Tunable Fabry-Perot Frequency Comb for Precision Doppler Measurements

用于精密多普勒测量的可调谐法布里-珀罗频率梳

• 批准号: 1509436
• 负责人: Debra Fischer
• 金额: $ 73.51万
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-15 至 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1509436&HistoricalAwards=false
• 关键词: Tunable; Fabry; Perot; Frequency; Comb

The detection of thousands of exoplanets over the past two decades has provided a Copernican-like shift in our view of the solar system. We now know that most stars in our galaxy form with planets. We also know that low mass planets are more common than the gas giant planets that were first detected in 1995. However, the measurement of planet masses for true Earth analogs (similar in mass and orbiting in the habitable zone) is not possible with current instruments. This proposal addresses a key requirement for improving precision by developing a precise, accurate, and stable wavelength calibration system for measurements of radial velocities with a new generation of ultra-stable spectrographs. This project will provide training opportunities for students and early-career scientists and help maintain US competitiveness in an area of science that captures the public imagination.The tunable Fabry-Pérot (FP) comb is designed for stability at the level of 1 cm/s, and the narrow lines can be used to calibrate out some of the instrumental uncertainties. The emission comb spectrum is produced by filtering a bright broadband laser-driven light source with the FP interferometer. The location of the comb peaks is determined by the spacing of the FP cavity. To prevent position drifts, the comb will be locked to a hyperfine laser transition with a precision that exceeds 1 part in ten billion. To prevent changes in the free spectral range or dispersion of the comb, the instrument will be placed in a temperature-controlled vacuum enclosure, and the comb line dispersion will be monitored for any required corrections with a second stabilized laser. The goal is to reach better than 10 cm/s stability in the wavelength calibration of modern stabilized spectrometers.

在过去的二十年里，数千颗系外行星的发现为我们对太阳系的看法提供了哥白尼式的转变。我们现在知道银河系中的大多数恒星都是由行星形成的。我们还知道，低质量行星比1995年首次发现的气体巨行星更常见。然而，使用当前的仪器无法测量真正的地球类似物（质量相似且在宜居带中运行）的行星质量。 该提案通过开发用于使用新一代超稳定光谱仪测量径向速度的精确、准确和稳定的波长校准系统来解决提高精度的关键要求。 该项目将为学生和早期职业科学家提供培训机会，并帮助保持美国在一个吸引公众想象力的科学领域的竞争力。可调谐法布里-珀罗（FP）梳的设计稳定性为1 cm/s，窄线可用于校准一些仪器的不确定性。发射梳状谱是由FP干涉仪对宽带激光驱动的明亮光源进行滤波而产生的。梳状峰的位置由FP腔的间距确定。为了防止位置漂移，梳将被锁定到超精细激光跃迁，精度超过百亿分之一。为了防止自由光谱范围或梳状色散的变化，仪器将被放置在温度受控的真空外壳中，并且将用第二稳定激光器监测梳状线色散以进行任何所需的校正。 目标是在现代稳定光谱仪的波长校准中达到优于10 cm/s的稳定性。

项目成果

EXPRES. II. Searching for Planets around Active Stars: A Case Study of HD 101501

• DOI: 10.3847/1538-3881/abc41e
• 发表时间: 2020-10
• 期刊: The Astronomical Journal
• 作者: S. Cabot;R. Roettenbacher;G. Henry;Lily L. Zhao;R. Harmon;D. Fischer;J. Brewer;J. Llama;R. R. P

A Stellar Activity F-statistic for Exoplanet Surveys (SAFE)

• DOI: 10.3847/1538-3881/abf5e0
• 发表时间: 2021-04
• 期刊: The Astronomical Journal
• 作者: Parker H. Holzer;J. Cisewski-Kehe;Lily L. Zhao;E. Ford;C. Gilbertson;D. Fischer