CHES: a space-borne astrometric mission for the detection of habitable planets of the nearby solar-type stars
In: Res. Astron. Astrophys., Volume 22, Number 7, article id. 072003 (2022); (2022)
Online
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The Closeby Habitable Exoplanet Survey (CHES) mission is proposed to discover habitable-zone Earth-like planets of the nearby solar-type stars ($\sim 10~\mathrm{pc}$ away from our solar system) via micro-arcsecond 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 the 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 $1.2 \mathrm{~m}$-aperture, $0.44^{\circ} \times 0.44^{\circ}$ field of view and $500 \mathrm{~nm}-900 \mathrm{~nm}$ working waveband. The camera focal plane is composed of 81 MOSAIC scientific CMOS detectors each with $4 \mathrm{~K} \times 4 \mathrm{~K}$ pixels. The heterodyne laser interferometric calibration technology is employed to ensure micro-arcsecond level (1 $\mu$as) relative astrometry precision to meet the requirements for detection of Earth-like planets. CHES satellite operates at the Sun-Earth L2 point and observes the entire target stars for 5 years. CHES will offer the first direct measurements of true masses and inclinations of Earth Twins and super-Earths orbiting our neighbor stars based on micro-arcsecond 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 to reflect the evolution of our own solar system.
Comment: 39 pages, 37 figures, Invited Review, accepted to Research in Astronomy and Astrophysics
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CHES: a space-borne astrometric mission for the detection of habitable planets of the nearby solar-type stars
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Autor/in / Beteiligte Person: | Ji, Jianghui ; Li, Haitao ; Zhang, Junbo ; Fang, Liang ; Li, Dong ; Wang, Su ; Cao, Yang ; Deng, Lei ; Li, Baoquan ; Xian, Hao ; Gao, Xiaodong ; Zhang, Ang ; Li, Fei ; Liu, Jiacheng ; Qi, Zhaoxiang ; Jin, Sheng ; Liu, Yaning ; Chen, Guo ; Li, Mingtao ; Dong, Yao ; Zhu, Zi ; consortium, CHES |
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Quelle: | Res. Astron. Astrophys., Volume 22, Number 7, article id. 072003 (2022); (2022) |
Veröffentlichung: | 2022 |
Medientyp: | report |
DOI: | 10.1088/1674-4527/ac77e4 |
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