论文标题
具有卓越的恒星冠冕的概念及其用于检测外星行星的应用
Concept of an achromatic stellar coronagraph and its application for detecting extrasolar planets
论文作者
论文摘要
成像围绕其他恒星绕的行星需要阻止宿主恒星，该恒星通常比行星更明亮8-10个数量级。这是在恒星冠状动脉的帮助下实现的。在当前的工作中，引入了一种新型恒星冠状动脉的概念，其中恒星光在准光束中被线性偏振剂阻塞。它基于行星光的线性极化状态与星光的线性极化状态之间的差异旋转。这是通过在望远镜的准束光束中的一组厚的双折射晶体来实现的，与星光相比，行星光的行星光线可传播超级光路的长度。通过调节晶体的方向和厚度，可以使光路径长度导致π相差，足以将极化的初始平面旋转90°以进行行星光线，而不会影响星光。此处介绍了涉及双重晶体引起的相位差异的理论计算以及基本的配置和设计。结果表明，设计在所有波长上都相同地阻止了恒星光。使用一米类望远镜讨论了该概念在检测类似地球外星球上的应用。
Imaging the planets that orbit around other stars requires blocking the host star which is usually 8-10 orders of magnitude brighter than the planets. This is achieved with the help of a stellar coronagraph. In the current work, a concept of a new type of stellar coronagraph is introduced where the star light is blocked by a linear polarizer in the collimated beam. It is based on differential rotation between the linear polarization state of planet light and that of star light. This is achieved with the help of a set of thick birefringent crystals in the collimated beam of a telescope where the planet light is made to travel extra optical path length compared to star light. By adjusting the orientation and thickness of the crystal, the optical path length can be made to cause a phase difference of π, just enough to rotate the initial plane of polarization by 90° for planet-light without affecting the star light. Theoretical calculations involving the phase difference due to birefringent crystals are presented here along with the basic configuration and design. It is shown that the design blocks the star light identically at all wavelengths. Application of this concept for detecting Earth-like extrasolar planet is discussed using a one-meter class telescope.
