CHARA阵列双场干涉测量的实测演示
On-sky demonstration of dual-field interferometry at the CHARA Array
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中文总结 AI 辅助
本研究在CHARA阵列完成双场干涉测量的实测演示，利用MIRC-X和MYSTIC光束组合器对α Piscium进行观测，分辨子系统并测量相对天体测量，还开展相关测试与模拟以扩展该模式至暗弱目标。
中文摘要 AI 辅助
双场干涉测量利用一颗亮参考星进行实时条纹跟踪，使第二个光束组合器能对较暗的离轴科学目标进行长相干积分。在高角分辨率天文中心（CHARA）阵列，我们使用H波段的六望远镜MIRC-X和K波段的MYSTIC光束组合器实现该模式。2025年夏季，我们在分层三合星α Piscium上首次演示此能力：MIRC-X在H波段跟踪A分量，MYSTIC在K波段观测B分量，分辨了7毫角秒的Ba-Bb子系统，测量1.85角秒的A-B对的相对天体测量，不确定度为234微角秒。本文还描述后续相位跟踪测试、初步灵敏度模拟，以及旨在将该模式扩展至暗弱离轴科学目标的计划仪器升级。
英文摘要
Dual-field interferometry uses a bright reference star for real-time fringe tracking, allowing a second beam combiner to record long coherent integrations on a fainter off-axis science target. At the Center for High Angular Resolution Astronomy (CHARA) Array, we implement this mode using the six-telescope MIRC-X and MYSTIC beam combiners in the H and K bands, respectively. We first demonstrated this capability in summer 2025 on the hierarchical triple $α$~Piscium. MIRC-X tracked component A in the $H$ band, while MYSTIC observed component B in the K band, resolving the 7~mas Ba--Bb subsystem and measuring the relative astrometry of the 1.85~arcsec A--B pair with an uncertainty of 234~$μ$as. Here, we describe subsequent phase-tracking testing, preliminary sensitivity simulations, and planned instrumental upgrades aimed at extending this mode to faint off-axis science targets.
