THE IMPORTANCE OF BINARY GRAVITATIONAL MICROLENSING EVENTS THROUGH HIGH-MAGNIFICATION CHANNEL
- Department of Physics, Chungbuk National University, Cheongju 361-763 (Korea, Republic of)
We estimate the detection efficiency of binary gravitational lensing events through the channel of high-magnification events. From this estimation, we find that binaries in the separation ranges of 0.1 approx< s approx< 10, 0.2 approx< s approx< 5, and 0.3 approx< s approx< 3 can be detected with approx100% efficiency for events with magnifications higher than A = 100, 50, and 10, respectively, where s represents the projected separation between the lens components normalized by the Einstein radius. We also find that the range of high efficiency covers nearly the whole mass-ratio range of stellar companions. Due to the high efficiency in wide ranges of parameter space, we point out that the majority of binary-lens events will be detected through the high-magnification channel in lensing surveys that focus on high-magnification events for efficient detections of microlensing planets. In addition to the high efficiency, the simplicity of the efficiency estimation makes the sample of these binaries useful in the statistical studies of the distributions of binary companions as functions of mass ratio and separation. We also discuss other implications of these events.
- OSTI ID:
- 21392575
- Journal Information:
- Astrophysical Journal, Vol. 707, Issue 2; Other Information: DOI: 10.1088/0004-637X/707/2/1264; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
Similar Records
FREQUENCY OF SOLAR-LIKE SYSTEMS AND OF ICE AND GAS GIANTS BEYOND THE SNOW LINE FROM HIGH-MAGNIFICATION MICROLENSING EVENTS IN 2005-2008
A Likely Detection of a Two-planet System in a Low-magnification Microlensing Event