巨行星星族的外界与6pc巡天
The Outer Cut-Off of the Giant Planet Population and the 6pc-Survey
摘要：
我们展示了两次高对比度成像调查的结果，这些调查利用了一种新技术，即L波段角差分成像。我们的第一次调查针对Beta Pic和Tuc-Hor移动群中的21颗年轻恒星，VLT/NACO达到20 AU的典型灵敏度<1 MJup at r >。对空值结果的统计分析表明，巨行星种群被截断在30 AU或更少（90%置信水平）。我们的第二个，正在进行的MMT/Clio调查利用独特的灵敏度在L波段实现的老行星探测所有M-矮星在6 pc。这些目标的接近使得首次能够直接成像像木星这样的轨道上的行星-这是直接成像巨行星的关键一步。
英文摘要：
We present results from two high-contrast imaging surveys that exploit a novel technique, L-band angular differential imaging. Our first survey targeted 21 young stars in the Beta Pic and Tuc-Hor moving groups with VLT/NACO reaching typical sensitivities of <1 MJup at r > 20 AU. The statistical analysis of the null result demonstrates that the giant planet population is truncated at 30 AU or less (90% confidence level). Our second, on-going MMT/Clio survey utilizes the unique sensitivity achieved in the L-band for old planets to probe all M-dwarf stars within 6 pc. The proximity of these targets enables direct imaging of planets in orbits like Jupiter for the first time - a key step for directly imaging giant planets.
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