Publikace ÚTF

Critical-Curve Topologies of Triple Gravitational Lenses

Daněk, K.; Heyrovský, D.

An extrasolar analog of the Sun–Jupiter–Saturn system has been discovered recently by detecting its gravitational microlensing action on the flux from a background star [1]. More generally, however, gravitational lensing by a system of three bodies has not yet been satisfactorily analyzed theoretically. Correct interpretation of microlensing light curves requires an understanding of the geometry of the underlying lens caustic and critical curves. These curves correspond to source positions and image positions, respectively, with infinite point-source-flux amplification. Following the pioneering Erdl and Schneider analysis of the parameter dependence of binary lensing [2], we extend their approach to special cases of the triple lens. While the binary lens is characterized by two parameters, three more parameters are needed to describe the triple lens. We present here an example of a three-dimensional cut through the five-dimensional parameter space, identifying the boundaries of regions with different critical-curve topology.
type:inproceedings
volume:157
pages:423
year:2014
link: https://link.springer.com/chapter/10.1007/978-3-319-06761-2_58
grants:Gravitational microlensing caustics and extended sources, GAČR P209/10/1318; 2010-2014; hlavní řešitel: David Heyrovský
Studium astrofyzikálních důsledků obecné teorie relativity; 2011-2013; řešitelé: Petra Suková, Pavel Čížek, Kamil Daněk, Milan Šrámek
Aktuální problémy teoretické fyziky, astronomie a astrofyziky; 2013; řešitel: Oldřich Semerák
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