A STUDY OF THE DIVERSE T DWARF POPULATION REVEALED BY WISE
A STUDY OF THE DIVERSE T DWARF POPULATION REVEALED BY WISE
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WISE 揭示的对不同 T 矮人种群的研究
DOI：
10.1088/0067-0049/205/1/6
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
N. Stock
中科院分区：
文献类型：
--
作者：
G. Mace;J. Davy Kirkpatrick;M. Cushing;C. Gelino;R. Griffith;M. Skrutskie;K. Marsh;E. Wright;P. Eisenhardt;I. McLean;M. Thompson;Katholeen Mix;V. Bailey;C. Beichman;J. Bloom;A. Burgasser;J. Fortney;P. Hinz;R. Knox;P. Lowrance;M. Marley;C. Morley;T. Rodigas;D. Saumon;S. Sheppard;N. Stock
本文报道了用广域红外巡天探测器(WISE)发现的87颗新的T型矮星和3颗兼具L矮星和T型矮星特征的红外线棕矮星。其中两颗新的T矮星可能是具有L7±1初级恒星和中间型T次级恒星的双星。此外，我们的后续计划已经确认了文献中先前发现的10颗T型矮星和4颗光度选择的L和T型矮星候选恒星。这个样本，连同之前WISE的发现，使已知的光谱类型晚于T5的棕矮星的数量增加了三倍。使用WISE全天空源星表，我们为所有被WISE发现的T和Y矮星提供了更新的颜色-颜色和颜色类型图。给出了新发现的近红外光谱和光谱分类。为了适应后来的T矮星，我们修改了确定光谱指数的积分通量法，改为使用中值通量。此外，一个新定义的J窄指数根据J带连续谱斜率来区分早期Y矮星和晚期T矮星。这一扩展样本的K/J指数表明，32%的晚期T型矮星K波段通量受到抑制，相对于光谱标准是蓝色的，而只有11%的矮星比标准光谱更红。Y/J和K/J指数与模式的比较表明，不同的大气条件支持了L/T转换后云重新出现的可能性。我们还讨论了特殊的棕矮星和被发现不是恒星下的候选恒星，包括两个年轻的恒星物体和两个活跃的星系核。已知的晚型T型矮星数量的大幅增加提供了一个群体，将用于测试冷大气和恒星形成的模型。最酷的、明智地发现的褐矮星是同类中最接近的，在未来许多年里仍将是同类中唯一的样本。
We report the discovery of 87 new T dwarfs uncovered with the Wide-field Infrared Survey Explorer (WISE) and 3 brown dwarfs with extremely red near-infrared colors that exhibit characteristics of both L and T dwarfs. Two of the new T dwarfs are likely binaries with L7 ± 1 primaries and mid-type T secondaries. In addition, our follow-up program has confirmed 10 previously identified T dwarfs and 4 photometrically selected L and T dwarf candidates in the literature. This sample, along with the previous WISE discoveries, triples the number of known brown dwarfs with spectral types later than T5. Using the WISE All-Sky Source Catalog we present updated color–color and color-type diagrams for all the WISE-discovered T and Y dwarfs. Near-infrared spectra of the new discoveries are presented along with spectral classifications. To accommodate later T dwarfs we have modified the integrated flux method of determining spectral indices to instead use the median flux. Furthermore, a newly defined J-narrow index differentiates the early-type Y dwarfs from late-type T dwarfs based on the J-band continuum slope. The K/J indices for this expanded sample show that 32% of late-type T dwarfs have suppressed K-band flux and are blue relative to the spectral standards, while only 11% are redder than the standards. Comparison of the Y/J and K/J index to models suggests diverse atmospheric conditions and supports the possible re-emergence of clouds after the L/T transition. We also discuss peculiar brown dwarfs and candidates that were found not to be substellar, including two young stellar objects and two active galactic nuclei. The substantial increase in the number of known late-type T dwarfs provides a population that will be used to test models of cold atmospheres and star formation. The coolest WISE-discovered brown dwarfs are the closest of their type and will remain the only sample of their kind for many years to come.
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
影响因子：
4.9
作者：
Eisenhardt, Peter R. M.;Wu, Jingwen;Yan, Lin
通讯作者：
Yan, Lin