论文标题
镜面视觉对高对比度自适应光学仪器的影响
Effects of Mirror Seeing on High-Contrast Adaptive Optics Instruments
论文作者
论文摘要
基于地面的直接成像调查（例如Gemini Planet Imager系外行星调查（GPIES））依靠自适应光学器件（AO）系统来形象和表征比宿主恒星的范围高达一百万倍的系外行星。可以降低AO性能的一个因素是仪器周围环境中温度差异引起的湍流（例如：“ Dome Ceew”或“镜像看到”）。在此分析中，我们使用从2014年9月到2017年2月的GPIES运动的科学观察，AO遥测以及环境数据来量化“镜像查看”对GPI工具性能的影响。我们表明，当主镜（M1）与外部空气温度平衡时，GPI性能是最佳的。然后，我们通过计算空间和时间傅立叶模式的功率谱密度（PSD）来检查镜像的特征。在PSD的惯性范围内，我们发现当M1不平衡时，空间PSD振幅会增加，并且整合的湍流可能显示出偏离Kolmogorov大气湍流模型以及1层的1层冷冻流量模型的偏差。我们最终评估了Gemini South的当前温度控制和通风策略。
Ground-based direct imaging surveys like the Gemini Planet Imager Exoplanet Survey (GPIES) rely on Adaptive Optics (AO) systems to image and characterize exoplanets that are up to a million times fainter than their host stars. One factor that can reduce AO performance is turbulence induced by temperature differences in the instrument's immediate surroundings (e.g.: "dome seeing" or "mirror seeing"). In this analysis we use science observations, AO telemetry, and environmental data from September 2014 to February 2017 of the GPIES campaign to quantify the effects of "mirror seeing" on the performance of the GPI instrument. We show that GPI performance is optimal when the primary mirror (M1) is in equilibrium with the outside air temperature. We then examine the characteristics of mirror seeing by calculating the power spectral densities (PSD) of spatial and temporal Fourier modes. Inside the inertial range of the PSDs, we find that the spatial PSD amplitude increases when M1 is out of equilibrium and that the integrated turbulence may exhibit deviations from Kolmogorov atmospheric turbulence models and from the 1-layer frozen flow model. We conclude with an assessment of the current temperature control and ventilation strategy at Gemini South.
