Difference imaging photometry of blended gravitational microlensing events with a numerical kernel
Solar and Stellar Astrophysics
2015-05-13 v1 Instrumentation and Methods for Astrophysics
Abstract
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 knowledge of the statistical flux uncertainties. The improved performance of the new algorithm, relative to ISIS2, is demonstrated.
Cite
@article{arxiv.0905.3003,
title = {Difference imaging photometry of blended gravitational microlensing events with a numerical kernel},
author = {M. D. Albrow and K. Horne and D. M. Bramich and P. Fouqué and V. R. Miller and J. -P. Beaulieu and C. Coutures and J. Menzies and A. Williams and V. Batista and D. P. Bennett and S. Brillant and A. Cassan and S. Dieters and D. Dominis Prester and J. Donatowicz and J. Greenhill and N. Kains and S. R. Kane and D. Kubas and J. -B. Marquette and K. R. Pollard and K. C. Sahu and Y. Tsapras and J. Wambsganss and M. Zub},
journal= {arXiv preprint arXiv:0905.3003},
year = {2015}
}
Comments
Accepted by MNRAS, 8 pages, 4 figures