AI 中文总结
为探测超冷矮星系外行星，设计DUET双通道成像仪，用955纳米二向色分束器将光分至不同探测器实现同时测光，选近红外滤光片抑制PWV影响，还介绍了光学、机械、探测器及控制系统等设计。
AI 中文摘要
我们展示了DUET的设计，它是为SPECULOOS南方天文台（SSO）建造的双通道成像仪，用于探测和表征围绕超冷矮星运行的凌日类地系外行星。一个955纳米的二向色分束器将可见光导向深度耗尽的硅CCD，近红外光导向基于CMOS的InGaAs探测器，实现0.4至1.7微米波段的完全同时测光。选择近红外滤光片以抑制对大气可降水汽（PWV）变化的敏感度，这是冷恒星地基红外测光中相关噪声的主要来源。我们描述了光学和机械结构、二向色镜和滤光片选择、探测器选择以及控制系统。
英文摘要
We present the design of DUET, a dual-channel imager being built for the SPECULOOS-Southern Observatory (SSO) to detect and characterise transiting terrestrial exoplanets orbiting ultra-cool dwarfs. A dichroic beamsplitter at 955\,nm directs visible light to a deeply-depleted silicon CCD and near-infrared light to a CMOS-based InGaAs detector, enabling fully simultaneous photometry with bandpasses from 0.4 to 1.7\,\textmu m. The near-infrared filters have been chosen to suppress sensitivity to atmospheric precipitable water vapour (PWV) variability, a dominant source of correlated noise in ground-based infrared photometry of cool stars. We describe the optical and mechanical architecture, the dichroic and filter selection, the choice of detectors, and the control system.
Comments12 pages, 8 figures, 2 Tables, proceedings of SPIE Astronomical Telescopes + Instrumentation 2026, 14149-438
