A Parametric Representation of Critical Curves and Caustics for a Binary Gravitational Lens

Details A Parametric Representation of Critical Curves and Caustics for a Binary Gravitational Lens A Parametric Representation of Critical Curves and Caustics for a Binary Gravitational Lens

2003-08-18

arxiv.org/abs/astro-ph/0308280v1

Prog.Theor.Phys.110:425-432,2003

Astronomy and Astrophysics

Astrophysics

8 pages (PTPTeX); accepted for publication in Prog. Theor. Phys

Scientific paper

10.1143/PTP.110.425

We find a simple expression for critical curves of a binary gravitational lens. On the basis of this, we present a parametric representation of such curves. The caustics can also be expressed with the same parameterization. The present result is helpful for efficiently constructing many templates of light curves due to binary systems, particularly extrasolar planets, which cause spikes in the light curves when a source crosses the caustics.

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