3 years ago

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

R.W. Pogge, C. Beichman, A. Sharan, W.-T. Kim, G. DÁgo, C. Snodgrass, N. Rattenbury, A. Fukui, R. Barry, M. Hundertmark, P.J. Tristram, M. Donachie, R. Poleski, K. Ohnishi, N. Koshimoto, K. Horne, S. Miyazaki, Y. Itow, C. Han, Y. Muraki, T. Saito, N. Kains, T. Sumi, Y. Hirao, J. Wambsganss, A. Bhattacharya, I.-G. Shin, S. Kozłowski, T. Yamada, F. Abe, K. Ulaczyk, Y.K. Jung, D.P. Bennett, R. Figuera Jaimes, M. K. Szymański, P. Pietrukowicz, D. Suzuki, K. Kawasaki, D.J. Sullivan, I.A. Bond, M. Nagakane, M. Dominik, V. Bozza, M.C.A. Li, Y. Matsubara, I.A. Steele, P. Evans, A. Udalski, H. Munakata, Ł. Wyrzykowski, A. Yonehara, J. Skowron, A. Gould, K. Masuda, J. Menzies, P. Mróz, J. C. Yee, I. Soszyński, D.M. Bramich, C.H. Ling, E. Bachelet, C. Ranc, R. Schmidt

We present the analysis of the binary-microlensing event OGLE-2014-BLG-0289. The event light curve exhibits very unusual five peaks where four peaks were produced by caustic crossings and the other peak was produced 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 $\pi_{\rm E}$. Furthermore, the three resolved caustics allow us to measure the angular Einstein radius $\thetae$. From the combination of $\pi_{\rm E}$ and $\thetae$, the physical lens parameters are uniquely determined. It is found that the lens is a binary composed of two M dwarfs with masses $M_1 = 0.52 \pm 0.04\ M_\odot$ and $M_2=0.42 \pm 0.03\ M_\odot$ separated in projection by $a_\perp = 6.4 \pm 0.5$ au. The lens is located in the disk with a distance of $D_{\rm L} = 3.3 \pm 0.3$~kpc. It turns out that the reason for the absence of a lensing signal in the {\it Spitzer} data is that the time of observation corresponds to the flat region of the light curve.

Publisher URL: http://arxiv.org/abs/1801.05084

DOI: arXiv:1801.05084v1

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