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11 papers · 1 filter
Direct Lens Imaging of Galactic Bulge Microlensing Events
Cheongho Han, Heon-Young Chang
Recently, from the Hubble Space Telescope (HST) images of one of the Large Magellanic Cloud (LMC) events taken 6.3 years after the original lensing measurement, Alcock et al. were…
Probing Structures of Distant Extrasolar Planets with Microlensing
B. Scott Gaudi, Heon-Young Chang, Cheongho Han
Planetary companions to the source stars of a caustic-crossing binary microlensing events can be detected via the deviation from the parent light curves created when the caustic ma…
Angular Radii of Stars via Microlensing
B. Scott Gaudi, David S. Graff, Cheongho Han
We outline a method by which the angular radii of giant and main sequence stars in the Galactic bulge can be measured to a few percent accuracy. The method combines ground-based ph…
On the Feasibility of Detecting Satellites of Extrasolar Planets via Microlensing
Cheongho Han, Wonyong Han
Although many methods of detecting extra-solar planets have been proposed and successful implementation of some of these methods enabled a rapidly increasing number of exoplanet de…
Dynamic instabilities induced by asymmetric influence: Prisoners' dilemma game on small-world networks
Beom Jun Kim, Ala Trusina, Petter Holme +3
A two-dimensional small-world type network, subject to spatial prisoners' dilemma dynamics and containing an influential node defined as a special node with a finite density of dir…
Astrometric Microlensing: A Channel to Detect Multiple Lens Systems
Cheongho Han
If a source star is gravitationally microlensed by a multiple lens system, the resulting light curve can have significant deviations from the standard form of a single lens event.…