The Feasibility of Obtaining Finite Source Sizes from MACHO‐Type Microlensing Light Curves | Zendy

Eric W. Peng | Zendy

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The Feasibility of Obtaining Finite Source Sizes from MACHO‐Type Microlensing Light Curves

Author(s) -

Eric W. Peng

Publication year - 1997

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/303502

Subject(s) - gravitational microlensing , light curve , radius , physics , astrophysics , lens (geology) , gaussian , stars , computer science , optics , computer security , quantum mechanics

Recent discussion of the effects of finite source size on high magnificationmicrolensing events due to MACHOs motivates a study into the feasibility ofobserving such effects and extracting the source radius. Simulated observationsare generated by adding Gaussian error to points sampled on theoreticalmicrolensing light curves for a limb darkened, extended source. These simulateddata sets are fitted in an attempt to see how well the fits extract the radiusof the source. The source size can be fitted with reasonable accuracy only ifthe impact parameter of the event, $p$, is less than the stellar radius,$R_{\star}$. It is possible to distinguish ``crossing'' events, ones where$p

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