TRIPPy: TRAILED IMAGE PHOTOMETRY IN PYTHON
TRIPPy: TRAILED IMAGE PHOTOMETRY IN PYTHON
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DOI：
10.3847/0004-6256/151/6/158
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发表时间：
2016-03
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影响因子：
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通讯作者：
W. Fraser;M. Alexandersen;M. Schwamb;M. Marsset;R. Pike;J. Kavelaars;M. Bannister;S. Benecchi;A. Delsanti
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作者：
W. Fraser;M. Alexandersen;M. Schwamb;M. Marsset;R. Pike;J. Kavelaars;M. Bannister;S. Benecchi;A. Delsanti
移动源的光度测量通常遭受降低的信噪比（S/N）或通过使用圆形孔径而偏置到不正确的低值的通量测量。为了解决这个问题，我们提出了一个软件包，TRIPPy：在Python中的TRailed Image Photometry。TRIPPy引入了弹丸孔径，这是适用于线性拖尾源的圆形孔径的自然延伸。药丸形状是一个带有两个半圆形端盖的矩形，由三个参数描述，轨迹长度和角度，以及半径。TRIPPy软件包还包括一种新技术，可从侧向跟踪图像中的固定背景源生成精确的模型点扩散函数（PSF）和跟踪PSF（TSF）。TSF仅仅是模型PSF的卷积，模型PSF由moffat配置文件和超采样查找表组成。从TSF，准确的药丸孔径校正可以估计为一个功能的药丸半径的精度为10毫微克的高度拖尾源。类似于小圆形孔径和相关孔径校正的使用，小半径药丸孔径可用于保持低通量源的S/N，并应用适当的孔径校正以在所有S/N下提供准确的无偏通量测量。
Photometry of moving sources typically suffers from a reduced signal-to-noise ratio (S/N) or flux measurements biased to incorrect low values through the use of circular apertures. To address this issue, we present the software package, TRIPPy: TRailed Image Photometry in Python. TRIPPy introduces the pill aperture, which is the natural extension of the circular aperture appropriate for linearly trailed sources. The pill shape is a rectangle with two semicircular end-caps and is described by three parameters, the trail length and angle, and the radius. The TRIPPy software package also includes a new technique to generate accurate model point-spread functions (PSFs) and trailed PSFs (TSFs) from stationary background sources in sidereally tracked images. The TSF is merely the convolution of the model PSF, which consists of a moffat profile, and super-sampled lookup table. From the TSF, accurate pill aperture corrections can be estimated as a function of pill radius with an accuracy of 10 mmag for highly trailed sources. Analogous to the use of small circular apertures and associated aperture corrections, small radius pill apertures can be used to preserve S/Ns of low flux sources, with appropriate aperture correction applied to provide an accurate, unbiased flux measurement at all S/Ns.