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A systematic fitting scheme for caustic-crossing microlensing events


Kains, N and Cassan, A and Horne, K and Albrow, MD and Dieters, S and Fouque, P and Greenhill, JG and Udalski, A and Zub, M and Bennett, DP and Dominik, M and Donatowicz, J and Kubas, D and Tsapras, Y and Anguita, T and Batista, V and Beaulieu, JP and Brilliant, S and Bode, M and Bramich, DM and Burgdorf, M and Caldwell, JAR and Cook, KH and Coutures, C and Dominis Prester, D and Jorgensen, UG and Kane, S and Marquette, JB and Martin, R and Menzies, J and Pollard, KR and Rattenbury, N and Sahu, KC and Snodgrass, C and Steele, I and Vinter, C and Wambsganss, J and Williams, A and Kubiak, M and Pietrzynski, G and Soszynski, I and Szewczyk, O and Szymanski, MK and Ulaczyk, K and Wyrzykowski, L, A systematic fitting scheme for caustic-crossing microlensing events, Monthly Notices of the Royal Astronomical Society, 395, (2) pp. 787-796. ISSN 0035-8711 (2009) [Refereed Article]

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DOI: doi:10.1111/j.1365-2966.2009.14615.x


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- 2 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.

Item Details

Item Type:Refereed Article
Keywords:gravitational lensing-methods:miscellaneous-binaries:general-planetary systems-galaxy:bulge
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Dieters, S (Dr Stefan Dieters)
UTAS Author:Greenhill, JG (Dr John Greenhill)
ID Code:57598
Year Published:2009
Web of Science® Times Cited:10
Deposited By:Physics
Deposited On:2009-07-28
Last Modified:2015-01-26

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