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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. http://resolver.caltech.edu/CaltechAUTHORS:NIGapj08

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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/590320DOIUNSPECIFIED
http://www.iop.org/EJ/abstract/0004-637X/686/2/785/PublisherUNSPECIFIED
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.
Funders:
Funding AgencyGrant Number
NASANAG5-10705
NASAPHY05-51164
SAO Internal Research and DevelopmentUNSPECIFIED
Subject Keywords:gravitational lensing
Record Number:CaltechAUTHORS:NIGapj08
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:NIGapj08
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13520
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:17 Jul 2009 23:41
Last Modified:27 Mar 2014 05:49

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