Difference imaging photometry of blended gravitational microlensing events with a numerical kernel

M. D. Albrow*, K. Horne, D. M. Bramich, P. Fouque, V. R. Miller, J. -P. Beaulieu, C. Coutures, J. Menzies, A. Williams, V. Batista, D. P. Bennett, S. Brillant, A. Cassan, S. Dieters, D. Dominis Prester, J. Donatowicz, J. Greenhill, N. Kains, S. R. Kane, D. KubasJ. B. Marquette, K. R. Pollard, K. C. Sahu, Y. Tsapras, J. Wambsganss, M. Zub

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

129 Citations (Scopus)

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 the knowledge of the statistical flux uncertainties. The improved performance of the new algorithm, relative to isis2, is demonstrated.

Original languageEnglish
Pages (from-to)2099-2105
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume397
Issue number4
DOIs
Publication statusPublished - 21 Aug 2009

Keywords

  • methods: statistical
  • techniques: image processing
  • techniques: photometric
  • LIMB-DARKENING MEASUREMENT
  • LENSING EXPERIMENT
  • PLANET PHOTOMETRY
  • GALACTIC BULGE
  • SUBTRACTION
  • COMPANIONS
  • DISCOVERY
  • FREQUENCY
  • GIANT
  • STARS

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