Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-03-25
Astrophys.J. 573 (2002) 825-828
Astronomy and Astrophysics
Astrophysics
11 pages (LaTeX); accepted for publication in Astrophys. J
Scientific paper
10.1086/340838
We have developed a perturbative approach to microlensing due to an extrasolar planetary lens. In particular, we have found analytic formulae for triple images. We have used the formulae to investigate the astrometric microlensing due to the extrasolar planetary lens, in expectation of dramatic improvements in the precision of the future astrometric measurements. For a weak lensing case, we have shown how the maximum angular size and the typical time scale of the anomalous shift of the lightcentroid are dependent on the mass ratio and angular separation between the star and the planet.
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