Characterization of a dual-beam, dual-camera optical imaging polarimeter
Characterization of a dual-beam, dual-camera optical imaging polarimeter
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DOI：
10.1093/mnras/staa1049
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发表时间：
2020-04
影响因子：
4.8
通讯作者：
M. Shrestha;I. Steele;A. Piascik;H. Jermak;Robert J. Smith;C. Copperwheat
中科院分区：
文献类型：
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作者：
M. Shrestha;I. Steele;A. Piascik;H. Jermak;Robert J. Smith;C. Copperwheat
极化在各种时间域天体物理中扮演着重要的角色，以了解空间上不可分辨的可变源的磁场、几何和环境。本文介绍了一种新型的双光束、双摄像机光学成像偏振仪(MOPTOP)的实验室和地面测试结果，该偏振仪采用高灵敏度、低噪声的CMOS技术，旨在以低系统误差和高灵敏度监测可变和瞬态源。我们提出了一种数据简化算法，该算法可以在逐个源的基础上校正摄像机之间的灵敏度差异。使用我们的数据简化算法，我们发现我们的双光束、双摄像机技术提供了低且稳定的仪器偏振(实验室数据为0.05美元，天空数据为0.25美元)和高吞吐量的优点，同时避免了与双光束、单摄像机偏振仪相关的额外的天空亮度和图像重叠问题。
Polarization plays an important role in various time-domain astrophysics to understand the magnetic fields, geometry, and environments of spatially unresolved variable sources. In this paper we present the results of laboratory and on-sky testing of a novel dual-beam, dual-camera optical imaging polarimeter (MOPTOP) exploiting high sensitivity, low-noise CMOS technology and designed to monitor variable and transient sources with low systematic errors and high sensitivity. We present a data reduction algorithm that corrects for sensitivity variations between the cameras on a source-by-source basis. Using our data reduction algorithm, we show that our dual-beam, dual-camera technique delivers the benefits of low and stable instrumental polarization ($<0.05$\% for lab data and $<0.25$\% for on sky data) and high throughput while avoiding the additional sky brightness and image overlap problems associated with dual-beam, single-camera polarimeters.