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Scientific objectives and payload configuration of the Chang'E-7 mission

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National science Review 2024年第2期11卷 285-300页

作者： Chi Wang Yingzhuo Jia Changbin Xue Yangting lin Jianzhong liu xiaohui Fu lin Xu yun Huang yufen zhao Yigang Xu Rui Gao Yong Wei yuhua Tang Dengyun yu Yongliao Zou State Key Laboratory of space Weather National Space Science Center Chinese Academy of Sciences National space science Center Chinese Academy of Sciences Institute of Geology and Geophysics Chinese Academy of Sciences Institute of Geochemistry Chinese Academy of Sciences Shandong Provincial Key Laboratory of Optical astronomy and Solar-Terrestrial Environment School of Space Science and Physics Institute of Space SciencesShandong University Institute of Drug Discovery Technology Ningbo University State Key Laboratory of Isotope Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences school of Earth science and Engineering Sun Yat-sen University Lunar Exploration and space Engineering Center china Aerospace science and Technology Corporation

As the cornerstone mission of the fourth phase of the Chinese Lunar Exploration Program, Chang'E-7(CE-7) was officially approved, and implementation started in 2022, including a main probe and a communication relay satellite. The main probe, consisting of an orbiter, a lander, a rover and a mini-flying probe, is scheduled to be launched in 2026. The lander will land on Shackleton crater's illuminated rim near the lunar south pole, along with the rover and mini-flying probe. The relay satellite(named Queqiao-2) will be launched in February 2024 as an independent mission to support relay communication during scientific exploration undertaken by Chang'E-4, the upcoming Chang'E-6 in 2024 and subsequent lunar *** CE-7 mission is mainly aimed at scientific and resource exploration of the lunar south pole. We present CE-7's scientific objectives, the scientific payloads configuration and the main functions for each scientific payload with its key technical specifications.

关键词： Chang’ E-7 scientific objectives scientific payloads

On some applications of invariant manifolds

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Research in astronomy and Astrophysics 2011年第1期11卷 103-118页

作者： xi-yun hou lin liu yu-hui zhao astronomy Department Nanjing University Nanjing 210093 China Institute of space Environment and Astrodynamics Nanjing University Nanjing 210093 China

Taking transfer orbits of a collinear libration point probe, a lunar probe and an interplanetary probe as examples, some applications of stable and unstable invariant manifolds of the restricted three-body problem are discussed. Research shows that transfer energy is not necessarily conserved when invariant manifolds are used. For the cases in which the transfer energy is conserved, the cost is a much longer transfer time.

关键词： celestial mechanics

GRB 210610B:The Internal and External Plateau as Evidence for the Delayed Outflow of Magnetar

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Research in astronomy and Astrophysics 2024年第7期24卷 170-180页

作者： Yi-Ning Wei xiang-Gao Wang Da-Bin lin Wei-Kang Zheng Liang-Jun Chen Sheng-yu Yan Shuang-xi Yi Qi Wang Zi-Min Zhou hui-Ya liu En-Wei Liang Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and TechnologyGuangxi UniversityNanning 530004China GXU-NAOC Center for Astrophysics and space sciences Nanning 530004China Department of astronomy University of CaliforniaBerkeleyCA 94720-3411USA Department of Physics and Tsinghua Center for Astrophysics(THCA) Tsinghua UniversityBeijing 100084China school of Physics and Physical Engineering Qufu Normal UniversityQufu 273165China

After launching a jet,outflows of magnetar were used to account for the achromatic plateau of afterglow and the early X-ray flux plateau known as“internal plateau”.The lack of detecting magnetic dipole emission together with the energy injection feature in a single observation poses confusion until the long gamma-ray burst(GRB)210610B is *** 210610B is presented with an optical bump following an early X-ray plateau during the afterglow *** plateau followed by a steep decline flux overlays in the steadily decaying X-ray flux with indexα_(X,1)~2.06,indicating an internal origin and that can be fitted by the spin-down luminosity law with the initial plateau luminosity log_(10)L_(X)~48.29 erg s~(-1)and the characteristic spin-down timescale T~2818 s.A subsequent bump begins at~4000 s in the R band with a rising indexα_(R,1)~-0.30 and peaks at~14125 s,after which a decay indexα_(R,2)~0.87 and finally transiting to a steep decay withα_(R,3)~1.77 achieve the closure relation of the external shock for the normal decay phase as well as the magnetar spin-down energy injection phase,provided that the average value of the photon indexΓ_γ=1.80 derived from the spectral energy distributions(SEDs)between the X-ray and optical *** closure relation also works for the late X-ray *** to the traditional picture of GRB,the outflow powers the early X-ray plateau by dissipating energy internally and collides with the leading decelerating blast burst as time goes on,which could interpret the exotic feature of GRB *** carry out a Markov Chain Monte Carlo simulation and obtain a set of best parameters:■.The artificial light curve can fit the afterglow data *** that,we estimated the average Lorentz factor and the X-ray radiation efficiency of the later ejecta are 35%and 0.13%,respectively.

关键词： (stars)gamma-ray burst individual(GRB 210610B)-(stars)gamma-ray burst general-stars jets

Probing dark matter particles from evaporating primordial black holes via electron scattering in the CDEX-10 experiment

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science china(Physics,Mechanics & astronomy) 2024年第10期67卷 83-91页

作者： Zhenhua Zhang Litao Yang Qian yue Kejun Kang yuanjing Li Haipeng An Greeshma C. Jianping Chang yunhua Chen Jianping Cheng Wenhan Dai Zhi Deng Changhao Fang xinping Geng hui Gong Qiuju Guo Tao Guo Xuyuan Guo Li He Shengming He Jinwei Hu Hanxiong Huang Tuchen Huang lin Jiang S.Karmakar Haubin Li Hanyu Li Jianmin Li Jin Li Qianyun Li Renmingjie Li Xueqian Li yulan Li Yifan Liang Bin Liao FongKay lin ShinTed lin Jiaxuan liu Shukui liu Yandong liu yu liu yuanyuan liu Hao Ma yucai Mao Qiyuan Nie Jinhua Ning hui Pan Ningchun Qi Jie Ren xichao Ruan Monoj Kumar Singh Tianxi Sun Changjian Tang Yang Tian Guangfu Wang Junzheng Wang Li Wang Qing Wang yufeng Wang yunxiang Wang Henry Tsz-King Wong Shiyong Wu yucheng Wu Haoyang xing Rui Xu Yin Xu Tao Xue yulu Yan Nan Yi Chunxu yu Haijun yu Jianfeng yue Ming Zeng Zhi Zeng Bingtao Zhang Fengshou Zhang Lei Zhang Zhenyu Zhang Jizhong zhao Kangkang zhao Minggang zhao Jifang Zhou Zuying Zhou Jingjun Zhu CDEX Collaboration Key Laboratory of Particle and Radiation Imaging(Ministry of Education)and Department of Engineering Physics Tsinghua UniversityBeijing 100084China Department of Physics Tsinghua UniversityBeijing 100084China Institute of Physics Academia SinicaTaipei 11529China NUCTECH Company Beijing 100084China YaLong River Hydropower Development Company Chengdu 610051China College of Nuclear science and Technology Beijing Normal UniversityBeijing 100875China College of Physics Sichuan UniversityChengdu 610065China school of Physics Peking UniversityBeijing 100871China Department of Nuclear Physics China Institute of Atomic EnergyBeijing 102413China Sino-French Institute of Nuclear and Technology Sun Yet-sen UniversityZhuhai 519082China school of Physics Nankai UniversityTianjin 300071China Department of Physics Banaras Hindu UniversityVaranasi 221005India Department of Physics Beijing Normal UniversityBeijing 100875China 不详

Dark matter(DM)is a major constituent of the ***,no definite evidence of DM particles(denoted as“χ”)has been found in DM direct detection(DD)experiments to *** is a novel concept of detectingχfrom evaporating primordial black holes(PBHs).We search forχemitted from PBHs by investigating their interaction with target *** examined PBH masses range from 1×10^(15)to 7×10^(16)g under the current limits of PBH abundance *** 205.4 kg·day data obtained from the CDEX-10 experiment conducted in the china Jinping Underground Laboratory,we exclude theχ-electron(χ-e)elastic-scattering cross sectionσ_(χe)~5×10^(-29)cm^(2)forχwith a mass■keV from our *** the higher radiation background but lower energy threshold(160 eV),CDEX-10 fills a part of the gap in the previous ***(m_(χ),σ_(χe))can be determined in the future,DD experiments are expected to impose strong constraints on fPBHfor large MPBHs.

关键词： CDEX primordial black hole light dark matter particle dark matter-electron scattering high purity germanium detector

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The In-Flight Realtime Trigger and Localization Software of GECAM

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Research in astronomy and Astrophysics 2024年第10期24卷 11-24页

作者： xiao-yun zhao Shao-lin xiong xiang-Yang Wen xin-Qiao Li Ce Cai Shuo xiao Qi Luo Wen-xi Peng Dong-Ya Guo Zheng-Hua An Ke Gong Jin-yuan Liao Yan-Qiu Zhang yue Huang Lu Li xing Wen Fei Zhang Jing Duan Chen-Wei Wang Dong-Li Shi Peng Zhang Qi-Bin Yi Chao-Yang Li Yan-Bing Xu xiao-Hua Liang Ya-Qing liu Da-Li Zhang xi-Lei Sun Fan Zhang Gang Chen Huan-yu Wang Sheng Yang xiao-Jing liu Min Gao Mao-Shun Li Jin-Zhou Wang xing Zhou Yi zhao Wang-Chen Xue Chao Zheng Jia-Cong liu xing-Bo Han Jin-ling Qi Jia Huang Ke-Ke Zhang Can Chen xiong-Tao Yang Dong-Jie hou yu-Sa Wang Rui Qiao xiang Ma xiao-Bo Li Ping Wang xin-Ying Song Li-Ming Song Shi-Jie Zheng Bing Li Hong-Mei Zhang yue Zhu Wei Chen Jian-Jian He Zhen Zhang Jin hou Hong-Jun Wang Yan-Chao Hao xiang-yu Wang Zong-yuan Yang Zhi-Long Wen Zhi Chang yuan-yuan Du Rui Gao xiao-Fei Lan Yan-Guo Li Gang Li Xu-Fang Li Fang-Jun Lu Hong Lu Bin Meng Feng Shi hui Wang hui-Zhen Wang yu-Peng Xu Jia-Wei Yang Xue-Juan Yang Shuang-Nan Zhang Chao-yue Zhang Cheng-Mo Zhang Zhi-Cheng Tang Cheng Cheng Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China university of Chinese Academy of sciences Chinese Academy of SciencesBeijing 100049China school of Information science and Technology Southwest Jiaotong UniversityChengdu 611756China Key Laboratory of Stellar and Interstellar Physics and Department of Physics Xiangtan UniversityXiangtan 411105China Physics and space science College China West Normal UniversityNanchong 637002China Department of astronomy Beijing Normal UniversityBeijing 100875China Innovation Academy for Microsatellites of CAS Shanghai 201203China Changchun university of science and Technology Changchun 130022China Chinese Academy of sciences South America Center for astronomy National Astronomical ObservatoriesCASBeijing 100101China

Realtime trigger and localization of bursts are the key functions of GECAM,an all-sky gamma-ray monitor launched on 2020 December *** developed a multifunctional trigger and localization software operating in the CPU of the GECAM Electronic *** onboard software has the following features:high trigger efficiency for real celestial bursts with a suppression of false triggers caused by charged particle bursts and background fluctuation,dedicated localization algorithm optimized for both short and long bursts,and low time latency of the trigger information which is downlinked through the Global Short Message Communication service of the global BeiDou navigation *** paper provides a detailed description of the design and development of the trigger and localization software system for *** covers the general design,workflow,the main functions,and the algorithms used in the *** paper also includes on-ground trigger tests using simulated gamma-ray bursts generated by a dedicated X-ray tube,as well as an overview of the performance for real celestial bursts during its in-orbit operation.

关键词： telescopes instrumentation:detectors methods:observational

Genetic analysis and QTL mapping of a novel reduced height gene in common wheat (Triticum aestivum L.)

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Journal of Integrative Agriculture 2020年第7期19卷 1721-1730页

作者： Zhou Chun-yun xiONG Hong-chun LI yu-ting GUO hui-jun xiE Yong-dun zhao lin-shu GU Jia-yu zhao Shi-rong DING yu-ping SONG xi-yun liu Lu-xiang school of Life sciences Qingdao Agricultural UniversityQingdao 266109P.R.China Institute of Crop sciences Chinese Academy of Agricultural Sciences/National Engineering Laboratory for Crop Molecular Breeding/National Center of Space Mutagenesis for Crop ImprovementBeijing 100081P.R.China

Low stature in wheat is closely associated with lodging resistance,and this impacts harvest index and grain *** discovery of novel dwarfing or semi-dwarfing genes can have great significance for dwarf wheat *** this study,we identified an EMS induced dwarf wheat mutant JE0124 from the elite cultivar ***0124 possesses increased stem strength and a 33%reduction in plant height compared with wild *** acid(GA)treatment analysis suggested that JE0124 was *** of the frequency distribution of plant height in four F,populations derived from crosses between JE0124 and the relatively taller varieties Nongda 5181 and WT indicated that the dwarfism phenotype was quantitatively *** used two F,populations and 312 individuals from the reciprocal cross of Nongda 5181 and JE0124 to map the quantitative trait locus(QTL)for reduced height to a 0.85-cM interval on chromosome *** mapping was done by using a combination of 660K SNP array-based bulked segregant analysis(BSA)and genetic linkage analysis,with logarithm of odds(LOD)scores of 5.34 and 5.78,***,this QTL accounted for 8.27-8.52%of the variation in the *** dwarf mutant JE0124 and the newly discovered dwarfing gene on chromosome 2DL in this study will enrich genetic resources for dwarf wheat breeding.

关键词： reduced height gene wheat QTL BSA molecular marker

Searching for exoplanets by HEPS II. detecting earth-like planets in habitable zone around planet hosts within 30 pc

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Research in astronomy and Astrophysics 2020年第3期20卷 108-121页

作者： Zhou-Yi yu hui-Gen liu Ji-lin Zhou En-Si Liang Ming Yang hui Zhang Jia-Cheng liu school of astronomy and space science Key Laboratory of Modern Astronomy and Astrophysics in Ministry of EducationNanjing UniversityNanjing 210093China

HEPS(Habitable ExoPlanet Survey) is a planning astrometry satellite that aims to find Earth-like planets in the solar neighbourhood. In this paper, we selected 140 planet harboring stars within 30 pc of the solar system to be potential targets for HEPS. We calculate the detection probability of the planet in habitable zone(HZ) for each system using the simulated data of astrometry measurements. For those host stars without planets in HZ, we inject an additional planet of 10 M⊕ in their HZs and check the stability of the systems. Considering five observation modes of different sampling cadence and total observation time, we obtain a table containing the total detection probability of the planets in HZs for all of the 140 selected systems. This paper provides a potential ranked list of target stars for HEPS, or other astrometric mission to detect Earth-like planets in the future. We also calculate an empirical fitted expression of the detection probability as a function of both sampling cadence and total observation time. We conclude a quantitative method to estimate the detection probability for certain planet hosts and observation modes via the empirical expression. We show the minimum requirements of both sampling cadence and observation time for Proxima Centauri, HD 189733 and HD 102365, if the detection probability of habitable-zone planets of these three systems needs to be 90%.

关键词： astrometry-stars planetary systems-planets and satellites detection-methods numerical

line profile analysis of an astronomical spectrograph with a laser frequency comb

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Research in astronomy and Astrophysics 2014年第8期14卷 1037-1045页

作者： Fei zhao Gang zhao Gaspare Lo Curto hui-Juan Wang yu-Juan liu Liang Wang Wei Wang Key Laboratory of Optical astronomy National Astronomical ObservatoriesChinese Academy of Sciences university of Chinese Academy of sciences Shandong Provincial Key Laboratory of Optical astronomy and Solar-Terrestrial Environment School of Space Science and PhysicsShandong University European Southern Observatory Karl-Schwarzschild-Str. 285748 GarchingGermany

We present a study of the spectral line shape associated with a High Resolution Spectrograph on the 2.16 m telescope at the xinglong Observing Station of National Astronomical Observatories, Chinese Academy of sciences. This measurement is based on modeling the instrumental line shape obtained by unresolved modes from a Yb-fiber mode-locked laser frequency comb. With the current repetition rate of 250 MHz and 26 GHz mode spacing on the spectrograph, we find the absolute variation of the line center, 0.0597 pixel in the direction of the CCDs, and 0.00275 pixel （～3 m s^-1） for relative variation in successive exposures on a short timescale. A novel double-Gaussian model is presented to improve the quality of the fit by a factor of 2.47 in a typical single exposure. We also use analysis with raw moments and central moments to characterize the change in line shape across the detector. A trend in charge transfer efficiency can be found on the E2V 4096 ×4096 CCD that provides a correction for wavelength calibration aiming to reach a level of precision for radial velocity below 1 m s^- 1.

关键词： techniques radial velocities -- instrumentation laser frequency comb

A sample of metal-poor galaxies identified from the LAMOST spectral survey

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Research in astronomy and Astrophysics 2017年第5期17卷 17-30页

作者： yu-Long Gao Jian-hui Lian Xu Kong Ze-Sen lin Ning Hu Hai-Yang liu En-Ci Wang Zi-Huang Cao Yong-hui hou yue-Fei Wang Yong Zhang CAS Key Laboratory for Research in Galaxies and Cosmology Department of Astronomy University of Scienceand Technology of China Hefei 230026 China school of astronomy and space science University of Science and Technology of China Hefei 230026 China Key Laboratory of Optical astronomy National Astronomical Observatories Chinese Academy of SciencesBeijing 100012 China nanjing Institute of Astronomical Optics & Technology National Astronomical Observatories Chinese Academyof Sciences Nanjing 210042 China

We present a sample of 48 metal-poor galaxies at z 〈 0.14 selected from 92 510 galaxies in the LAMOST survey. These galaxies are identified by their detection of the auroral emission line[OⅢ]λ4363 above the 3σ level, which allows a direct measurement of electron temperature and oxygen abundance. The emission line fluxes are corrected for internal dust extinction using the Balmer decrement method. With electron temperature derived from [OⅢ]λλ4959, 5007/[OⅢ]λ4363 and electron density from [SⅡ]λ6731/[SⅡ]λ6717, we obtain the oxygen abundances in our sample which range from 12 ＋ log（O/H） = 7.63（0.09 Z_⊙） to 8.46（0.6 Z_⊙）. We find an extremely metal-poor galaxy with 12 ＋ log（O/H） = 7.63 ± 0.01. With multiband photometric data from FUV to NIR and Hαmeasurements, we also determine the stellar masses and star formation rates, based on the spectral energy distribution fitting and Hα luminosity, respectively. We find that our galaxies have low and intermediate stellar masses with 6.39 ≤ log（M/M_⊙） ≤ 9.27, and high star formation rates（SFRs） with-2.18 ≤ log（SFR/M_⊙yr^（-1）） ≤ 1.95. We also find that the metallicities of our galaxies are consistent with the local T_e-based mass-metallicity relation, while the scatter is about 0.28 dex. Additionally,assuming the coefficient of α = 0.66, we find most of our galaxies follow the local mass-metallicity-SFR relation, but a scatter of about 0.24 dex exists, suggesting the mass-metallicity relation is weakly dependent on SFR for those metal-poor galaxies.

关键词： galaxies: abundances -- galaxies: evolution -- galaxies: starburst -- star formation