Generalized Microlensing Effective Timescale
Gould, Andrew
Original · EN
The microlensing effective timescale tₑff=beta*tₑ is used frequently in high-magnification (beta << 1) microlensing events, because it is better constrained than either the impact parameter beta or the Einstein timescale tₑ separately. It also facilitates intuitive understanding of lightcurves prior to determination of a model. Similar considerations may apply to very low magnification events. I therefore provide a generalization of this quantity to all events: tₑff = beta*tₑ*sqrt((1+beta²/2)(1+beta²/4)).
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