A systematic fitting scheme for caustic-crossing microlensing events
- Kains, N.
- Cassan, A.
- Horne, K.
- Albrow, M. D.
- Dieters, S.
- Fouque, P.
- Greenhill, J.
- Udalski, A.
- Zub, M.
- Bennett, D. P.
- Dominik, Martin
- Donatowicz, J.
- Kubas, D.
- Tsapras, Y.
- Anguita, T.
- Batista, V.
- Beaulieu, J. -P.
- Brillant, S.
- Bode, M.
- Bramich, D. M.
- Burgdorf, M.
- Caldwell, J. A. R.
- Cook, K. H.
- Coutures, Ch.
- Prester, D. Dominis
- Jorgensen, U. G.
- Kane, S.
- Marquette, J. B.
- Martin, R.
- Menzies, J.
- Pollard, K. R.
- Rattenbury, N.
- Sahu, K. C.
- Snodgrass, C.
- Steele, I.
- Vinter, C.
- Wambsganss, J.
- Williams, A.
- Kubiak, M.
- Pietrzynski, G.
- Soszynski, I.
- Szewczyk, O.
- Szymanski, M. K.
- Ulaczyk, K.
- Wyrzykowski, L.
DOIAbstract
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-chi(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. ...
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