Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 397, Issue 4, Pages 2099-2105Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2009.15098.x
Keywords
methods: statistical; techniques: image processing; techniques: photometric
Categories
Funding
- Marsden Fund of New Zealand [UOC302]
- ANR
- Science and Technology Facilities Council [ST/G001987/1] Funding Source: researchfish
- STFC [ST/G001987/1] Funding Source: UKRI
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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.
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