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Beyond Caustic Crossings: Properties of Binary Microlensing Light Curves

Night, Christopher and Di Stefano, Rosanne and Schwamb, Megan (2008) Beyond Caustic Crossings: Properties of Binary Microlensing Light Curves. Astrophysical Journal, 686 (2). pp. 785-800. ISSN 0004-637X. doi:10.1086/590320.

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Binary microlensing light curves have a variety of morphologies. Many are indistinguishable from point-lens light curves. Of those that deviate from the point-lens form, caustic crossing light curves have tended to dominate identified binary-lens events. Other distinctive signatures of binary lenses include significant asymmetry, multiple peaks, and repeating events. We have quantified, using high-resolution simulations, the theoretically expected relative numbers of each type of binary-lens event, based on its measurable characteristics. We find that a microlensing survey with current levels of photometric uncertainty and sampling should contain at least as many non-caustic crossing binary-lens events as caustic crossing events; in future surveys with more sensitive photometry, the contribution of distinctive non-caustic crossing events will be even greater. To show that this result is robust, we investigate the influence of several physical effects, including blending, sampling rate, and various binary populations.

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Additional Information:© 2008 The American Astronomical Society. Received 2007 April 24; accepted 2008 May 19. R. D. would like to thank Rosalba Perna and Nada Petrovic for conversations. Funded in part by NASA NAG5-10705, PHY05- 51164, and a grant for SAO Internal Research and Development.
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SAO Internal Research and DevelopmentUNSPECIFIED
Subject Keywords:gravitational lensing
Issue or Number:2
Record Number:CaltechAUTHORS:NIGapj08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13520
Deposited By: Tony Diaz
Deposited On:17 Jul 2009 23:41
Last Modified:08 Nov 2021 22:38

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