HARMONI at ELT: system analysis and performance estimation of the high-contrast module
HARMONI at ELT: system analysis and performance estimation of the high-contrast module
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HARMONI at ELT：高对比度模块的系统分析和性能评估
DOI：
10.1117/12.2628927
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Carlotti A
中科院分区：
文献类型：
--
作者：
Carlotti A
HARMONI是ELT的第一个可见光和近红外积分场光谱仪。覆盖450nm ~ 2450nm的大光谱范围，分辨率3500 ~ 18000，空间采样60mas ~ 4mas。它可以在两种自适应光学模式下工作- SCAO（包括高对比度能力）和LTAO -或NOAO。该项目正在准备最终设计评审。高对比度模块（HCM）被设计用来描述距离其主星100mas（目标：50mas）的行星，并与之呈现出1比6的通量比。这样做,它将使用(1)一个被动的大气色散补偿器(2)的一组幅度变迹器和焦平面面具降低旁边的衍射强度恒星核心和减弱PSF(3)专用的泽尼克的非公共路径畸变波前传感器跟踪SCAO子系统以0.1赫兹的频率,和(4)后处理算法,将依靠IFS数据的时间和光谱多样性行星信号与噪声分离。本通信详细介绍了HCM硬件协同设计中涉及的几个权衡分析。它还提供了通过对HCM和HARMONI其余部分的端到端数值模型获得的后处理模拟IFS数据的分析得出的对比性能估计。ADI和分子定位各自的利益进行比较，在这个具体的情况下。
HARMONI is the first light visible and near-IR integral field spectrograph for the ELT. It covers a large spectral range from 450nm to 2450nm with resolving powers from 3500 to 18000 and spatial sampling from 60mas to 4mas. It can operate in two Adaptive Optics modes - SCAO (including a High Contrast capability) and LTAO - or with NOAO. The project is preparing for Final Design Reviews. The high-contrast module (HCM) has been designed to characterize planets as close as 100mas from their host star (goal: 50mas), and presenting a 1e-6 flux ratio with it. To do so, it will use (1) a passive atmospheric dispersion corrector, (2) a set of amplitude apodizers and focal plane masks to lower the diffracted intensity next to the star and attenuate the PSF core, (3) a dedicated Zernike wavefront sensor to track the non-common path aberrations with the SCAO subsystem at a 0.1Hz frequency, and (4) post-processing algorithms that will rely on the temporal and spectral diversity of the IFS data to separate the planetary signals from the noise. This communication details several trade-off analyses involved in the co-design of the hardware of the HCM. It also presents contrast performance estimates that have been derived through an analysis of post-processed, simulated IFS data obtained with an end-to-end numerical model of the HCM and the rest of HARMONI. The respective interests of ADI and molecular mapping are compared in this specific case.
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