3 citations · 3 across the 1 of their papers we have counts for
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Prospects for the Detection of Earth-Mass Planets
Andrew Gould, B. Scott Gaudi, Cheongho Han
We compare potential state-of-the-art experiments for detecting Earth-mass planets around main-sequence stars using radial velocities, transits, astrometry, and microlensing. For c…
Effect of a wide binary companion to the lens on the astrometric behavior of gravitational microlensing events
Jin H. An, Cheongho Han
In this paper, we investigate the effect of a wide binary companion of the lens on the astrometric behavior of Galactic gravitational microlensing events and compare it to the effe…
Detectability of the Parallax-induced Deviations in the Astrometric Centroid Shift Trajectories of Gravitational Microlensing Events
Cheongho Han, Kyongae Chang
The uncertainty of the lens mass can be substantially reduced if it is determined from the lens proper motion obtained from astrometric measurements of the source image centroid sh…
Additional Information from Astrometric Gravitational Microlensing Observations
Cheongho Han
Astrometric observations of microlensing events were originally proposed to determine the lens proper motion with which the physical parameters of lenses can be better constrained.…
Better Astrometric Deblending of Gravitional Microlensing Events by Using the Difference Image Analysis Method
Cheongho Han
Due to the choice of very dense star fields for a higher event rate, the current microlensing searches suffer from large uncertainties caused by blending effect. To measure light v…
Unique Determination of the Physical Parameters of Individual MACHOs from Astrometric Parallax Measurements
Cheongho Han
The Einstein time scale, which is the only information obtained from current microlensing experiments, results from a complicated combination of the lens parameters that we want to…