A systematic fitting scheme for caustic-crossing microlensing events

N. Kains; A. Cassan; K. Horne; M. D. Albrow; S. Dieters; P. Fouqué; J. Greenhill; A. Udalski; M. Zub; D. P. Bennett; M. Dominik; J. Donatowicz; D. Kubas; Y. Tsapras; T. Anguita; V. Batista; J. P. Beaulieu; S. Brillant; M. Bode; D. M. Bramich; M. Burgdorf; J. A.R. Caldwell; K. H. Cook; Ch Coutures; D. Dominis Prester; U. G. Jørgensen; S. Kane; J. B. Marquette; R. Martin; J. Menzies; K. R. Pollard; N. Rattenbury; K. C. Sahu; C. Snodgrass; I. Steele; C. Vinter; J. Wambsganss; A. Williams; M. Kubiak; G. Pietrzyński; I. Soszyński; O. Szewczyk; M. K. Szymański; K. Ulaczyk; L. Wyrzykowski

doi:10.1111/j.1365-2966.2009.14615.x

A systematic fitting scheme for caustic-crossing microlensing events

N. Kains, A. Cassan, K. Horne, M. D. Albrow, S. Dieters, P. Fouqué, J. Greenhill, A. Udalski, M. Zub, D. P. Bennett, M. Dominik, J. Donatowicz, D. Kubas, Y. Tsapras, T. Anguita, V. Batista, J. P. Beaulieu, S. Brillant, M. Bode, D. M. BramichM. Burgdorf, J. A.R. Caldwell, K. H. Cook, Ch Coutures, D. Dominis Prester, U. G. Jørgensen, S. Kane, J. B. Marquette, R. Martin, J. Menzies, K. R. Pollard, N. Rattenbury, K. C. Sahu, C. Snodgrass, I. Steele, C. Vinter, J. Wambsganss, A. Williams, M. Kubiak, G. Pietrzyński, I. Soszyński, O. Szewczyk, M. K. Szymański, K. Ulaczyk, L. Wyrzykowski

Facultad Ciencias Exactas

Producción científica: Contribución a una revista › Artículo › revisión exhaustiva

12 Citas (Scopus)

Resumen

We outline a method for fitting binary-lens caustic-crossing microlensing events based on the alternative model parametrization proposed and detailed by Cassan. As an illustration of our methodology, we present an analysis of OGLE-2007-BLG-472, a double-peaked Galactic microlensing event with a source crossing the whole caustic structure in less than three days. In order to identify all possible models we conduct an extensive search of the parameter space, followed by a refinement of the parameters with a Markov Chain Monte Carlo algorithm. We find a number of low-χ² regions in the parameter space, which lead to several distinct competitive best models. We examine the parameters for each of them, and estimate their physical properties. We find that our fitting strategy locates several minima that are difficult to find with other modelling strategies and is therefore a more appropriate method to fit this type of event.

Idioma original	Inglés
Páginas (desde-hasta)	787-796
Número de páginas	10
Publicación	Monthly Notices of the Royal Astronomical Society
Volumen	395
N.º	2
DOI	https://doi.org/10.1111/j.1365-2966.2009.14615.x
Estado	Publicada - may. 2009

Áreas temáticas de ASJC Scopus

Astronomía y astrofísica
Ciencias planetarias y espacial

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Kains, N., Cassan, A., Horne, K., Albrow, M. D., Dieters, S., Fouqué, P., Greenhill, J., Udalski, A., Zub, M., Bennett, D. P., Dominik, M., Donatowicz, J., Kubas, D., Tsapras, Y., Anguita, T., Batista, V., Beaulieu, J. P., Brillant, S., Bode, M., ... Wyrzykowski, L. (2009). A systematic fitting scheme for caustic-crossing microlensing events. Monthly Notices of the Royal Astronomical Society, 395(2), 787-796. https://doi.org/10.1111/j.1365-2966.2009.14615.x

@article{da74679e922b4ed0a8234b29667db238,

title = "A systematic fitting scheme for caustic-crossing microlensing events",

abstract = "We outline a method for fitting binary-lens caustic-crossing microlensing events based on the alternative model parametrization proposed and detailed by Cassan. As an illustration of our methodology, we present an analysis of OGLE-2007-BLG-472, a double-peaked Galactic microlensing event with a source crossing the whole caustic structure in less than three days. In order to identify all possible models we conduct an extensive search of the parameter space, followed by a refinement of the parameters with a Markov Chain Monte Carlo algorithm. We find a number of low-χ2 regions in the parameter space, which lead to several distinct competitive best models. We examine the parameters for each of them, and estimate their physical properties. We find that our fitting strategy locates several minima that are difficult to find with other modelling strategies and is therefore a more appropriate method to fit this type of event.",

keywords = "Binaries: general, Galaxy: bulge, Gravitational lensing, Methods: miscellaneous, Planetary systems",

author = "N. Kains and A. Cassan and K. Horne and Albrow, {M. D.} and S. Dieters and P. Fouqu{\'e} and J. Greenhill and A. Udalski and M. Zub and Bennett, {D. P.} and M. Dominik and J. Donatowicz and D. Kubas and Y. Tsapras and T. Anguita and V. Batista and Beaulieu, {J. P.} and S. Brillant and M. Bode and Bramich, {D. M.} and M. Burgdorf and Caldwell, {J. A.R.} and Cook, {K. H.} and Ch Coutures and {Dominis Prester}, D. and J{\o}rgensen, {U. G.} and S. Kane and Marquette, {J. B.} and R. Martin and J. Menzies and Pollard, {K. R.} and N. Rattenbury and Sahu, {K. C.} and C. Snodgrass and I. Steele and C. Vinter and J. Wambsganss and A. Williams and M. Kubiak and G. Pietrzy{\'n}ski and I. Soszy{\'n}ski and O. Szewczyk and Szyma{\'n}ski, {M. K.} and K. Ulaczyk and L. Wyrzykowski",

year = "2009",

month = may,

doi = "10.1111/j.1365-2966.2009.14615.x",

language = "English",

volume = "395",

pages = "787--796",

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

issn = "0035-8711",

publisher = "Oxford University Press",

number = "2",

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Kains, N, Cassan, A, Horne, K, Albrow, MD, Dieters, S, Fouqué, P, Greenhill, J, Udalski, A, Zub, M, Bennett, DP, Dominik, M, Donatowicz, J, Kubas, D, Tsapras, Y, Anguita, T, Batista, V, Beaulieu, JP, Brillant, S, Bode, M, Bramich, DM, Burgdorf, M, Caldwell, JAR, Cook, KH, Coutures, C, Dominis Prester, D, Jørgensen, UG, Kane, S, Marquette, JB, Martin, R, Menzies, J, Pollard, KR, Rattenbury, N, Sahu, KC, Snodgrass, C, Steele, I, Vinter, C, Wambsganss, J, Williams, A, Kubiak, M, Pietrzyński, G, Soszyński, I, Szewczyk, O, Szymański, MK, Ulaczyk, K & Wyrzykowski, L 2009, 'A systematic fitting scheme for caustic-crossing microlensing events', Monthly Notices of the Royal Astronomical Society, vol. 395, n.º 2, pp. 787-796. https://doi.org/10.1111/j.1365-2966.2009.14615.x

TY - JOUR

T1 - A systematic fitting scheme for caustic-crossing microlensing events

AU - Kains, N.

AU - Cassan, A.

AU - Horne, K.

AU - Albrow, M. D.

AU - Dieters, S.

AU - Fouqué, P.

AU - Greenhill, J.

AU - Udalski, A.

AU - Zub, M.

AU - Bennett, D. P.

AU - Dominik, M.

AU - Donatowicz, J.

AU - Kubas, D.

AU - Tsapras, Y.

AU - Anguita, T.

AU - Batista, V.

AU - Beaulieu, J. P.

AU - Brillant, S.

AU - Bode, M.

AU - Bramich, D. M.

AU - Burgdorf, M.

AU - Caldwell, J. A.R.

AU - Cook, K. H.

AU - Coutures, Ch

AU - Dominis Prester, D.

AU - Jørgensen, U. G.

AU - Kane, S.

AU - Marquette, J. B.

AU - Martin, R.

AU - Menzies, J.

AU - Pollard, K. R.

AU - Rattenbury, N.

AU - Sahu, K. C.

AU - Snodgrass, C.

AU - Steele, I.

AU - Vinter, C.

AU - Wambsganss, J.

AU - Williams, A.

AU - Kubiak, M.

AU - Pietrzyński, G.

AU - Soszyński, I.

AU - Szewczyk, O.

AU - Szymański, M. K.

AU - Ulaczyk, K.

AU - Wyrzykowski, L.

PY - 2009/5

Y1 - 2009/5

N2 - We outline a method for fitting binary-lens caustic-crossing microlensing events based on the alternative model parametrization proposed and detailed by Cassan. As an illustration of our methodology, we present an analysis of OGLE-2007-BLG-472, a double-peaked Galactic microlensing event with a source crossing the whole caustic structure in less than three days. In order to identify all possible models we conduct an extensive search of the parameter space, followed by a refinement of the parameters with a Markov Chain Monte Carlo algorithm. We find a number of low-χ2 regions in the parameter space, which lead to several distinct competitive best models. We examine the parameters for each of them, and estimate their physical properties. We find that our fitting strategy locates several minima that are difficult to find with other modelling strategies and is therefore a more appropriate method to fit this type of event.

AB - We outline a method for fitting binary-lens caustic-crossing microlensing events based on the alternative model parametrization proposed and detailed by Cassan. As an illustration of our methodology, we present an analysis of OGLE-2007-BLG-472, a double-peaked Galactic microlensing event with a source crossing the whole caustic structure in less than three days. In order to identify all possible models we conduct an extensive search of the parameter space, followed by a refinement of the parameters with a Markov Chain Monte Carlo algorithm. We find a number of low-χ2 regions in the parameter space, which lead to several distinct competitive best models. We examine the parameters for each of them, and estimate their physical properties. We find that our fitting strategy locates several minima that are difficult to find with other modelling strategies and is therefore a more appropriate method to fit this type of event.

KW - Binaries: general

KW - Galaxy: bulge

KW - Gravitational lensing

KW - Methods: miscellaneous

KW - Planetary systems

UR - http://www.scopus.com/inward/record.url?scp=65349166306&partnerID=8YFLogxK

U2 - 10.1111/j.1365-2966.2009.14615.x

DO - 10.1111/j.1365-2966.2009.14615.x

M3 - Article

AN - SCOPUS:65349166306

SN - 0035-8711

VL - 395

SP - 787

EP - 796

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

ER -

A systematic fitting scheme for caustic-crossing microlensing events

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