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On-sky speckle nulling with the Subaru Coronagraphic Extreme AO (SCExAO) instrument

机译:斯巴鲁Coronagraphic Extreme AO(SCExAO)仪器在空中进行散斑消除

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Contrast limit for the direct imaging of extrasolar planets from ground based adaptive optics (AO) observations is set by the presence of static and slow-varying aberrations in the optical path that lead to the science instrument. To complement the otherwise highly successful angular differential imaging (ADI) technique toward small angular separation, we propose to employ additional wavefront control to modulate the diffraction. This flexible approach introduces enough diversity to discriminate genuine structures of the observed target from spurious diffraction features in the image. One possible implementation of such form of coherence differential imaging (CDI) is a speckle nulling algorithm that iteratively suppresses diffraction features inside a region constrained by the number of active elements of the deformable mirror modulating the wavefront, and the coronagraph. This paper presents on-sky results obtained with this approach, on the Subaru Coronagraphic Extreme AO (SCExAO) instrument.
机译:通过基于地面的自适应光学(AO)观测值直接对太阳系外行星成像的对比度极限是由导致科学仪器的光路中存在静态和缓慢变化的像差设置的。为了补充原本非常成功的角度差分成像(ADI)技术向小角度分离的方向发展,我们建议采用附加的波前控制来调制衍射。这种灵活的方法引入了足够的多样性,可以从图像中的伪衍射特征中区分出观察目标的真实结构。这种形式的相干微分成像(CDI)的一种可能的实现方式是散斑消除算法,该算法可迭代地抑制区域内的衍射特征,该区域受可变形镜的可调节波阵面和日冕仪的数量所限制。本文介绍了在Subaru Coronagraphic Extreme AO(SCExAO)仪器上通过这种方法获得的天空结果。

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