The Closeby Habitable Exoplanet Survey (CHES) mission is proposed to discover habitable-zone Earth-like planets of nearby solar-type stars (～10 pc away from our solar system) via microarcsecond relative astrometry. The major scientific objectives of CHES are:to search for Earth Twins or terrestrial planets in habitable zones orbiting 100 FGK nearby stars;further to conduct a comprehensive survey and extensively characterize nearby planetary systems. The primary payload is a high-quality, low-distortion, high-stability telescope. The optical subsystem is a coaxial three-mirror anastigmat (TMA) with a 1.2 m-aperture, 0°. 44 × 0°. 44 field of view and 500 nm-900 nm working wave band. The camera focal plane is composed of a mosaic of 81 scientific CMOS detectors each with 4 k × 4 k pixels. The heterodyne laser interferometric calibration technology is employed to ensure microarcsecond level (1 μas) relative astrometry precision to meet the requirements for detection of Earth-like planets. The CHES satellite operates at the Sun-Earth L2 point and observes all the target stars for 5 yr. CHES will offer the first direct measurements of true masses and inclinations of Earth Twins and super-Earths orbiting our neighbor stars based on microarcsecond astrometry from space. This will definitely enhance our understanding of the formation of diverse nearby planetary systems and the emergence of other worlds for solar-type stars, and finally provide insights to the evolution of our own solar system.

Jiang-Hui Ji;Hai-Tao Li;Jun-Bo Zhang;Liang Fang;Dong Li;Su Wang;Yang Cao;Lei Deng;Bao-Quan Li;Hao Xian;Xiao-Dong Gao;Ang Zhang;Fei Li;Jia-Cheng Liu;Zhao-Xiang Qi;Sheng Jin;Ya-Ning Liu;Guo Chen;Ming-Tao Li;Yao Dong;Zi Zhu

CAS Key Laboratory of Planetary Sciences,Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China;School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026,China;Key Laboratory of Electronics and Information Technology for Space Systems,National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;Institute of Optics and Electronics,Chinese Academy of Sciences,Chengdu 610209,China;Key Laboratory on Adaptive Optics,Chinese Academy of Sciences,Chengdu 610209,China;Key Laboratory of Science and Technology on Space Optoelectronic Precision Measurement,Chinese Academy of Sciences,Chengdu 610209,China;Innovation Academy for Microsatellites of Chinese Academy of Sciences,Shanghai 201306,China;School of Astronomy and Space Science,Nanjing University,Nanjing 210046,China;Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China

天文和天体物理学研究

[1]Jiang-Hui Ji;Hai-Tao Li;Jun-Bo Zhang;Liang Fang;Dong Li;Su Wang;Yang Cao;Lei Deng;Bao-Quan Li;Hao Xian;Xiao-Dong Gao;Ang Zhang;Fei Li;Jia-Cheng Liu;Zhao-Xiang Qi;Sheng Jin;Ya-Ning Liu;Guo Chen;Ming-Tao Li;Yao Dong;Zi Zhu-.CHES:A Space-borne Astrometric Mission for the Detection of Habitable Planets of the Nearby Solar-type Stars)[J].天文和天体物理学研究,2022(07):32-59

Astrometric,Habitable,Planets,Closeby,Exoplanet,microarcsecond,astrometry,FGK,anastigmat

CHES,Space,borne,Mission,Detection,Nearby,Solar,type,Stars,Survey,mission,proposed,discover,habitable,like,planets,nearby,solar,stars,pc,away,from,our,via,relative,major,scientific,objectives,are,search,Twins,terrestrial,zones,orbiting,further,conduct,comprehensive,survey,extensively,characterize,planetary,systems,primary,payload,high,quality,low,distortion,stability,telescope,optical,subsystem,coaxial,three,mirror,TMA,aperture,field,view,working,wave,band,camera,focal,composed,mosaic,CMOS,detectors,each,pixels,heterodyne,laser,interferometric,calibration,technology,employed,ensure,level,precision,meet,requirements,detection,satellite,operates,Sun,L2,point,observes,target,yr,will,offer,first,direct,measurements,true,masses,inclinations,super,Earths,neighbor,space,This,definitely,enhance,understanding,formation,diverse,emergence,other,worlds,finally,provide,insights,evolution,own

0.546227