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Abstract: Binary microlensing light curves have a variety of morphologies. Many areindistinguishable from point lens light curves. Of those that deviate from thepoint lens form, caustic crossing light curves have tended to dominateidentified binary lens events. Other distinctive signatures of binary lensesinclude significant asymmetry, multiple peaks, and repeating events. We havequantified, using high resolution simulations, the theoretically expectedrelative numbers of each type of binary lens event, based on its measurablecharacteristics. We find that a microlensing survey with current levels ofphotometric uncertainty and sampling should find at least as many non-causticcrossing binary lens events as caustic crossing events; in future surveys withmore sensitive photometry, the contribution of distinctive non-caustic crossingevents will be even greater. To try to explain why caustic crossing lightcurves appear to be so dominant among the published binary lensing events, weinvestigate the influence of several physical effects, including blending,sampling rate, and various binary populations.



Autor: Christopher Night, Rosanne Di Stefano, Megan Schwamb

Fuente: https://arxiv.org/







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