Difference imaging photometry of blended gravitational microlensing events with a numerical kernel (CROSBI ID 147645)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Albrow, M. D. ; Horne, K. ; Bramich, D. M. ; Fouque, P. ; Miller, V. R. ; Beaulieu, J.-P. ; Coutures, C. ; Menzies, J. ; Williams, A. ; Batista, V. ; Bennett, D. P. ; Brillant, S. ; Cassan, A. ; Cook, K. H. ; Dieters, S. ; Dominis Prester, Dijana ; Donatowicz, J. ; Greenhill, J. ; Kains, N. ; Kane, S. ; Kubas, D. ; Marquette, J. B. ; Pollard, K. R. ; Sahu, K. C. ; Tsapras, Y. ; Wambsganss, J. ; Zub, M.
engleski
Difference imaging photometry of blended gravitational microlensing events with a numerical kernel
The numerical kernel approach to difference imaging has been implemented and applied to gravitational microlensing events observed by the PLANET collaboration. 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 can be obtained from measurements of the difference images combined with knowledge of the statistical flux uncertainties. An analysis of difference-imaging photometry of SAAO images of the moderate-magnifcation microlensing event OGLE 2008-BLG-229, reveals a systematic residual pattern in ISIS photometry that is not present in photometry from our new code. We draw attention to the fact that such residuals have the potential to be misinterpreted as planetary signals.
stars; statistical models; image processing techniques; photometric techniques
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Podaci o izdanju
397 (4)
2009.
2099-2105
objavljeno
0035-8711
10.1111/j.1365-2966.2009.15098.x
