Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-11-14
Astronomy and Astrophysics
Astrophysics
9 pages includes 8 postscript figures, AAS Latex, submitted to ApJ
Scientific paper
10.1086/307628
We introduce a new method of searching for and characterizing extra-solar planets. We show that by monitoring the center-of-light motion of microlensing alerts using the next generation of high precision astrometric instruments the probability of detecting a planet orbiting the lens is high. We show that adding astrometric information to the photometric microlensing lightcurve greatly helps in determining the planetary mass and semi-major axis. We introduce astrometric maps as a new way for calculating astrometric motion and planet detection probabilities. Finite source effects are important for low mass planets, but even Earth mass planets can give detectable signals.
Dalal Neal
Griest Kim
Safizadeh Neda
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