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Detection of stellar spots from the observations of caustic-crossing binary-lens gravitational microlensing events
Authors:Cheongho Han  Seong-Hong Park  Ho-Il Kim  Kyongae Chang
Institution:Department of Astronomy &Space Science, Chungbuk National University, Chongju, Korea 361-763;Korea Astronomy Observatory, Taejon, Korea 305-348;Department of Physics, Chongju University, Chongju, Korea 360-764
Abstract:Recently, Heyrovský & Sasselov investigated the sensitivity of single-lens gravitational microlensing event light curves to spots and found that, during source transit, spots can cause deviations in amplification larger than 2 per cent, and thus be detectable. In this paper, we explore the feasibility of spot detection from the observations of binary-lens microlensing events instead of single-lens events. For this we investigate the sensitivity of binary-lens event light curves to spots and compare it with that of single-lens events. From this investigation, we find that during caustic crossings the fractional amplification deviations of light curves from those of spotless source events are equivalent to those of single-lens events, implying that spots can also be detected with a similar photometric precision to that required for spot detection by observing single-lens events. We discuss the relative advantages of observing binary-lens events over the observations of single-lens events in detecting stellar spots.
Keywords:stars: activity  binaries: general  gravitational lensing
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