AI 中文总结
该研究量化了JWST与HWO在系外行星成像上的技术差距，模拟结合JWST遥测与日冕仪的望远镜，发现波前稳定性提升10倍可拓展其成像能力，明确波前稳定性是HWO的关键技术缺口。
AI 中文摘要
本研究量化了詹姆斯·韦伯空间望远镜（JWST）与宜居世界天文台（HWO）在实现类太阳恒星周围类地系外行星成像（目标原始对比度为10^-10）方面的技术差距。研究利用JWST在轨的主分段镜遥测数据，模拟了一台类似JWST的望远镜，该望远镜配备了现代日冕仪仪器——其设计灵感来自罗曼空间望远镜（RST）日冕仪（CGI），具有切趾光瞳 Lyot 日冕仪，以及针对分段式无遮挡离轴望远镜的主动可变形镜波前控制能力。研究表明，该系统在100 Hz的快速控制频率下，可针对亮度高于4等的亮星实现约10^-10的原始对比度，但对于更暗的恒星，该控制水平仍缺乏足够信号来校正JWST级别的振幅误差。研究进一步显示，假设不存在反作用轮振动，若波前稳定性提升10倍，即可将该能力扩展至所有考虑的控制频率（1 Hz至100 Hz），且针对亮度最高达11等的恒星也能实现10^-10的原始对比度。这些结果建立了将JWST已验证的热机械稳定性与HWO需求关联的新定量基准，表明主动波前控制可降低天文台的结构稳定性要求，并确定波前稳定性是HWO实现类地系外行星成像目标必须缩小的关键技术差距。
英文摘要
We provide a quantification of the technological gap between the James Webb Space Telescope (JWST) and the Habitable Worlds Observatory (HWO) for the goal of exo-Earth imaging around Sun-like stars at the $10^{-10}$ raw contrast level. We use JWST's in-flight telemetry of the primary segmented mirror to simulate a JWST-like telescope equipped with a modern coronagraph instrument, inspired by the Roman Space Telescope (RST) Coronagraphic Instrument (CGI), featuring an Apodized Pupil Lyot Coronagraph and active deformable mirror wavefront control on a segmented, unobstructed, off-axis telescope. We show that it can achieve around $10^{-10}$ raw contrast for very bright stars (brighter than magnitude 4) for fast control frequencies of 100 Hz, but that this level of control still lacks sufficient signal to correct JWST-amplitude errors for fainter stars. We show that an improvement of a factor of ten in wavefront stability is sufficient to extend this capability to a $10^{-10}$ raw contrast across all considered control frequencies (1 Hz to 100 Hz), assuming no reaction wheel vibrations, for stars up to a magnitude of 11. These results establish a new quantitative benchmark linking JWST's demonstrated thermo-mechanical stability to HWO's requirements, showing that active wavefront control relaxes the structural stability demands on the observatory, and identifying wavefront stability as the critical technological gap that must be closed for HWO to achieve its exo-Earth imaging goals.
Comments24 pages, 9 figures
