GMagAO-X的最终设计：GMT初光阶段的高对比度成像仪
The final design of GMagAO-X: high-contrast imaging at first-light of the GMT
AI总结：
GMagAO-X是GMT首光高对比度成像仪，采用21000促动器ExAO系统等设计，拟于2030年代中期随GMT首光启用，用于系外行星等天体的高对比度成像研究。
AI中文摘要：
GMagAO-X将成为25米巨型麦哲伦望远镜（GMT）上的首光高对比度成像仪。GMagAO-X的核心科学目标是表征比邻星b等附近岩质系外行星的大气，GMagAO-X带来的空间分辨率和灵敏度的革命性提升，将首次实现对这类行星的详细研究。其他科学目标包括：对成熟巨行星的反射光表征；测量年轻系外巨行星的变异性；以前所未有的空间分辨率表征星周盘；以高光谱分辨率表征基准恒星大气；以及绘制巨星、小行星等已分辨天体的图谱。这些及更多科学目标将通过以下设备实现：拥有21000个促动器的极端自适应光学（ExAO）系统、配备专用变形镜的集成 coronagraphic 波前控制系统，以及一套成像仪和光谱仪。GMagAO-X的科学驱动性能要求包括：在8等及更亮恒星的800纳米波段达到70%的斯特列尔比，在4λ/D（800纳米处为26毫角秒）角距下实现行星-恒星光通量比为1e-7的系外行星表征。GMagAO-X已被纳入GMT项目基线计划，目前处于最终设计阶段，目标是在2027年3月完成关键设计评审（FDR），该仪器有望在2030年代中期GMT初光时准备就绪。本文提供了该仪器的简要更新，其设计旨在实现我们的雄心勃勃的性能目标。
英文摘要：
GMagAO-X will be the first-light high-contrast imager on the 25 m Giant Magellan Telescope. The driving science case for GMagAO-X is characterization of the atmospheres of nearby rocky exoplanets such as Proxima Centauri b. The revolutionary increase in spatial resolution and sensitivity provided by GMagAO-X will enable detailed study of such planets for the first time. Additional science cases include: reflected light characterization of mature giant planets; measurement of young extrasolar giant planet variability; characterization of circumstellar disks at unprecedented spatial resolution; characterization of benchmark stellar atmospheres at high spectral resolution; and mapping of resolved objects such as giant stars and asteroids. These, and many more, science cases will be enabled by a 21,000 actuator extreme adaptive optics (ExAO) system, an integrated coronagraphic wavefront control system with dedicated deformable mirrors, and a suite of imagers and spectrographs. Science-driven performance requirements for GMagAO-X include achieving a Strehl ratio of 70% at 800 nm on 8th mag and brighter stars, and exoplanet characterization at planet:star flux-ratios of 1e-7 at 4 lambda/D (26 mas at 800 nm) separation. GMagAO-X has been added to the GMT project baseline plan and is in the final design phase, aiming to complete FDR in March, 2027. The instrument is on track to be ready at first-light of the GMT in the mid 2030s. We provide a brief update of the instrument designed to achieve our ambitious performance targets.
