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首页> 外文会议>Conference on ground-based and airborne instrumentation for astronomy >Gemini Planet Imager Observational Calibrations Ⅵ: Photometric and Spectroscopic Calibration for the Integral Field Spectrograph
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Gemini Planet Imager Observational Calibrations Ⅵ: Photometric and Spectroscopic Calibration for the Integral Field Spectrograph

机译：双子座行星成像仪观测校准Ⅵ：积分场光谱仪的光度和光谱校准

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The Gemini Planet Imager (GPI) is a new facility instrument for the Gemini Observatory designed to provide direct detection and characterization of planets and debris disks around stars in the solar neighborhood. In addition to its extreme adaptive optics and coronagraphic systems which give access to high angular resolution and high-contrast imaging capabilities, GPI contains an integral field spectrograph providing low resolution spectroscopy across five bands between 0.95 and 2.5 μm. This paper describes the sequence of processing steps required for the spectro-photometric calibration of GPI science data, and the necessary calibration files. Based on calibration observations of the white dwarf HD 8049 B we estimate that the systematic error in spectra extracted from GPI observations is less than 5%. The flux ratio of the occulted star and fiducial satellite spots within coronagraphic GPI observations, required to estimate the magnitude difference between a target and any resolved companions, was measured in the H-band to be Δm = 9.23 ± 0.06 in laboratory measurements and Δm = 9.39 ±0.11 using on-sky observations. Laboratory measurements for the Y, J, K1 and K2 filters are also presented. The total throughput of GPI, Gemini South and the atmosphere of the Earth was also measured in each photometric passband, with a typical throughput in H-band of 18% in the non-coronagraphic mode, with some variation observed over the six-month period for which observations were available. We also report ongoing development and improvement of the data cube extraction algorithm.
机译：Gemini行星成像仪（GPI）是Gemini天文台的一种新型设施仪器，旨在直接检测和表征太阳附近恒星周围的行星和碎片盘。除了可提供高角度分辨率和高对比度成像功能的极端自适应光学和冠状成像系统之外，GPI还包含一个积分场光谱仪，可在0.95至2.5μm的五个波段上提供低分辨率光谱。本文介绍了GPI科学数据的分光光度校准所需的处理步骤顺序，以及必要的校准文件。基于对白矮星HD 8049 B的校准观测，我们估计从GPI观测中提取的光谱中的系统误差小于5％。在实验室测量中，在H波段中测得的H波段测得的晕影GPI观测值中掩星和基准卫星点的通量比是估计目标与任何已分辨伴星之间的差值所需的通量比，其Δm= 9.23±0.06。使用空中观测值的结果为9.39±0.11。还介绍了Y，J，K1和K2过滤器的实验室测量值。在每个光度学通带中，还测量了GPI，Gemini South和地球大气的总吞吐量，在非电晕模式下，H波段的典型吞吐量为18％，在六个月的时间内观察到一些变化对于哪些观察可用。我们还报告了数据立方体提取算法的持续开发和改进。

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