论文标题
Ristreto：Coronagraph和AO Design在2 Lambda/d的高色散冠状
RISTRETTO: coronagraph and AO designs enabling High Dispersion Coronagraphy at 2 lambda/D
论文作者
论文摘要
Ristretto是耦合VLT仪器球和意式浓缩咖啡的最初想法的演变，旨在高度分散性冠冕。 Ristretto是一种访客仪器，应使用高对比度，高分辨率光谱法的技术，以反射光的方式来表征附近系外行星的大气。它的目标是观察Prox CEN B和其他恒星约35Mas的行星，即在Lambda = 750nm处的2lambda/d。该仪器由极端的自适应光学器件，冠状动脉积分场单元和衍射限制光谱仪（r = 140.000，lambda = 620-840 nm）组成。 我们介绍了有关冠状动脉IFU和XAO系统的研究的地位。第一个特别是基于PIAA Apodizer的修改版本，允许在第一个衍射环上取消。我们提出的设计有可能达到> 50％的耦合，并且在观察条件中位数为2lambda/d时，在2lambda/d上对比度。
RISTRETTO is the evolution of the original idea of coupling the VLT instruments SPHERE and ESPRESSO, aiming at High Dispersion Coronagraphy. RISTRETTO is a visitor instrument that should enable the characterization of the atmospheres of nearby exoplanets in reflected light, by using the technique of high-contrast, high-resolution spectroscopy. Its goal is to observe Prox Cen b and other planets placed at about 35mas from their star, i.e. 2lambda/D at lambda=750nm. The instrument is composed of an extreme adaptive optics, a coronagraphic Integral Field Unit, and a diffraction-limited spectrograph (R=140.000, lambda=620-840 nm). We present the status of our studies regarding the coronagraphic IFU and the XAO system. The first in particular is based on a modified version of the PIAA apodizer, allowing nulling on the first diffraction ring. Our proposed design has the potential to reach > 50% coupling and <1E-4 contrast at 2lambda/D in median seeing conditions.
