Discovery of a new Y dwarf: WISE J030449.03−270508.3
Discovery of a new Y dwarf: WISE J030449.03−270508.3
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发现新的 Y 矮星：WISE J030449.03−270508.3
DOI：
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Z. Zhang
中科院分区：
文献类型：
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作者：
D. Pinfield;M. Gromadzki;S. Leggett;J. Gomes;N. Lodieu;R. Kurtev;A. Day;M. Ruiz;N. Cook;C. Morley;M. Marley;F. Marocco;R. Smart;H. Jones;P. Lucas;Y. Beletsky;V. Ivanov;B. Burningham;J. Jenkins;C.Cardoso;J. Frith;J. Clarke;M. C. Gálvez;Z. Zhang
我们提出了一颗新的Y矮星WISE J030449.03-270508.3，它是从WISE数据库中挑选低温物体的候选样本中得到证实的。根据光谱标准的视觉比较，这颗新天体的类型为Y0pec，可能位于10-17个单位的距离。它的切向速度表明它是薄盘的成员，但它显示的一些光谱特征表明它可能是金属贫乏的，或者比以前发现的Y0矮星更古老。根据温暖的晚T型矮星的趋势，Y波段通量峰形态表明了亚太阳金属丰度，而j波段通量峰的增强红翼提供了高重力和/或低金属丰度的证据（相关模型趋势表明年龄接近- 10 Gyr，质量在0.02-0.03 M⊙之间）。因此，这个天体可能扩展了已知的Y0矮星的总体参数空间。
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 WISE database. 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 disk membership, but it shows some spectral characteristics that suggest it may be metalpoor 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 subsolar 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.
VISTA 半球巡天中的第一颗 T 矮星
影响因子：
6.5
作者：
Lodieu N
通讯作者：
Lodieu N
T6.5亚矮星的发现
影响因子：
4.8
作者：
Burningham B
通讯作者：
Burningham B