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The Tianlin Mission:A 6m UV/Opt/IR Space Telescope to Explore Habitable Worlds and the Universe

Research in Astronomy and Astrophysics 2023年第9期23卷 351-361页

作者： Wei Wang Meng Zhai Gang Zhao Shen Wang Jifeng Liu Jin Chang Xuejun Zhang Jihong Dong Boqian Xu Frank Grupp CAS Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China CAS South America Center for Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China The Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Universitäts Sternwarte München Scheinerstr 1München D-81679Germany Max Planck Institute for Extraterrestrial Physics Giessenbachstrasse 1D-85748 GarchingGermany

It is expected that ongoing and future space-borne planet survey missions including Transiting Exoplanet Survey Satellite(TESS),PLATO and Earth 2.0 will detect thousands of small to medium-sized planets via the transit technique,including over a hundred habitable terrestrial rocky *** conduct a detailed study of these terrestrial planets,particularly the cool ones with wide orbits,the exoplanet community has proposed various follow-up *** currently proposed European Space Agency mission Ariel is the first step for this purpose,and it is capable of characterization of planets down to warm super-Earths mainly using transmission *** NASA Large Ultraviolet/Optical/Infrared Surveyor mission proposed in the Astro2020 Decadal Survey white paper will endeavor to further identify habitable rocky planets,and is expected to launch around *** the meanwhile,China is funding a concept study of a 6 m class space telescope named Tianlin(a UV/Opt/NIR large aperture space telescope)that aims to start its operation within the next 10–15 yr and last for 5+*** will be primarily aimed at the discovery and characterization of rocky planets in the habitable zones around nearby stars and to search for potential biosignatures mainly using the direct imaging *** and emission spectroscopy at moderate to high resolution will be carried out as well on a population of exoplanets to strengthen the understanding of the formation and evolution of *** will also be utilized to perform in-depth studies of the cosmic web and early galaxies,and constrain the nature of dark matter and dark *** describe briefly the primary scientific motivations and main technical considerations based on our preliminary simulation *** find that a monolithic off-axis space telescope with primary mirror diameter larger than 6 m equipped with a high contrast coronagraph can identify water in the atmosphere of a habitable-zone Earth-like planet arou

关键词： space vehicles-Planetary Systems-astrobiology-planets and satellites terrestrial planets-instrumentation high angular resolution-instrumentation spectrographs

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Hubble WFC3 Spectroscopy of the terrestrial planets L 98–59c and d:No Evidence for a Clear Hydrogen Dominated Primary Atmosphere

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Research in Astronomy and Astrophysics 2023年第2期23卷 140-162页

作者： Li Zhou Bo Ma Yong-Hao Wang Yi-Nan Zhu School of Physics and Astronomy Sun Yat-sen UniversityZhuhai 519082China CSST Science Center for the Guangdong-Hong Kong-Macao Greater Bay Area Sun Yat-sen UniversityZhuhai 519082China School of Science Hainan UniversityHainan 570228China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China

The nearby bright M-dwarf star L 98–59 has three terrestrial-sized *** challenge remaining in characterizing atmospheres around such planets is that it is not known a priori whether they possess any *** we report on study of the atmospheres of L 98–59 c and L 98–59 d using near-infrared spectral data from the G141 grism of Hubble Space Telescope(HST)/Wide Field Camera *** can reject the hypothesis of a clear atmosphere dominated by hydrogen and helium at a confidence level of ~3σ for both *** they could have a primary hydrogen-dominated atmosphere with an opaque cloud layer,or could have lost their primary hydrogen-dominated atmosphere and re-established a secondary thin atmosphere,or have no atmosphere at *** cannot distinguish between these scenarios for the two planets using the current HST *** observations with the James Webb Space Telescope would be capable of confirming the existence of atmospheres around L 98–59 c and d and determining their compositions.

关键词： planets and satellites atmospheres-planets and satellites terrestrial planets-instrumentation spectrographs-planets and satellites individual(L 98-59 c,L 98-59 d)

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