超冷棕矮星UGPS J072227 .51-054031.2的PDKEEPAAA光谱学：动能、旋转和大气参数
FIRE Spectroscopy of the ultra-cool brown dwarf, UGPS J072227.51-054031.2: Kinematics, Rotation and Atmospheric Parameters
摘要：
本文介绍了在坎帕纳斯天文台Baade Magellan望远镜上的折叠端口红外Echellette摄谱仪调试期间获得的T9矮星UGPS J072227.51-054031.2的λ/Δλ ~ 6000近红外光谱。该光谱以来自H2O、CH 4和H2的显著吸收为特征。我们还确定NH3吸收功能，通过比较光谱最近公布的线列表。光谱与BT-Settl模型拟合，表明Teff ~ 500-600 K和log g ~ 4.3-5.0。这对应于约10-30兆焦耳的质量和1-5 Gyr的年龄，但是模型和观测光谱之间存在很大的差异。棕矮星的径向速度和自转速度分别为46.9 \pm 2.5和40 \pm 10 km/s，反映了与其他T矮星类似的薄盘星系轨道和快速自转，表明这是一颗年轻的、可能有行星质量的棕矮星。
英文摘要：
We present λ/Δλ ~ 6000 near-infrared spectroscopy of the nearby T9 dwarf, UGPS J072227.51-054031.2, obtained during the commissioning of the Folded-Port Infrared Echellette Spectrograph on the Baade Magellan telescope at Las Campanas Observatory. The spectrum is marked by significant absorption from H2O, CH4 and H2. We also identify NH3 absorption features by comparing the spectrum to recently published line lists. The spectrum is fit with BT-Settl models, indicating Teff ~ 500-600 K and log g ~ 4.3-5.0. This corresponds to a mass of ~ 10-30 MJup and an age of 1-5 Gyr, however there are large discrepancies between the model and observed spectrum. The radial and rotational velocities of the brown dwarf are measured as 46.9 \pm 2.5 and 40 \pm 10 km/s, respectively, reflecting a thin disk Galactic orbit and fast rotation similar to other T dwarfs, suggesting a young, possibly planetary-mass brown dwarf.
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