DENIS J081730 .0-615520：太阳附近被忽视的中T矮星
DENIS J081730.0-615520: An overlooked mid-T dwarf in the solar neighborhood
摘要：
最近的宽视场近红外巡天发现了大量的冷褐矮星，将温度序列扩展到低于500 K，并限制了光度函数的暗端。由光度函数导出的一个有趣的推论是，在太阳附近（<10 pc）的褐矮星普查仍然很大程度上是不完整的，一些明亮的（J<16）褐矮星仍然有待于在现有的调查中识别。这些天体特别令人感兴趣，因为它们是可以进行最详细研究的天体，特别是使用需要大通量的技术（例如时变、偏振测量、高分辨率光谱学），而这些技术实际上无法应用于深度勘测发现的天体。通过交叉匹配DENIS和2 MASS点源目录，我们已经确定了一个被忽视的棕矮星-DENIS J081730.0-615520-这是天空中最明亮的中T矮星（J = 13.6）。我们目前的天体测量学和光谱学的后续观测这颗褐矮星。我们的数据表明它的光谱类型为T6，视差测量的距离为4.9 \pm 0.3 pc，这颗中T矮星是离太阳最近的3颗孤立棕矮星之一。
英文摘要：
Recent wide-field near-infrared surveys have uncovered a large number of cool brown dwarfs, extending the temperature sequence down to less than 500 K and constraining the faint end of the luminosity function. One interesting implication of the derived luminosity function is that the brown dwarf census in the immediate (<10 pc) solar neighborhood is still largely incomplete, and some bright (J<16) brown dwarfs remain to be identified in existing surveys. These objects are especially interesting as they are the ones that can be studied in most detail, especially with techniques that require large fluxes (e.g. time-variability, polarimetry, high-resolution spectroscopy) that cannot realistically be applied to objects uncovered by deep surveys. By cross-matching the DENIS and the 2MASS point-source catalogs, we have identified an overlooked brown dwarf -DENIS J081730.0-615520- that is the brightest field mid-T dwarf in the sky (J = 13.6). We present astrometry and spectroscopy follow-up observations of this brown dwarf. Our data indicate a spectral type T6 and a distance -from parallax measurement- of 4.9\pm0.3 pc, placing this mid-T dwarf among the 3 closest isolated brown dwarfs to the Sun.
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