arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.07278astro-ph.EPastro-ph.IMastro-ph.SR
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TRAPPIST超冷矮星Transit巡天的全球分析

Global Analysis of the TRAPPIST Ultra-Cool Dwarf Transit Survey

F. Lienhard, D. Queloz, M. Gillon, A. Burdanov, L. Delrez, E. Ducrot, W. Handley, E. Jehin, C. A. Murray, A. H. M. J. Triaud, E. Gillen, A. Mortier, B. V. Rackham

摘要:

我们对TRAPPIST超冷矮星过境调查进行了全球分析-这是2011年至2017年在智利使用TRAPPIST-South机器人望远镜进行的SPECULOOS过境搜索的原型-以估计近距离行星的发生率,如TRAPPIST-1b轨道超冷矮星。为此,从原始图像开始,以自洽和全自动的方式重新分析了附近40个超冷矮星的光度数据。专门为此任务开发的管道生成差分光变曲线,消除非行星光度特征和恒星变化,并搜索凌日。它识别TRAPPIST-1b和TRAPPIST-1c的过境,而无需任何人为干预。为了测试管道和类似调查的潜在输出,我们在逐星的基础上将行星凌日注入光变曲线,并测试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地球大小的行星,这些行星绕着超冷矮星运行,并通过注入测试进行了验证。我们的行星注入模拟进一步表明,半径在1至1.3 $R_\oplus$之间、轨道周期在1.4至1.8天之间的类似TRAPPIST-1b的行星出现率的下限为10%。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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