OGLE-2014-BLG-0289: Precise Characterization of a Quintuple-peak Gravitational Microlensing Event

January 2018 • 2018ApJ...853...70U

Authors • Udalski, A. • Han, C. • Bozza, V. • Gould, A. • Bond, I. A. • and • Mróz, P. • Skowron, J. • Wyrzykowski, Ł. • Szymański, M. K. • Soszyński, I. • Ulaczyk, K. • Poleski, R. • Pietrukowicz, P. • Kozłowski, S. • OGLE Collaboration • 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. • Masuda, K. • 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. • MOA Collaboration • Street, R. A. • Tsapras, Y. • Bachelet, E. • Bramich, D. M. • DÁgo, G. • Dominik, M. • Figuera Jaimes, R. • Horne, K. • Hundertmark, M. • Kains, N. • Menzies, J. • Schmidt, R. • Snodgrass, C. • Steele, I. A. • Wambsganss, J. • Robonet Collaboration • Pogge, R. W. • Jung, Y. K. • Shin, I. -G. • Yee, J. C. • Kim, W. -T. • μFun Collaboration • Beichman, C. • Carey, S. • Calchi Novati, S. • Zhu, W. • Spitzer Team

Abstract • We present the analysis of the binary-microlensing event OGLE-2014-BLG-0289. The event light curve exhibits five very unusual peaks, four of which were produced by caustic crossings and the other by a cusp approach. It is found that the quintuple-peak features of the light curve provide tight constraints on the source trajectory, enabling us to precisely and accurately measure the microlensing parallax {π }_{{E}}. Furthermore, the three resolved caustics allow us to measure the angular Einstein radius {θ }_{{E}}. From the combination of {π }_{{E}} and {θ }_{{E}}, the physical lens parameters are uniquely determined. It is found that the lens is a binary composed of two M dwarfs with masses {M}₁=0.52+/- 0.04 {M}_⊙ and {M}₂=0.42+/- 0.03 {M}_⊙ separated in projection by {a}_\perp =6.4+/- 0.5 {au}. The lens is located in the disk with a distance of {D}_{{L}}=3.3+/- 0.3 {kpc}. The reason for the absence of a lensing signal in the Spitzer data is that the time of observation corresponds to the flat region of the light curve.

Links

• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2018ApJ...853...70U
• PDF https://iopscience.iop.org/article/10.3847/1538-4357/aaa295/pdf
• PDF https://stacks.iop.org/0004-637X/853/70/pdf
• PREPRINT http://arxiv.org/abs/1801.05084
• DATA https://irsa.ipac.caltech.edu/bibdata/2018/U/2018ApJ...853...70U.html
• ELECTR https://doi.org/10.3847%2F1538-4357%2Faaa295