Detecting and characterizing exoplanets with a 1.4-m space telescope: the Pupil mapping Exoplanet Coronagraphic Observer (PECO)
Detecting and characterizing exoplanets with a 1.4-m space telescope: the Pupil mapping Exoplanet Coronagraphic Observer (PECO)
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使用 1.4 米太空望远镜探测和表征系外行星：瞳孔测绘系外行星日冕观测仪 (PECO)
DOI：
10.1117/12.826350
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
R. Woodruff
中科院分区：
文献类型：
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作者：
O. Guyon;J. Angel;R. Belikov;R. Egerman;D. Gavel;A. Give'on;T. Greene;K. Cahoy;B. Kern;M. Levine;S. Ridgway;S. Shaklan;D. Tenerelli;R. Vanderbei;R. Woodruff
瞳孔映射系外行星日冕观测者（PECO）任务概念使用一个1.4米的天基日冕望远镜在光学波长上对太阳系外行星系统进行成像和表征。PECO采用高性能的相位诱导振幅Apodization （PIAA）日冕仪，在2 λ/D分离（0.15”）下提供10-10的对比度，该日冕仪重新绘制了望远镜瞳孔，并利用了几乎所有进入光圈的光。对于系外行星的表征，PECO在波长为0.4至0.9 μm的16个光谱波段同时获取窄场图像，利用所有可用光子进行最大的波前传感和成像和光谱灵敏度。光学设计经过优化，可以使用中等大小的望远镜同时对行星和尘埃盘进行低分辨率光谱表征。PECO将以R≈15的光谱分辨率对大约20颗已知的F， G， K恒星的可居住区域进行成像，其灵敏度足以探测和表征类地行星，并将尘埃盘绘制到我们黄道带尘埃云亮度的一小部分范围内。与类地行星探测日冕仪飞行基线1号考虑的其他日冕仪方法相比，PECO采用的PIAA日冕仪所需的望远镜直径减少了两倍，因此对于更大直径的望远镜也非常有价值。我们报告了正在进行的开发和成熟关键PECO技术的实验室活动，以及旨在验证PECO波前和指向稳定性要求的详细分析，而无需开发新技术。
The Pupil-mapping Exoplanet Coronagraphic Observer (PECO) mission concept uses a coronagraphic 1.4-m space-based telescope to both image and characterize extra-solar planetary systems at optical wavelengths. PECO delivers 10-10 contrast at 2 λ/D separation (0.15") using a high-performance Phase-Induced Amplitude Apodization (PIAA) coronagraph which remaps the telescope pupil and uses nearly all of the light coming into the aperture. For exoplanet characterization, PECO acquires narrow field images simultaneously in 16 spectral bands over wavelengths from 0.4 to 0.9 μm, utilizing all available photons for maximum wavefront sensing and sensitivity for imaging and spectroscopy. The optical design is optimized for simultaneous low-resolution spectral characterization of both planets and dust disks using a moderate-sized telescope. PECO will image the habitable zones of about 20 known F, G, K stars at a spectral resolution of R≈15 with sensitivity sufficient to detect and characterize Earth-like planets and to map dust disks to within a fraction of our own zodiacal dust cloud brightness. The PIAA coronagraph adopted for PECO reduces the required telescope diameter by a factor of two compared with other coronagraph approaches that were considered for Terrestrial Planet Finder Coronagraph Flight Baseline 1, and would therefore also be highly valuable for larger telescope diameters. We report on ongoing laboratory activities to develop and mature key PECO technologies, as well as detailed analysis aimed at verifying PECO's wavefront and pointing stability requirement can be met without requiring development of new technologies.