Details

Autor(en) / Beteiligte

• 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

Titel

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

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2014-10, Vol.444 (2), p.1931-1939

Ort / Verlag

London: Oxford University Press

Erscheinungsjahr

2014

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 M⊙). This object may thus be extending the population parameter space of the known Y0 dwarfs.