. Cardoso
  • J. Frith
  • J. R. A. Clarke
  • M. C. Gálvez-Ortiz
  • Z. Zhang
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Original languageEnglish
Article numberstu1540
Pages (from-to)1931-1939
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Early online date4 Sep 2014
Publication statusPublished - 21 Oct 2014


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.


This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record [D. J. Pinfield, et al, Discovery of a new Y dwarf: WISE J030449.03−270508.3, MNRAS, Vol. 444 (2): 1931-1939, September 2014] is available online at:


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