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arXiv 1608.01124astro-ph.IM
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用于高分辨率spectroscopy的自适应光学:直接应用于未来的NIRPS摄谱仪

Adaptive optics for high resolution spectroscopy: A direct application with the future NIRPS spectrograph

Uriel Conod, Nicolas Blind, François Wildi, Francesco Pepe

摘要:

径向速度仪器要求高光谱分辨率和极端的热机械稳定性,在光谱仪必须冷却的近红外(NIR)中甚至更难实现。对于视限摄谱仪,高光谱分辨率的代价是增加仪器体积,与主镜的直径成比例。控制径向速度摄谱仪的尺寸、成本和稳定性的一种方式是通过自适应光学(AO)系统来减小光束光学扩展量。虽然在过去的20年里,AO已经彻底改变了高角分辨率和高对比度成像领域,但它还没有(成功地)用作控制摄谱仪尺寸的方法,特别是在径向速度领域。在这项工作中,我们提出了未来的近红外光谱摄谱仪的欧洲南方天文台3.6米望远镜,这将是饲料与多模光纤的AO模块。我们使用具有14 × 14子孔径的Shack-Hartmann波前传感器会聚成AO系统,能够将50%的能量馈送到0.4”光纤中,对于I=12的M型恒星,其$μm$范围为0.98至1.8 $μm$。

英文摘要:

Radial velocity instruments require high spectral resolution and extreme thermo-mecanical stability, even more difficult to achieve in near-infra red (NIR) where the spectrograph has to be cooled down. For a seeing-limited spectrograph, the price of high spectral resolution is an increased instrument volume, proportional to the diameter of the primary mirror. A way to control the size, cost, and stability of radial velocity spectrographs is to reduce the beam optical etendue thanks to an Adaptive Optics (AO) system. While AO has revolutionized the field of high angular resolution and high contrast imaging during the last 20 years, it has not yet been (successfully) used as a way to control spectrographs size, especially in the field of radial velocities. In this work we present the AO module of the future NIRPS spectrograph for the ESO 3.6 m telescope, that will be feed with multi-mode fibers. We converge to an AO system using a Shack-Hartmann wavefront sensor with 14x14 subapertures, able to feed 50% of the energy into a 0.4" fiber in the range of 0.98 to 1.8 $μm$ for M-type stars as faint as I=12.

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