Finite Source Effects in Microlensing Events

Details Finite Source Effects in Microlensing Events Finite Source Effects in Microlensing Events

1996-06-17

arxiv.org/abs/astro-ph/9606105v1

Astronomy and Astrophysics

Astrophysics

9 pages, no figures. Uses phyzzx. Postscript available on request

Scientific paper

The computation of the magnification of a finite source by an arbitrary gravitational lens can be reduced from a two-dimensional to a one-dimensional integral using a generalization of Stoke's theorem. For a large source lensed by a planetary-system whose planet lies at the position where one of the two images would be in the absence of a planet, the integral can be done analytically. If the planet lies at the position of the major (unperturbed) image, the excess flux is the same as it would be for an isolated planet. If the planet lies at the minor image, there is no excess flux.

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