System study of EPICS: the exoplanets imager for the E-ELT
System study of EPICS: the exoplanets imager for the E-ELT
复制标题
EPICS 系统研究：E-ELT 系外行星成像仪
DOI：
10.1117/12.857096
复制
发表时间：
2010
影响因子：
14.9
通讯作者：
E. Stadler
中科院分区：
文献类型：
--
作者：
C. Vérinaud;M. Kasper;J. Beuzit;R. Gratton;D. Mesa;E. Aller;E. Fedrigo;L. Abe;P. Baudoz;A. Boccaletti;M. Bonavita;K. Dohlen;N. Hubin;F. Kerber;V. Korkiakoski;J. Antichi;P. Martinez;P. Rabou;R. Roelfsema;H. Schmid;N. Thatte;G. Salter;M. Tecza;L. Venema;H. Hanenburg;R. Jager;N. Yaitskova;O. Preis;M. Orecchia;E. Stadler
欧洲南方天文台和一个大型欧洲财团完成了EPICS的A阶段研究，EPICS是一种专门用于EELT系外行星直接成像的仪器。EPICS非常雄心勃勃的科学目标，即对明亮恒星周围成熟气体巨型系外行星的反射光进行成像，对仪器对比度提出了极高的要求。ELT的分段性质表现为一个非常大的准静态高阶散斑源，这会损害相对于其母星星具有小亮度对比度的微弱源的检测。本文展示了整个系统的设计，以最大限度地提高效率的准静态散斑抑制校准和后处理使用光波的光谱和偏振依赖性。权衡，导致公共路径和衍射抑制系统的概念的选择。该仪器的性能预测使用模拟极端自适应光学系统和多色波前通过各种光学元件的传播。
ESO and a large European consortium completed the phase-A study of EPICS, an instrument dedicated to exoplanets direct imaging for the EELT. The very ambitious science goals of EPICS, the imaging of reflected light of mature gas giant exoplanets around bright stars, sets extremely strong requirements in terms of instrumental contrast achievable. The segmented nature of an ELT appears as a very large source of quasi-static high order speckles that can impair the detection of faint sources with small brightness contrast with respect to their parent star. The paper shows how the overall system has been designed in order to maximize the efficiency of quasi-static speckles rejection by calibration and post-processing using the spectral and polarization dependency of light waves. The trade-offs that led to the choice of the concepts for common path and diffraction suppression system is presented. The performance of the instrument is predicted using simulations of the extreme Adaptive Optics system and polychromatic wave-front propagation through the various optical elements.