2009/05/18 by M. D. Albrow, K. Horne, D. M. Bramich +25
Physics and Astronomy · #Adaptive optics and wavefront sensing #Pulsars and Gravitational Waves Research #Stellar, planetary, and galactic studies #astro-ph.IM #astro-ph.SR
paper · pdf · doi:10.1111/j.1365-2966.2009.15098.x
Accepted by MNRAS, 8 pages, 4 figures
arxiv created 2009/05/18 · openalex publication_date 2009/07/20 · arxiv updated 2015/05/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
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.