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Journal Paper

전체
OGLE-2016-BLG-0263Lb: Microlensing Detection of a Very Low-mass Binary Companion through a Repeating Event Channel SCI
  • C. Han;A. Udalski;Andrew P. Gould;I. A. Bond;M. D. Albrow;정선주;Y. K. Jung;류윤현;I.-G. Shin;J. C. Yee;W. Zhu;차상목;김승리;김동진;이충욱;이용석;박병곤;J. Skowron;P. Mroz;P. Pietrukowicz;S. Kozłowski;R. Poleski;M. K. Szymanski;I. Soszynski;K. Ulaczyk;M. Pawlak;F. Abe;Y. Asakura;R. Barry;D. P. Bennett;A. Bhattacharya;M. Donachie;P. Evans;A. Fukui;Y. Hirao;Y. Itow;N. Koshimoto;M. C. A. Li;C. H. Ling;K. Masuda;Y. Matsubara;Y. Muraki;M. Nagakane;K. Ohnishi;C. Ranc;N. J. Rattenbury;To. Saito;A. Sharan;D. J. Sullivan;T. Sumi;D. Suzuki;P. J. Tristram;T. Yamada;T. Yamada;A. Yonehara
  • 2017-10-01
  • THE ASTRONOMICAL JOURNAL 154 4 : 133-1~133-9
We report the discovery of a planet-mass companion to the microlens OGLE-2016-BLG-0263L. Unlike most lowmass companions that were detected through perturbations to the smooth and symmetric light curves produced by the primary, the companion was discovered through the channel of a repeating event, in which the companion itself produced its own single-mass light curve after the event produced by the primary had ended. Thanks to the continuous coverage of the second peak by high-cadence surveys, the possibility of the repeating nature due to source binarity is excluded with a 96% confidence level. The mass of the companion estimated by a Bayesian analysis is Mp 4.1 2.5 M 6.5 = - J + . The projected primary-companion separation is a 6.5 1.9 = 1.3 ^ - + au. The ratio of the separation to the snow-line distance of a^ asl ~ 15.4 corresponds to the region beyond Neptune, the outermost planet of the solar system. We discuss the importance of high-cadence surveys in expanding the range of microlensing detections of low-mass companions and future space-based microlensing surveys.