Difference imaging photometry of blended gravitational microlensing events with a numerical kernel
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Version 1 2023-05-16, 23:57Version 1 2023-05-16, 23:57
journal contribution
posted on 2025-01-15, 01:05authored byMD Albrow, K Horne, DM Bramich, P Fouque, VR Miller, Jean-Philippe BeaulieuJean-Philippe Beaulieu, C Coutures, J Menzies, A Williams, V Batista, DP Bennett, S Brilliant, A Cassan, S Dieters, D Dominis Prester, J Donatowicz, JG Greenhill, N Kains, SR Kane, D Kubas, JB Marquette, KR Pollard, KC Sahu, Y Tsapras, J Wambsganss, M Zub
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.
History
Publication title
Monthly Notices of the Royal Astronomical Society
Volume
397
Issue
4
Pagination
2099-2105
ISSN
0035-8711
Department/School
Physics, School of Natural Sciences
Publisher
Wiley-Blackwell Publishing Inc
Publication status
Published
Place of publication
Malden, USA
Rights statement
The definitive published version is available online at: http://interscience.wiley.com
Socio-economic Objectives
280120 Expanding knowledge in the physical sciences