Efficient Spectroscopy of Exoplanets at Small Angular Separations with Vortex Fiber Nulling
Efficient Spectroscopy of Exoplanets at Small Angular Separations with Vortex Fiber Nulling
复制标题
利用涡旋光纤归零对小角距系外行星进行高效光谱分析
DOI：
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发表时间：
2018
影响因子：
4.9
通讯作者：
J. Wallace
中科院分区：
文献类型：
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作者：
G. Ruane;Ji Wang;D. Mawet;N. Jovanovic;J. Delorme;B. Mennesson;J. Wallace
为表征可能适合居住的行星而设计的仪器可以将联合收割机自适应光学和高分辨率光谱技术结合起来，以实现对生命光谱迹象的最高可能灵敏度。探测来自含有生物标志物的行星的微弱信号将需要精确控制光学波前，以最大化行星信号并显著减少不必要的星光。我们提出了一种光学技术，被称为涡旋光纤调零（VFN），允许多色光从微弱的行星在非常小的距离从他们的主恒星（λ/D）被有效地路由到衍射限制摄谱仪通过单模光纤，而从星星的光被阻止进入摄谱仪。VFN利用单模光纤的空间选择性，将光与星星周围小视场内的近距离同伴隔离。我们提供的概念设计的理论性能预测，并表明，VFN可以用来表征行星的径向速度（RV）仪器在红外线检测到的不知道他们的轨道的方位角取向。使用光谱模板匹配技术，我们计算出的积分时间为400，100，100和130小时罗斯128 B与凯克，三十米望远镜，大型紫外/光学/红外探测器，分别。
Instrumentation designed to characterize potentially habitable planets may combine adaptive optics and high-resolution spectroscopy techniques to achieve the highest possible sensitivity to spectral signs of life. Detecting the weak signal from a planet containing biomarkers will require exquisite control of the optical wavefront to maximize the planet signal and significantly reduce unwanted starlight. We present an optical technique, known as vortex fiber nulling (VFN), that allows polychromatic light from faint planets at extremely small separations from their host stars (≲λ/D) to be efficiently routed to a diffraction-limited spectrograph via a single-mode optical fiber, while light from the star is prevented from entering the spectrograph. VFN takes advantage of the spatial selectivity of a single-mode fiber to isolate the light from close-in companions in a small field of view around the star. We provide theoretical performance predictions of a conceptual design and show that VFN may be utilized to characterize planets detected by radial velocity (RV) instruments in the infrared without knowledge of the azimuthal orientation of their orbits. Using a spectral template-matching technique, we calculate an integration time of ∼400, ∼100, and ∼30 hr for Ross 128 b with Keck, the Thirty Meter Telescope, and the Large Ultraviolet/Optical/Infrared Surveyor, respectively.
影响因子：
6.5
作者：
Baraffe, Isabelle;Homeier, Derek;Chabrier, Gilles
通讯作者：
Chabrier, Gilles