论文标题
Trappist Ultra-Cool Dwarf Transit调查的全球分析
Global Analysis of the TRAPPIST Ultra-Cool Dwarf Transit Survey
论文作者
论文摘要
我们对Trappist Ultra-Cool Dwarf Transit调查进行了全球分析 - 从2011年到2017年，智利的Trappist-South机器人望远镜进行了Speculoos Transit搜索的原型，以估计诸如Trappist-1B Orbiting Ultra-Cool-Cool-Cool-Cool-Cool-Cool-Cool-cool诸如近距离行星的发生率。为此，从原始图像开始，以自谐和全自动的方式重新列出了40个附近超酷矮人的光度数据。专门为此任务开发的管道会产生差异光曲线，去除非月份的光度特征和出色的变异性以及搜索过渡。它可以确定trappist-1b和trappist-1c的过渡，而无需任何人类干预。为了测试管道和类似调查的潜在输出，我们以星级的基础将行星转移到光曲线中，并测试了管道是否能够检测到它们。所达到的光度精度使我们能够识别出通过注射测试证实的绕着超冷矮的地球大小的行星。我们的行星注射模拟进一步表明，类似于Trappist-1b的行星的发生率的下限为10％，半径为1至1.3 $ r_ \ oplus $，轨道周期在1.4天到1.4天之间。
We conducted a global analysis of the TRAPPIST Ultra-Cool Dwarf Transit Survey - a prototype of the SPECULOOS transit search conducted with the TRAPPIST-South robotic telescope in Chile from 2011 to 2017 - to estimate the occurrence rate of close-in planets such as TRAPPIST-1b orbiting ultra-cool dwarfs. For this purpose, the photometric data of 40 nearby ultra-cool dwarfs were reanalysed in a self-consistent and fully automated manner starting from the raw images. The pipeline developed specifically for this task generates differential light curves, removes non-planetary photometric features and stellar variability, and searches for transits. It identifies the transits of TRAPPIST-1b and TRAPPIST-1c without any human intervention. To test the pipeline and the potential output of similar surveys, we injected planetary transits into the light curves on a star-by-star basis and tested whether the pipeline is able to detect them. The achieved photometric precision enables us to identify Earth-sized planets orbiting ultra-cool dwarfs as validated by the injection tests. Our planet-injection simulation further suggests a lower limit of 10 per cent on the occurrence rate of planets similar to TRAPPIST-1b with a radius between 1 and 1.3 $R_\oplus$ and the orbital period between 1.4 and 1.8 days.
