Design description and commissioning performance of a stable coronagraph technology development testbed for direct imaging of Earth-like exoplanets
Design description and commissioning performance of a stable coronagraph technology development testbed for direct imaging of Earth-like exoplanets
复制标题
类地系外行星直接成像稳定日冕仪技术开发试验台的设计说明和调试性能
DOI：
10.1117/12.2530401
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
R. Zimmer
中科院分区：
文献类型：
--
作者：
Keith D. Patterson;Byoung;K. Balasubramanian;T. Chui;B. Crill;J. Gill;B. Kern;R. Lam;D. Marx;D. Moody;Camilo Mejia Prada;G. Ruane;Jordan Rupp;J. Shaw;F. Shi;N. Siegler;H. Tang;J. Trauger;V. White;Daniel W. Wilson;K. Yee;R. Zimmer
对类地系外行星的直接成像需要星光抑制，在可见光下，在100毫弧秒或更小的小角距下，对比度约为1×10-10。为了帮助技术开发达到这种能力并实现未来的系外行星任务，我们建立了一个高对比度日冕仪测试台，名为十年测量测试台（DST）。截至2019年初，该测试平台已反复展示了约1×10-10的单色对比度地板，以及550 nm处的宽带性能，10%彩色带宽<4×10-10。该试验台还证明了开环对比度漂移率约为10-10/小时，温度漂移稳定性<10毫开尔文/天，掩模上的被动指向稳定性约为0.1 λ/D/天，均方根指向抖动约为0.005 λ/D。本文主要集中在测试平台硬件描述上，Seo等人的一篇配套论文详细介绍了实验结果。
Direct imaging of an Earth-like exoplanet requires starlight suppression with a contrast ratio on the order of 1×10-10 at small angular separations of 100 milliarcseconds or less in visible light. To aid the technology development to reach this capability and enable future exoplanet missions, we built a high contrast coronagraph testbed, titled the Decadal Survey Testbed (DST). As of early 2019, the testbed has repeatedly demonstrated a monochromatic contrast floor about 1×10-10, and broadband performance at 550 nm with 10% color band- width <4×10-10 . The testbed has also demonstrated open-loop contrast drift rates of around 10-10/hour, temperature drift stabilities of <10 milliKelvins/day, passive pointing stability of around 0.1 λ/D per day on the occulting mask, and rms pointing jitter around 0.005 λ/D. This paper focusses primarily on the testbed hardware description, and a companion paper by Seo et al. details the experimental results.