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

Albrow, M. D. and Horne, K. and Bramich, D. M. and Fouqué, P. and Miller, V. R. and Beaulieu, J. -P. and Coutures, C. and Menzies, J. and Williams, A. and Batista, V. and Bennett, D. P. and Brillant, S. and Cassan, A. and Dieters, S. and Dominis Prester, D. and Donatowicz, J. and Greenhill, J. and Kains, N. and Kane, S. R. and Kubas, D. and Marquette, J. B. and Pollard, K. R. and Sahu, K. C. and Tsapras, Y. and Wambsganss, J. and Zub, M. (2009) Difference imaging photometry of blended gravitational microlensing events with a numerical kernel. Monthly Notices of the Royal Astronomical Society, 397 (4). pp. 2099-2105. ISSN 0035-8711.

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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.

Item Type:Article
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Kane, S. R.0000-0002-7084-0529
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.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Marsden Fund of New ZealandUOC302
Agence Nationale pour la Recherche (ANR)HOLMES
Subject Keywords:methods: statistical; techniques: image processing; techniques: photometric
Issue or Number:4
Record Number:CaltechAUTHORS:20090909-095412081
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:15687
Deposited By: Jason Perez
Deposited On:14 Sep 2009 16:47
Last Modified:17 Nov 2017 00:45

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