The Earth 2.0 space mission for detecting Earth-like planets around solar type stars

Jian Ge; Hui Zhang; Yongshuai Zhang; Yan Li; Dan Zhou; Zhenghong Tang; Congcong Zhang; Chaoyan Wang; Yong Yu; Xinyu Yao; Jiapeng Zhu; Wen Chen; Xingbo Han; Kun Chen; Yingquan Yang; Xingzi Bi; Kuoxiang Zhang; Yonghe Chen; Xiaohua Liu; Dayi Yin; Quan Zhang; Baoyu Yang; Chuanxin Wei; Yuji Zhu; Zongxi Song; Wei Gao; Wei Li; Fengtao Wang; Pengfei Cheng; Chao Shen; Yue Pan; Hongfei Zhang; Jian Wang; Hui Wang; Cheng Chen; Jun Zhang; Zhiyue Wang; Weicheng Zang; Shude Mao; Wei Zhu; Sharon Xuesong Wang; Jiwei Xie; Chaofeng Jiang; Dichang Chen; Wei Tang; Mengfei Sun; Mutian Wang; Yanqin Wu; Yudong Li; Lin Wen; Jie Feng; Kevin Willis; Chelsea Huang; Bo Ma; Yonghao Wang; Rongfeng Shen; Pak-Hin Thomas Tam; Zhecheng Hu; Yanlv Yang; Fabo Feng; Maosheng Xiang; Jie Yu; Jinghua Zhang; Yaqian Wu; Weikai Zong; Haibo Yuan; Tanda Li; Yinan Zhao; Yuanchuan Zou; Hongping Deng; Beibei Liuu; Qing-zhu Yin

doi:10.1117/12.2630656

27 August 2022 The Earth 2.0 space mission for detecting Earth-like planets around solar type stars

Jian Ge, Hui Zhang, Yongshuai Zhang, Yan Li, Dan Zhou, Zhenghong Tang, Congcong Zhang, Chaoyan Wang, Yong Yu, Xinyu Yao, Jiapeng Zhu, Wen Chen, Xingbo Han, Kun Chen, Yingquan Yang, Xingzi Bi, Kuoxiang Zhang, Yonghe Chen, Xiaohua Liu, Dayi Yin, Quan Zhang, Baoyu Yang, Chuanxin Wei, Yuji Zhu, Zongxi Song, Wei Gao, Wei Li, Fengtao Wang, Pengfei Cheng, Chao Shen, Yue Pan, Hongfei Zhang, Jian Wang, Hui Wang, Cheng Chen, Jun Zhang, Zhiyue Wang, Weicheng Zang, Shude Mao, Wei Zhu, Sharon Xuesong Wang, Jiwei Xie, Chaofeng Jiang, Dichang Chen, Wei Tang, Mengfei Sun, Mutian Wang, Yanqin Wu, Yudong Li, Lin Wen, Jie Feng, Kevin Willis, Chelsea Huang, Bo Ma, Yonghao Wang, Rongfeng Shen, Pak-Hin Thomas Tam, Zhecheng Hu, Yanlv Yang, Fabo Feng, Maosheng Xiang, Jie Yu, Jinghua Zhang, Yaqian Wu, Weikai Zong, Haibo Yuan, Tanda Li, Yinan Zhao, Yuanchuan Zou, Hongping Deng, Beibei Liuu, Qing-zhu Yin

Author Affiliations +

Proceedings Volume 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave; 1218015 (2022) https://doi.org/10.1117/12.2630656
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

A space mission called “Earth 2.0 (ET)” is being developed in China to address a few of fundamental questions in the exoplanet field: How frequently habitable Earth-like planets orbit solar type stars (Earth 2.0s)? How do terrestrial planets form and evolve? Where did floating planets come from? ET consists of six 30 cm diameter transit telescope systems with each field of view of 500 square degrees and one 35 cm diameter microlensing telescope with a field of view of 4 square degrees. The ET transit mode will monitor ~1.2M FGKM dwarfs in the original Kepler field and its neighboring fields continuously for four years while the microlensing mode monitors over 30M I< 20.6 stars in the Galactic bulge direction. ET will merge its photometry data with that from Kepler to increase the time baseline to 8 years. This enhances the transit signal-to-noise ratio, reduce false positives, and greatly increases the chance to discover Earth 2.0s. Simulations show that ET transit telescopes will be able to identify ~17 Earth 2.0s, about 4,900 Earth-sized terrestrial planets and about 29,000 new planets. In addition, ET will detect about 2,000 transit-timingvariation (TTV) planets and 700 of them will have mass and eccentricity measurements. The ET microlensing telescope will be able to identify over 1,000 microlensing planets. With simultaneous observations with the ground-based KMTNet telescopes, ET will be able to measure masses of over 300 microlensing planets and determine the mass distribution functions of free-floating planets and cold planets. ET will be operated at the Earth-Sun L2 orbit with a designed lifetime longer than 4 years.

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Jian Ge, Hui Zhang, Yongshuai Zhang, Yan Li, Dan Zhou, Zhenghong Tang, Congcong Zhang, Chaoyan Wang, Yong Yu, Xinyu Yao, Jiapeng Zhu, Wen Chen, Xingbo Han, Kun Chen, Yingquan Yang, Xingzi Bi, Kuoxiang Zhang, Yonghe Chen, Xiaohua Liu, Dayi Yin, Quan Zhang, Baoyu Yang, Chuanxin Wei, Yuji Zhu, Zongxi Song, Wei Gao, Wei Li, Fengtao Wang, Pengfei Cheng, Chao Shen, Yue Pan, Hongfei Zhang, Jian Wang, Hui Wang, Cheng Chen, Jun Zhang, Zhiyue Wang, Weicheng Zang, Shude Mao, Wei Zhu, Sharon Xuesong Wang, Jiwei Xie, Chaofeng Jiang, Dichang Chen, Wei Tang, Mengfei Sun, Mutian Wang, Yanqin Wu, Yudong Li, Lin Wen, Jie Feng, Kevin Willis, Chelsea Huang, Bo Ma, Yonghao Wang, Rongfeng Shen, Pak-Hin Thomas Tam, Zhecheng Hu, Yanlv Yang, Fabo Feng, Maosheng Xiang, Jie Yu, Jinghua Zhang, Yaqian Wu, Weikai Zong, Haibo Yuan, Tanda Li, Yinan Zhao, Yuanchuan Zou, Hongping Deng, Beibei Liuu, and Qing-zhu Yin "The Earth 2.0 space mission for detecting Earth-like planets around solar type stars", Proc. SPIE 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave, 1218015 (27 August 2022); https://doi.org/10.1117/12.2630656

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