NASA NTRS · 20205003767
An analysis of binary microlensing event OGLE-2015-BLG-0060
Abstract
We present the analysis of stellar binary microlensing event OGLE-2015-BLG-0060 based on observations obtained from 13 different telescopes. Intensive coverage of the anomalous parts of the light curve was achieved by automated follow-up observations from the robotic telescopes of the Las Cumbres Observatory. We show that, for the first time, all main features of an anomalous microlensing event are well covered by follow-up data, allowing us to estimate the physical parameters of the lens. The strong detection of second-order effects in the event light curve necessitates the inclusion of longer-baseline survey data in order to constrain the parallax vector. We find that the event was most likely caused by a stellar binary-lens with masses M ͙(1) = 0.87 ± 0.12M(☉) and M ͙(2)= 0.77 ± 0.11M(☉). The distance to the lensing system is 6.41 ± 0.14 kpc and the projected separation between the two components is 13.85 ± 0.16 au. Alternative interpretations are also considered.
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Y. Tsapras, A. Cassan, Clement Ranc, E. Bachelet, R. Street, A. Udalski, M. Hundertmark, V. Bozza, J. P. Beaulieu, J. B Marquette, E. Euteneuer, D. M. Bramich, M. Dominik, R. Figuera Jaimes, K. Horne, S. Mao, J. Menzies, R. Schmidt, C. Snodgrass, I. A. Steele, J. Wambsganss, P. Mr´oz, M. K. Szyma´nski, I. Soszy´nski, J. Skowron, P. Pietrukowicz, S. Kozlowski, R. Poleski, K. Ulaczyk, M. Pawlak, U. G. Jorgensen, J. Skottfelt, A. Popovas, S. Ciceri, H. Korhonen, M. Kuffmeier, D.F. Evans, N. Peixinho, T. C. Hinse, M. J. Burgdorf, J. Southworth, R. Tronsgaard, E. Kerins, M. I. Andersen, S. Rahvar, Y. Wang, O. Wertz, M. Rabus, S. Calchi Novati, G. D’Ago, G. Scarpetta, L. Mancini, F. Abe, Y. Asakura, D P Bennett, A Bhattacharya, M. Donachie, P. Evans, A. Fukui, Y. Hirao, Y. Itow, K. Kawasaki, N. Koshimoto, M. C. A. Li, C. H. Ling, K. Masuda, Y. Matsubara, Y. Muraki, S. Miyazaki, M. Nagakane, K. Ohnishi, N. Rattenbury, To. Saito, A. Sharan, H. Shibai, D. J. Sullivan, T. Sumi, D Suzuki, P. J. Tristram, T. Yamada, A. Yonehara. 2019-05-30. An analysis of binary microlensing event OGLE-2015-BLG-0060. https://ntrs.nasa.gov/citations/20205003767
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