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Title:
Gravitational microlensing by double stars and planetary systems
Authors:
Mao, Shude; Paczynski, Bohdan
Affiliation:
AA(Princeton University Observatory, NJ), AB(Princeton University Observatory, NJ)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 374, June 20, 1991, p. L37-L40. (ApJ Homepage)
Publication Date:
06/1991
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
DOUBLE STARS, GALACTIC BULGE, GRAVITATIONAL LENSES, PLANETARY SYSTEMS, BROWN DWARF STARS, MILKY WAY GALAXY
DOI:
10.1086/186066
Bibliographic Code:
1991ApJ...374L..37M

Abstract

Almost all stars are in binary systems. When the separation between the two components is comparable to the Einstein ring radius corresponding to the combined mass of the binary acting as a gravitational lens, then an extra pair of images can be created, and the light curve of a lensed source becomes complicated. It is estimated that about 10 percent of all lensing episodes of the Galactic bulge stars will strongly display the binary nature of the lens. The effect is strong even if the companion is a planet. A massive search for microlensing of the Galactic bulge stars may lead to a discovery of the first extrasolar planetary systems.

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