Science goals of the Earth 2.0 space mission

Hui Zhang; Jian Ge; Hongping Deng; Xinyu Yao; Jiapeng Zhu; Weicheng Zang; Shude Mao; Wei Zhu; Sharon Xuesong Wang; Jiwei Xie; Ming Yang; Chaofeng Jiang; Dichang Chen; Mutian Wang; Wei Tang; Mengfei Sun; Kevin Willis; Chelsea Huang; Bo Ma; Yonghao Wang; Rongfeng Shen; Pak-Hin Thomas Tam; Zhecheng Hu; Yanlv Yang; Fabo Feng; Beibei Liu; Quanzhi Ye; Maosheng Xiang; Jie Yu; Jinghua Zhang; Yaqian Wu; Weikai Zong; Haibo Yuan; Tanda Li; Yinan Zhao; Yuanchuan Zou; Jinzhong Liu

doi:10.1117/12.2630151

27 August 2022 Science goals of the Earth 2.0 space mission

Hui Zhang, Jian Ge, Hongping Deng, Xinyu Yao, Jiapeng Zhu, Weicheng Zang, Shude Mao, Wei Zhu, Sharon Xuesong Wang, Jiwei Xie, Ming Yang, Chaofeng Jiang, Dichang Chen, Mutian Wang, Wei Tang, Mengfei Sun, Kevin Willis, Chelsea Huang, Bo Ma, Yonghao Wang, Rongfeng Shen, Pak-Hin Thomas Tam, Zhecheng Hu, Yanlv Yang, Fabo Feng, Beibei Liu, Quanzhi Ye, Maosheng Xiang, Jie Yu, Jinghua Zhang, Yaqian Wu, Weikai Zong, Haibo Yuan, Tanda Li, Yinan Zhao, Yuanchuan Zou, Jinzhong Liu

Author Affiliations +

Proceedings Volume 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave; 1218016 (2022) https://doi.org/10.1117/12.2630151
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

An innovative Chinese space mission, the Earth 2.0 (ET) mission, is being developed to combine the transit and microlensing method together to search for Earth-sized exoplanets in the Galaxy, including the most precious ones—Earth 2.0s, i.e., habitable Earth-sized (0.8-1.25 Earth radii) planets orbiting solar type stars, cold and free-floating low-mass planets. ET’s 6 transit telescopes will monitor a FoV of 500 square degrees (covering the Kepler field) continuously for at least four years and generate a huge database containing high-cadence and ultra-high photometry precision light curves of 1.2 million FGKM dwarfs. With such a high value database in hand, many unsolved issues in the exoplanet field and even stellar sciences will be well addressed. Besides looking for Earth 2.0s and constraining its occurrence rate, ET will be dedicated to map a much wider radius-period diagram of terrestrial-like exoplanets than ever and reveal how it depends on the stellar properties and environments. With the 4-yr legacy data of Kepler, ET will observe some planet systems for up to 8 years and catch additional components in a multi-planet system, e.g. cold Giant, cold sub-Earths, exomoons, exorings and even exocomets. Are exomoons and exocomets common in a planet system? What’s the favorite number of planets in a multi-planet system? What’s the most common orbital configuration of planet systems? With these new data, ET will deepen our understandings on how unique our Solar system is and how do multi-planet systems evolve. In addition to exoplanet sciences, ET’s time series data will also benefit the studies in asteroseismology, archeology in the Galaxy, time-domain astrophysics and black hole science.

Conference Presentation

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Hui Zhang, Jian Ge, Hongping Deng, Xinyu Yao, Jiapeng Zhu, Weicheng Zang, Shude Mao, Wei Zhu, Sharon Xuesong Wang, Jiwei Xie, Ming Yang, Chaofeng Jiang, Dichang Chen, Mutian Wang, Wei Tang, Mengfei Sun, Kevin Willis, Chelsea Huang, Bo Ma, Yonghao Wang, Rongfeng Shen, Pak-Hin Thomas Tam, Zhecheng Hu, Yanlv Yang, Fabo Feng, Beibei Liu, Quanzhi Ye, Maosheng Xiang, Jie Yu, Jinghua Zhang, Yaqian Wu, Weikai Zong, Haibo Yuan, Tanda Li, Yinan Zhao, Yuanchuan Zou, and Jinzhong Liu "Science goals of the Earth 2.0 space mission", Proc. SPIE 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave, 1218016 (27 August 2022); https://doi.org/10.1117/12.2630151

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