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

Hideki Asada | Zendy

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

Author(s) -

Hideki Asada

Publication year - 2003

Publication title -

progress of theoretical physics

Language(s) - English

Resource type - Journals

eISSN - 1347-4081

pISSN - 0033-068X

DOI - 10.1143/ptp.110.425

Subject(s) - physics , binary number , light curve , representation (politics) , gravitation , gravitational lens , parametric statistics , parametric equation , simple (philosophy) , astrophysics , classical mechanics , geometry , mathematics , philosophy , statistics , arithmetic , redshift , epistemology , galaxy , politics , political science , law

We find a simple expression for critical curves of a binary gravitationallens. On the basis of this, we present a parametric representation of suchcurves. The caustics can also be expressed with the same parameterization. Thepresent result is helpful for efficiently constructing many templates of lightcurves due to binary systems, particularly extrasolar planets, which causespikes in the light curves when a source crosses the caustics.Comment: 8 pages (PTPTeX); accepted for publication in Prog. Theor. Phy

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