Difference imaging photometry of blended gravitational microlensing events with a numerical kernel
Difference imaging photometry of blended gravitational microlensing events with a numerical kernel
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DOI：
10.1111/j.1365-2966.2009.15098.x
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发表时间：
2009-05
影响因子：
4.8
通讯作者：
M. Albrow;K. Horne;D. Bramich;P. Fouqué;V. R. Miller;J. Beaulieu;C. Coutures;C. Coutures;J. Menzies;A. Williams;V. Batista;D. Bennett;S. Brillant;A. Cassan;S. Dieters;D. Prester;J. Donatowicz;J. Greenhill;N. Kains;S. Kane;D. Kubas;J. Marquette;K. Pollard;K. Sahu;Y. Tsapras;Y. Tsapras;J. Wambsganss;M. Zub
中科院分区：
文献类型：
--
作者：
M. Albrow;K. Horne;D. Bramich;P. Fouqué;V. R. Miller;J. Beaulieu;C. Coutures;C. Coutures;J. Menzies;A. Williams;V. Batista;D. Bennett;S. Brillant;A. Cassan;S. Dieters;D. Prester;J. Donatowicz;J. Greenhill;N. Kains;S. Kane;D. Kubas;J. Marquette;K. Pollard;K. Sahu;Y. Tsapras;Y. Tsapras;J. Wambsganss;M. Zub
差分成像的数值核方法已经实现，并应用于行星合作观测到的引力微透镜事件。研究了源-星坐标误差的影响，提出了一种新的算法来确定混合事件中微透镜的精确坐标，这是进行精确的差值图像测光所必需的。它说明了如何不需要直接从参考图像测量光度参考通量，而是可以通过测量差异图像并结合统计通量不确定性的知识来获得。与ISIS2算法相比，新算法的性能得到了改善。
The numerical kernel approach to difference imaging has been implemented and applied to gravitational microlensing events observed by the PLANET collaboration. The effect of an error in the source-star coordinates is explored and a new algorithm is presented for determining the precise coordinates of the microlens in blended events, essential for accurate photometry of difference images. It is shown how the photometric reference flux need not be measured directly from the reference image but can be obtained from measurements of the difference images combined with the knowledge of the statistical flux uncertainties. The improved performance of the new algorithm, relative to ISIS2, is demonstrated.