一种用于SPIRou径向速度谱仪的新型红外法布里-珀罗径向速度基准模块
A new infrared Fabry-Pérot-based radial-velocity-reference module for the SPIRou radial-velocity spectrograph
摘要：
系外行星研究领域正在朝着探测和描述可居住行星的特征方向发展。这些系外地球可以很容易地发现周围的低质量恒星通过使用光度或径向速度（RV）技术。在后一种情况下，增益是两倍的，因为给定质量的行星所感应的信号更高，这是由于行星-恒星质量比更有利，而且宜居带更靠近恒星。然而，晚型恒星的辐射主要在红外（IR）波长范围内，这需要红外仪器。SPIRou是一款稳定的RV红外光谱仪，可满足这些雄心勃勃的科学目标。与任何其他光谱仪一样，校准和漂移监测是实现高精度的基础。我们的目标是构建、测试并最终运行一个基于法布里-珀罗的RV参考模块，该模块能够在SPIRou的整个波长范围内提供所需的光谱信息。我们适应了现有的HARPS法布里-珀罗校准器在IR域的操作。在制造和组装之后，我们在实验室中对FP RV模块进行了表征。我们测量了系统的精细度、透过率和光谱通量。测量的精细度值F=12.8完全符合理论值。峰值处的总透射率约为0.5%，主要受光纤连接器和接口的限制。尽管如此，所提供的通量符合SPIRou仪器设定的要求。一旦安装在SPIRou上，我们将测试RV参考模块的全部光谱特性和稳定性。目标是证明所有谱线的谱线位置和形状稳定性在两个校准序列（通常为24小时）之间优于0.3 m s $^{-1}$，从而RV参考模块可用于监测仪器漂移。
英文摘要：
The field of exoplanet research is moving towards the detection and characterization of habitable planets. These exo-Earths can be easily found around low-mass stars by using either photometric transit or radial-velocity (RV) techniques. In the latter case the gain is twofold because the signal induced by the planet of a given mass is higher due to the more favourable planet-star mass ratio and because the habitable zone lies closer to the star. However, late-type stars emit mainly in the infrared (IR) wavelength range, which calls for IR instruments. SPIRou is a stable RV IR spectrograph addressing these ambitious scientific objectives. As with any other spectrograph, calibration and drift monitoring is fundamental to achieve high precision. Our goal was to build, test and finally operate a Fabry-Pérot-based RV-reference module able to provide the needed spectral information over the full wavelength range of SPIRou. We adapted the existing HARPS Fabry-Pérot calibrator for operation in the IR domain. After manufacturing and assembly, we characterized the FP RV-module in the laboratory. We measured finesse, transmittance, and spectral flux of the system. The measured finesse value of F=12.8 corresponds perfectly to the theoretical value. The total transmittance at peak is of the order of 0.5%, mainly limited by fibre-connectors and interfaces. Nevertheless, the provided flux is in line with the the requirements set by the SPIRou instrument. Once installed on SPIRou, we will test the full spectral characteristics and stability of the RV-reference module. The goal will be to prove that the line position and shape stability of all lines is better than 0.3 m s$^{-1}$ between two calibration sequences (typically 24 hours), such that the RV-reference module can be used to monitor instrumental drifts.
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