Sun-Ju Chung

TL;DR: In this paper, the authors derived analytic expressions for the location, size, and shape of the central caustic as a function of the star-planet separation, s, and the planet/star mass ratio, q, under the planetary perturbative approximation and compared the results with those based on numerical computations.

TL;DR: In this article, an ensemble of microlensing events from the 2015 Spitzer micro-lensing campaign, all of which were densely monitored by ground-based high-cadence survey teams, were analyzed and the planet sensitivities of all 41 events in the sample were calculated, from which compact constraints on the microlens properties were derived, including the uncertainties on the lens mass and distance.

TL;DR: For example, OGLE-2016-BLG-1195Lb as discussed by the authors is the smallest Earth-mass microlensing planet to date, with a value of 3.91 − 0.46 kpc, which is the third consecutive case among the "Galactic distribution" planets toward the Galactic bulge that lies in the Galactic disk as opposed to the bulge itself.

TL;DR: In this paper, the authors presented the discovery of a Neptune-mass free-floating planet candidate in the ultrashort OGLE-2016-BLG-1540 microlensing event.

TL;DR: In this article, the discovery of a giant planet in the OGLE-2017-BLG-1522 microlensing event was reported, and a Bayesian analysis yields component masses of the brown-dwarf/Jupiter system that probably lies in the Galactic bulge.