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.