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

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

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.

Additional Information

© 2009 RAS. Accepted 2009 May 18; received 2009 May 17; in original form 2009 February 3. This work was supported by the Marsden Fund of New Zealand under contract UOC302 and by ANR grant HOLMES during MDA's visit to the Observatoire Midi-Pyr´en´ees, Toulouse, in 2008 May–June. We thank the referee, Scott Gaudi, for his thorough report.

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