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. Kubas; J. B. Marquette; K. R. Pollard; K. C. Sahu; Y. Tsapras; J. Wambsganss; M. Zub

doi:10.1111/j.1365-2966.2009.15098.x

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

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

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 language	English
Pages (from-to)	2099-2105
Number of pages	7
Journal	Monthly Notices of the Royal Astronomical Society
Volume	397
Issue number	4
DOIs	https://doi.org/10.1111/j.1365-2966.2009.15098.x
Publication status	Published - 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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10.1111/j.1365-2966.2009.15098.x

Astrophysics in St Andrews: Astrophysics in St Andrews / SUPA (Continuan of Rolling Grant - XPP089
Bonnell, I. A. (PI), Cameron, A. C. (CoI), Dominik, M. (CoI), Driver, S. P. (CoI), Greaves, J. S. (CoI), Horne, K. D. (CoI), Jardine, M. M. (CoI), Wood, K. (CoI) & Zhao, H. (CoI)
Science & Technology Facilities Council
1/04/09 → 31/03/12
Project: Standard

Cite this

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., Dieters, S., Prester, D. D., Donatowicz, J., Greenhill, J., Kains, N., Kane, S. R., ... Zub, M. (2009). Difference imaging photometry of blended gravitational microlensing events with a numerical kernel. Monthly Notices of the Royal Astronomical Society, 397(4), 2099-2105. https://doi.org/10.1111/j.1365-2966.2009.15098.x

@article{c142845410e24a61862c8193e320f108,

title = "Difference imaging photometry of blended gravitational microlensing events with a numerical kernel",

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.",

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

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

year = "2009",

month = aug,

day = "21",

doi = "10.1111/j.1365-2966.2009.15098.x",

language = "English",

volume = "397",

pages = "2099--2105",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "4",

}

Albrow, MD, Horne, K, Bramich, DM, Fouque, P, Miller, VR, Beaulieu, J-P, Coutures, C, Menzies, J, Williams, A, Batista, V, Bennett, DP, Brillant, S, Cassan, A, Dieters, S, Prester, DD, Donatowicz, J, Greenhill, J, Kains, N, Kane, SR, Kubas, D, Marquette, JB, Pollard, KR, Sahu, KC, Tsapras, Y, Wambsganss, J & Zub, M 2009, 'Difference imaging photometry of blended gravitational microlensing events with a numerical kernel', Monthly Notices of the Royal Astronomical Society, vol. 397, no. 4, pp. 2099-2105. https://doi.org/10.1111/j.1365-2966.2009.15098.x

TY - JOUR

T1 - Difference imaging photometry of blended gravitational microlensing events with a numerical kernel

AU - Albrow, M. D.

AU - Horne, K.

AU - Bramich, D. M.

AU - Fouque, P.

AU - Miller, V. R.

AU - Beaulieu, J. -P.

AU - Coutures, C.

AU - Menzies, J.

AU - Williams, A.

AU - Batista, V.

AU - Bennett, D. P.

AU - Brillant, S.

AU - Cassan, A.

AU - Dieters, S.

AU - Prester, D. Dominis

AU - Donatowicz, J.

AU - Greenhill, J.

AU - Kains, N.

AU - Kane, S. R.

AU - Kubas, D.

AU - Marquette, J. B.

AU - Pollard, K. R.

AU - Sahu, K. C.

AU - Tsapras, Y.

AU - Wambsganss, J.

AU - Zub, M.

PY - 2009/8/21

Y1 - 2009/8/21

N2 - 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.

AB - 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.

KW - methods: statistical

KW - techniques: image processing

KW - techniques: photometric

KW - LIMB-DARKENING MEASUREMENT

KW - LENSING EXPERIMENT

KW - PLANET PHOTOMETRY

KW - GALACTIC BULGE

KW - SUBTRACTION

KW - COMPANIONS

KW - DISCOVERY

KW - FREQUENCY

KW - GIANT

KW - STARS

U2 - 10.1111/j.1365-2966.2009.15098.x

DO - 10.1111/j.1365-2966.2009.15098.x

M3 - Article

SN - 0035-8711

VL - 397

SP - 2099

EP - 2105

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

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

Abstract

Keywords

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Projects

Astrophysics in St Andrews: Astrophysics in St Andrews / SUPA (Continuan of Rolling Grant - XPP089

Cite this