Astrometric Microlensing as a Method of Discovering and Characterizing Extra-Solar Planets
arXiv:astro-ph/9811233 · doi:10.1086/307628
Abstract
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.
9 pages includes 8 postscript figures, AAS Latex, submitted to ApJ
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Cited by in corpus (22)
- Extra-Solar Planets
- Astrometric Image Centroid Displacements due to Gravitational Microlensing by the Ellis Wormhole
- Properties of Microlensing Light Curve Anomalies Induced by Multiple Planets
- Microlensing Searches for Exoplanets
- Astrometric Microlensing of Quasars : Dependence on surface mass density and external shear
- Properties of Planet-induced Deviations in the Astrometric Microlensing Centroid Shift Trajectory
- Perturbative approach to the astrometric microlensing due to an extrasolar planet
- Astrometric Method to Break the Photometric Degeneracy between Binary-source and Planetary Microlensing Perturbations
- Microlensed image centroid motions by an exotic lens object with negative convergence or negative mass
- Astrometric precision of observations at VLT/FORS2
- Gravitational lensing by exotic objects
- Microlensing Events by Proxima Centauri in 2014 and 2016: Opportunities for Mass Determination and Possible Planet Detection
- High-precision astrometry on the VLT/FORS1 at time scales of few days
- A public code for astrometric microlensing with contour integration
- Trajectories of the images in binary microlensing
- Astrometric microlensing
- Parallax and orbital effects in astrometric microlensing with binary sources
- Perturbation theory of N point-mass gravitational lens systems without symmetry: small mass-ratio approximation
- Signs of Planetary Microlensing Signals
- Spectro-photometric variability of quasars caused by lensing of diffuse massive substructure: Consequences on flux anomaly and precise astrometric measurements
- Astrometric imaging of crowded stellar fields with only two SIM pointings
- Never bet against Einstein