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OGLE-2016-BLG-1003: First Resolved Caustic-crossing Binary-source Event Discovered by Second-generation Microlensing Surveys

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posted on 2018-05-15, 14:05 authored by Y. K. Jung, A. Udalski, I. A. Bond, J. C. Yee, A. Gould, C. Han, M. D. Albrow, C. U. Lee, S. L. Kim, K. H. Hwang, S. J. Chung, Y. H. Ryu, I. G. Shin, W. Zhu, S. M. Cha, D. J. Kim, Y. Lee, B. G. Park, H. W. Kim, R. W. Pogge, J. Skowron, M. K. Szymański, R. Poleski, P. Mróz, S. Kozłowski, P. Pietrukowicz, I. Soszyński, K. Ulaczyk, M. Pawlak, F. Abe, D. P. Bennett, R. Barry, T. Sumi, Y. Asakura, A. Bhattacharya, M. Donachie, A. Fukui, Y. Hirao, Y. Itow, N. Koshimoto, M .C. A. Li, C. H. Ling, K. Masuda, Y. Matsubara, Y. Muraki, M. Nagakane, N. J. Rattenbury, Philip Evans, A. Sharan, D. J. Sullivan, D. Suzuki, P. J. Tristram, T. Yamada, A. Yonehara
We report the analysis of the first resolved caustic-crossing binary-source microlensing event OGLE-2016-BLG-1003. The event is densely covered by round-the-clock observations of three surveys. The light curve is characterized by two nested caustic-crossing features, which is unusual for typical caustic-crossing perturbations. From the modeling of the light curve, we find that the anomaly is produced by a binary source passing over a caustic formed by a binary lens. The result proves the importance of high-cadence and continuous observations, and the capability of second-generation microlensing experiments to identify such complex perturbations that are previously unknown. However, the result also raises the issues of the limitations of current analysis techniques for understanding lens systems beyond two masses and of determining the appropriate multiband observing strategy of survey experiments.

History

Citation

Astrophysical Journal, 2017, 841 (2)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

  • VoR (Version of Record)

Published in

Astrophysical Journal

Publisher

American Astronomical Society

issn

0004-637X

eissn

1538-4357

Copyright date

2017

Available date

2018-05-15

Publisher version

http://iopscience.iop.org/article/10.3847/1538-4357/aa7057/meta

Language

en

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