论文标题
金牛座分子云中年轻恒星的行星同伴的高分辨率调查
High-resolution survey for planetary companions to young stars in the Taurus Molecular Cloud
论文作者
论文摘要
在大型望远镜的衍射极限处的红外成像是对年轻行星系统特性的独特探针。我们使用天然和激光指南自适应光学器件以及Keck II望远镜的近红外摄像头（NIRC2）调查了L'滤波器中金牛座的55级I类和II类星，以寻找行星群众。我们使用参考星差成像和内核相技术，在0.2“ 0.2”和〜8幅度的分离时达到典型的5 sigma对比度，超过0.5”。尽管我们没有检测到任何新的微弱伴侣，但我们限制了宽分离的巨大行星的频率，例如HR 8799类似物。我们发现，假设启动模型和具有幂律质量的行星分布和半肌轴指数分别为-0.5和-1，少于我们的目标恒星寄主行星的少于20％的质量在分离> 10 au处质量为2 mJ。
Direct imaging in the infrared at the diffraction limit of large telescopes is a unique probe of the properties of young planetary systems. We survey 55 single class I and class II stars in Taurus in the L' filter using natural and laser guide star adaptive optics and the near-infrared camera (NIRC2) of the Keck II telescope, in order to search for planetary mass companions. We use both reference star differential imaging and kernel phase techniques, achieving typical 5-sigma contrasts of ~6 magnitudes at separations of 0.2" and ~8 magnitudes beyond 0.5". Although we do not detect any new faint companions, we constrain the frequency of wide separation massive planets, such as HR 8799 analogues. We find that, assuming hot-start models and a planet distribution with power-law mass and semi-major axis indices of -0.5 and -1, respectively, less than 20% of our target stars host planets with masses >2 MJ at separations >10 AU.
