空间科学学报2024，Vol.44Issue(2)：193-214,22.DOI:10.11728/cjss2024.02.yg03
近邻宜居行星巡天计划:利用空间天体测量法寻找下一个"地球"
Closeby Habitable Exoplanet Survey(CHES):an Astrometry Mission for Probing Nearby Habitable Planets
摘要
Abstract
The Closeby Habitable Exoplanet Survey(CHES)employs state-of-the-art,high-precision astrometry and positioning technology at the microarcsecond level in space.Its primary objective is to conduct a thorough survey of approximately 100 FGK-type stars within the Sun's proximity(within 10 parsecs),with the goal of detecting potentially habitable Earth-like planets or super-Earths.This pio-neering mission involves a detailed census of habitable planets,providing intricate information on their numbers,true masses,and three-dimensional orbits.Notably,CHES marks a historic milestone as the in-augural international space exploration mission exclusively dedicated to the study of terrestrial planets within the nearby habitable zone.CHES's payload features a cutting-edge optical telescope with a 1.2 m aperture,a field of view measuring 0.44°×0.44°,and a focal length of 36 m.The telescope utilizes a coa xial three-mirror TMA optical imaging system.Impressively,CHES is designed with a positioning mea-surement accuracy of 1 μas,solidifying its status as the most precise space exploration project globally in terms of positioning accuracy.To achieve the detection objectives of CHES,it is essential to refine and further substantiate the scientific goals through comprehensive argumentation.Overcoming three key technological challenges is crucial:advancing optical systems for large field of view,developing high-quality space telescopes with minimal distortion;breaking through measurement technology for stellar separations at the 10-5 pixel level;and achieving high stability in satellite system attitude control and thermal control precision.CHES stands on the threshold of groundbreaking discoveries,with the excit-ing prospect of revealing 50 Earth-like planets.This announces a significant leap forward in China's space science exploration technology.关键词
高精度天体测量法/系外行星/近邻宜居行星Key words
High-precision astrometry method/Exoplanets/Nearby Habitable Planets分类
天文与地球科学引用本文复制引用
季江徽,董瑶,李保权,高晓东,鲜浩,李海涛,张俊波,李东,方亮,王素,邓雷,陈果,李飞..近邻宜居行星巡天计划:利用空间天体测量法寻找下一个"地球"[J].空间科学学报,2024,44(2):193-214,22.基金项目
中国科学院空间科学战略性先导科技专项(二期)背景型号项目(XDA15020800),国家自然科学基金项目(12033010,12073084,12150009)和紫金山天文台小行星基金会项目共同资助 （二期）
