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7 papers · 1 filter
Gravitational Microlensing: A Tool for Detecting and Characterizing Free-Floating Planets
Cheongho Han, Sun-Ju Chung, Doeon Kim +4
Various methods have been proposed to search for extrasolar planets. Compared to the other methods, microlensing has unique applicabilities to the detections of Earth-mass and free…
OGLE-2003-BLG-262: Finite-Source Effects from a Point-Mass Lens
Jaiyul Yoo, D. L. DePoy, A. Gal-Yam +16
We analyze OGLE-2003-BLG-262, a relatively short, t_E=12.5+-0.1day, microlensing event generated by a point-mass lens transiting the face of a K giant source in the Galactic bulge.…
Signs of Planetary Microlensing Signals
Cheongho Han, Kyongae Chang
An extrasolar planet can be detected via microlensing from the perturbation it makes in the smooth lensing light curve of the primary. In addition to the conventional photometric m…
Resolving the Microlens Mass Degeneracy for Earth-Mass Planets
Andrew Gould, B. Scott Gaudi, Cheongho Han
Of all planet-finding techniques, microlensing is potentially the most sensitive to Earth-mass planets. However, microlensing lightcurves generically yield only the planet-star mas…
The energy-carrying velocity and rolling of tachyons of unstable D-branes
Jin Hyun Chung, Won Sik L'Yi
It is shown that the tachyons which originate from unstable D-branes carry energy and momentum at the velocity where is the phase velocity which is greater than $c.…
Probing the Spatial Distribution of Extrasolar Planets with Gravitational Microlensing
Cheongho Han, Young Woon Kang
Under the current microlensing planet search strategy of monitoring events caused by stellar-mass lenses, only planets located within a narrow region of separations from central st…