The Bulletin of The Korean Astronomical Society (천문학회보)
- Volume 37 Issue 2
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- Pages.108.2-108.2
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- 2012
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- 1226-2692(pISSN)
DETECTION OF WIDE PLANETARY SYSTEM WITH MICROLENSING
- Ryu, Yoon-Hyun (Department of Astronomy and Atmospheric Sciences, Kyungpook National University) ;
- Park, Myeong-Gu (Department of Astronomy and Atmospheric Sciences, Kyungpook National University) ;
- Chang, Heon-Young (Department of Astronomy and Atmospheric Sciences, Kyungpook National University) ;
- Lee, Ki-Won (Institute of Liberal Education, Catholic University of Daegu)
- Published : 2012.10.17
Abstract
Recent results from microlensing surveys show that a free-floating planet or a wide-separation planet is more numerous than a main-sequence star in the Galaxy. Moreover, the detection efficiency of the planets will be improved in next-generation experiments with a high survey monitoring frequency. However, microlensing events produced by both planets appear similar light curves with a short duration timescale, thus it is difficult to distinguish them. In this paper, we investigated the detectable separation range of a wide-separation planet as the planet bound to its host star. We construct the fractional deviation maps using the magnifications of the planetary lensing and the single-lensing by planet itself for various parameters such as a mass ratio, separation, and source radius. As a result, we found that the pattern of the fractional deviation is related to the ratio of source radius to caustic size, and the ratio satisfying the detection criterion (i.e.,
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