학술논문
OGLE-2017-BLG-0039: Microlensing Event with Light from the Lens Identified from Mass Measurement
Document Type
Working Paper
Author
Han, C.; Jung, Y. K.; Udalski, A.; Bond, I.; Bozza, V.; Albrow, M. D.; Chung, S. -J.; Gould, A.; Hwang, K. -H.; Kim, D.; Lee, C. -U.; Kim, H. -W.; Ryu, Y. -H.; Shin, I. -G.; Yee, J. C.; Shvartzvald, Y.; Cha, S. -M.; Kim, S. -L.; Kim, D. -J.; Lee, D. -J.; Lee, Y.; Park, B. -G.; Pogge, R. W.; Szymański, M. K.; Mróz, P.; Skowron, J.; Poleski, R.; Soszyński, I.; Kozłowski, S.; Pietrukowicz, P.; Ulaczyk, K.; Pawlak, M.; Abe, F.; Barry, R.; Bennett, D. P.; Bhattacharya, A.; Donachie, M.; Evans, P.; Fukui, A.; Hirao, Y.; Itow, Y.; Kawasaki, K.; Koshimoto, N.; Li, M. C. A.; Ling, C. H.; Matsubara, Y.; Miyazaki, S.; Munakata, H.; Muraki, Y.; Nagakane, M.; Ohnishi, K.; Ranc, C.; Rattenbury, N.; Saito, T.; Sharan, A.; Sullivan, D. J.; Sumi, T.; Suzuki, D.; Tristram, P. J.; Yamada, T.; Yonehara, A.
Source
Subject
Language
Abstract
We present the analysis of the caustic-crossing binary microlensing event OGLE-2017-BLG-0039. Thanks to the very long duration of the event, with an event time scale $t_{\rm E}\sim 130$ days, the microlens parallax is precisely measured despite its small value of $\pie\sim 0.06$. The analysis of the well-resolved caustic crossings during both the source star's entrance and exit of the caustic yields the angular Einstein radius $\thetae\sim 0.6$~mas. The measured $\pie$ and $\thetae$ indicate that the lens is a binary composed of two stars with masses $\sim 1.0~M_\odot$ and $\sim 0.15~M_\odot$, and it is located at a distance of $\sim 6$ kpc. From the color and brightness of the lens estimated from the determined lens mass and distance, it is expected that $\sim 2/3$ of the $I$-band blended flux comes from the lens. Therefore, the event is a rare case of a bright lens event for which high-resolution follow-up observations can confirm the nature of the lens.
Comment: 8 pages, 6 figures, 5 tables
Comment: 8 pages, 6 figures, 5 tables