Discovering planetary systems through gravitational microlenses

Details Discovering planetary systems through gravitational microlenses Discovering planetary systems through gravitational microlenses

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...396..104g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 396, no. 1, Sept. 1, 1992, p. 104-114. Research supported by W.M. Keck Foun

Mathematics

Probability

254

Galactic Bulge, Gravitational Lenses, Light Curve, Milky Way Galaxy, Planetary Systems, Variable Stars, Galactic Nuclei, Main Sequence Stars

Scientific paper

Planetary systems of Galactic disk stars can be detected as microlenses of stars in the Galactic bulge. Planets in a solar-like system positioned half-way to the Galactic center should leave a noticeable signature (magnification larger than 5 percent) on the light curve of a gravitationally lensed bulge star in about 20 percent of the microlensing events. This high probability results from a coincidence between Jupiter's orbital radius and the solar Einstein radius at this distance. Typical planetary signals last for about 1 day, a small fraction of the approximately 1 month duration of the entire microlensing event. Dedicated monitoring of microlensing candidates is suggested as a method to discover planetary systems in conjunction with forthcoming observations toward the Galactic bulge.

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