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On the Astrometric Behavior of Binary Microlensing Events
Cheongho Han
Despite the suspected binarity for a significant fraction of Galactic lenses, the current photometric surveys detected binary microlensing events only for a small fraction of the t…
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…
Comparison of the Two Followup Observation Strategies for Gravitational Microlensing Planet Searches
Cheongho Han, Yong-Gi Kim
There are two different strategies of followup observations for the detection of planets by using microlensing. One is detecting the light curve anomalies affected by the planetary…
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…
Detection of Stellar Spots from the Observations of Caustic-Crossing Binary-Lens Gravitational Microlensing Events
Cheongho Han, Ho-Il Kim, Kyungae Chang +1
Recently, Heyrovský & Sasselov (1999) investigated the sensitivity of {\it single-lens} gravitational microlensing event light curves to small spots and found that during source tr…