University of Tasmania
Browse

File(s) under permanent embargo

A systematic fitting scheme for caustic-crossing microlensing events

journal contribution
posted on 2023-05-16, 23:55 authored by Kains, N, Cassan, A, Horne, K, Albrow, MD, Dieters, S, Fouque, P, Greenhill, JG, Udalski, A, Zub, M, Bennett, DP, Dominik, M, Donatowicz, J, Kubas, D, Tsapras, Y, Anguita, T, Batista, V, Beaulieu, JP, Brilliant, S, Bode, M, Bramich, DM, Burgdorf, M, Caldwell, JAR, Cook, KH, Coutures, C, Dominis Prester, D, Jorgensen, 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, Pietrzynski, G, Soszynski, I, Szewczyk, O, Szymanski, MK, Ulaczyk, K, Wyrzykowski, L
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.

History

Publication title

Monthly Notices of the Royal Astronomical Society

Volume

395

Pagination

787-796

ISSN

0035-8711

Department/School

School of Natural Sciences

Publisher

Wiley-Blackwell Publishing Inc

Place of publication

Malden, USA

Rights statement

The definitive published version is available online at: http://interscience.wiley.com

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the physical sciences

Usage metrics

    University Of Tasmania

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC