1.8米望远镜钠信标自适应光学系统的高对比度成像性能研究  

Research on high-contrast imaging performance of 1.8 m telescope sodium beacon adaptive optical system

作　　者：邓可然 魏凯[1,2,3] 晋凯 董若曦 李敏 张雨东[1,2,3] Deng Keran;Wei Kai;Jin Kai;Dong Ruoxi;Li Min;Zhang Yudong(Key Laboratory on Adaptive Optics,Chinese Academy of Sciences,Chengdu 610209,China;Institute of Optics and Electronics,Chinese Academy of Sciences,Chengdu 610209,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院自适应光学重点实验室,四川成都610209 [2]中国科学院光电技术研究所,四川成都610209 [3]中国科学院大学,北京100049

出　　处：《红外与激光工程》2020年第8期281-289,共9页Infrared and Laser Engineering

基　　金：国家自然科学基金(11443009)。

摘　　要：系外行星的直接成像是当今国际天文学研究的热点,而对潜在的系外行星候选体进行大面积普查将是未来十年天文学的迫切需要。国际上中小型2 m级望远镜上部署的ROBO-AO瑞利激光信标自适应光学系统(AO),可以灵敏而快速地删察系外行星候选体。但瑞利信标高度引起的聚焦非等晕效应是限制其行星探测能力的重要因素。基于1.8 m望远镜61单元钠信标自适应光学系统优化构建系外行星高对比度成像系统,它将在近红外波长范围内提供系外行星的高对比度成像。通过对钠信标AO高对比度成像过程的仿真,发现在理论上,钠信标AO系统的系外行星高对比度成像性能优于ROBO-AO,即在2 h曝光时间内,可以实现与母恒星光通量比为4×10^-7的行星的直接成像,而相同环境下,ROBO-AO系外行星直接成像能力为1×10^-6,其中行星与恒星的角间距为1’’。Direct imaging of exoplanets and candidates is a hot topic in international astronomy research today,and the large-scale census of potential exoplanet candidates will be an urgent need for astronomy in the next decade.The ROBO-AO Rayleigh laser beacon adaptive optical system deployed on 2 m class telescopes is essential for sensitive and rapid characterization of the exoplanet candidates,but the focus anisoplanatism effect caused by the height of Rayleigh beacons is an important factor affecting its planetary detection capabilities.An exoplanet high-contrast imaging system for the 61 units sodium beacon adaptive optics system of the 1.8 m telescope was constructed.It would provide high-contrast imaging of exoplanets in the near-infrared wavelength.By simulating the sodium beacon AO high-contrast imaging process,the high-contrast imaging performance of the exoplanets of the sodium beacon AO system was better than that of ROBO-AO in theory,and within two hours of exposure time,direct imaging of planets with a parent star light flux ratio of 4×10^-7 could be achieved,while under the same environment,the direct imaging capability of ROBO-AO exoplanets is 1×10^-6,where the angular distance between the planet and the star is 1’’.

关 键 词：钠信标 高对比度成像 星冕仪 自适应光学系统 

分 类 号：O437[机械工程—光学工程]