Closeby Habitable Exoplanet Survey (CHES): an  Astrometry Mission for Probing Nearby Habitable Planets

JI Jianghui; LI Haitao; ZHANG Junbo; LI Dong; FANG Liang; WANG Su; DENG Lei; CHEN Guo; LI Fei; DONG Yao; LI Baoquan; GAO Xiaodong; XIAN Hao

doi:10.11728/cjss2024.02.yg03

Volume 44 Issue 2

Apr. 2024

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Article Navigation > Chinese Journal of Space Science > 2024 > 44(2): 193-214 Open Access

JI Jianghui, LI Haitao, ZHANG Junbo, LI Dong, FANG Liang, WANG Su, DENG Lei, CHEN Guo, LI Fei, DONG Yao, LI Baoquan, GAO Xiaodong, XIAN Hao. Closeby Habitable Exoplanet Survey (CHES): an Astrometry Mission for Probing Nearby Habitable Planets (in Chinese). Chinese Journal of Space Science, 2024, 44(2): 193-214 doi: 10.11728/cjss2024.02.yg03

Citation:

JI Jianghui, LI Haitao, ZHANG Junbo, LI Dong, FANG Liang, WANG Su, DENG Lei, CHEN Guo, LI Fei, DONG Yao, LI Baoquan, GAO Xiaodong, XIAN Hao. Closeby Habitable Exoplanet Survey (CHES): an Astrometry Mission for Probing Nearby Habitable Planets (in Chinese). Chinese Journal of Space Science, 2024, 44(2): 193-214 doi: 10.11728/cjss2024.02.yg03

Citation:

JI Jianghui, LI Haitao, ZHANG Junbo, LI Dong, FANG Liang, WANG Su, DENG Lei, CHEN Guo, LI Fei, DONG Yao, LI Baoquan, GAO Xiaodong, XIAN Hao. Closeby Habitable Exoplanet Survey (CHES): an Astrometry Mission for Probing Nearby Habitable Planets (in Chinese). Chinese Journal of Space Science, 2024, 44(2): 193-214 doi: 10.11728/cjss2024.02.yg03

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Closeby Habitable Exoplanet Survey (CHES): an Astrometry Mission for Probing Nearby Habitable Planets

doi: 10.11728/cjss2024.02.yg03 cstr: 32142.14.cjss2024.02.yg03

JI Jianghui^{1, 2, 3
,},
LI Haitao^{4, 5},
ZHANG Junbo^{6, 7},
LI Dong⁸,
FANG Liang⁶,
WANG Su^{1, 2, 3},
DENG Lei⁸,
CHEN Guo^{1, 2, 3},
LI Fei⁸,
DONG Yao^{1, 3},
LI Baoquan^{4, 5},
GAO Xiaodong⁶,
XIAN Hao^{5, 6, 7}

1.
Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023
2.
School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026
3.
Key Laboratory of Planetary Sciences, Chinese Academy of Sciences, Nanjing 210023
4.
National Space Science Center, Chinese Academy of Sciences, Beijing 100190
5.
University of Chinese Academy of Sciences, Beijing 100049
6.
Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209
7.
National Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209
8.
Innovation Academy for Microsatellites, Chinese Academy of Sciences, Shanghai 201306

Received Date: 2024-01-01
Rev Recd Date: 2024-03-03

Available Online: 2024-04-08

Abstract

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 pioneering 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 inaugural 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 coaxial three-mirror TMA optical imaging system. Impressively, CHES is designed with a positioning measurement 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 exciting prospect of revealing 50 Earth-like planets. This announces a significant leap forward in China’s space science exploration technology.
- High-precision astrometry method,
- Exoplanets,
- Nearby Habitable Planets

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References(95)

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