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Ground-based parallax confirmed by Spitzer: binary microlensing event MOA-2015-BLG-020

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We present the analysis of the binary gravitational microlensing event MOA-2015-BLG-020. The event has a fairly long timescale (∼63 days) and thus the light curve deviates significantly from the lensing model that is based on the rectilinear lens-source relative motion. This enables us to measure th...

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Main Authors: Wang, Tianyu (Author) , Tsapras, Yiannis (Author) , Hundertmark, Markus (Author) , Wambsganß, Joachim (Author) , Schmidt, Robert W. (Author)
Format: Article (Journal)
Language:English
Published: 2017 August 18
In: The astrophysical journal
Year: 2017, Volume: 845, Issue: 2
ISSN:1538-4357
DOI:10.3847/1538-4357/aa813b
Online Access:Verlag, kostenfrei, Volltext: http://dx.doi.org/10.3847/1538-4357/aa813b
Verlag, kostenfrei, Volltext: http://stacks.iop.org/0004-637X/845/i=2/a=129
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Author Notes:Tianshu Wang, Wei Zhu, Shude Mao, I.A. Bond, A. Gould, A. Udalski, T. Sumi, V. Bozza, C. Ranc, A. Cassan, J.C. Yee, C. Han, F. Abe, Y. Asakura, R. Barry, 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, S. Miyazaki, Y. Muraki, M. Nagakane, K. Ohnishi, N. Rattenbury, To Saito, A. Sharan, H. Shibai, D.J. Sullivan, D. Suzuki, P.J. Tristram, T. Yamada, A. Yonehara, M. O. A. Collaboration, S. KozŁowski, P. Mróz, M. Pawlak, P. Pietrukowicz, R. Poleski, J. Skowron, I. Soszyński, M.K. Szymański, K. Ulaczyk, OGLE Collaboration, C. Beichman, G. Bryden, S. Calchi Novati, S. Carey, M. Fausnaugh, B.S. Gaudi, C.B. Henderson, Y. Shvartzvald, B. Wibking, Spitzer Team, M.D. Albrow, S.-J. Chung, K.-H. Hwang, Y.K. Jung, Y.-H. Ryu, I.-G. Shin, S.-M. Cha, D.-J. Kim, H.-W. Kim, S.-L. Kim, C.-U. Lee, Y. Lee, B.-G. Park, R.W. Pogge, KMTNet Collaboration, R.A. Street, Y. Tsapras, M. Hundertmark, E. Bachelet, M. Dominik, K. Horne, R. Figuera Jaimes, J. Wambsganss, D.M. Bramich, R. Schmidt, C. Snodgrass, I.A. Steele, J. Menzies, RoboNet Collaboration
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Summary:We present the analysis of the binary gravitational microlensing event MOA-2015-BLG-020. The event has a fairly long timescale (∼63 days) and thus the light curve deviates significantly from the lensing model that is based on the rectilinear lens-source relative motion. This enables us to measure the microlensing parallax through the annual parallax effect. The microlensing parallax parameters constrained by the ground-based data are confirmed by the Spitzer observations through the satellite parallax method. By additionally measuring the angular Einstein radius from the analysis of the resolved caustic crossing, the physical parameters of the lens are determined. It is found that the binary lens is composed of two dwarf stars with masses ##IMG## [http://ej.iop.org/images/0004-637X/845/2/129/apjaa813bieqn1.gif] $M_1=0.606\pm 0.028\,M_ødot $ and ##IMG## [http://ej.iop.org/images/0004-637X/845/2/129/apjaa813bieqn2.gif] $M_2=0.125\,\pm 0.006\,M_ødot $ in the Galactic disk. Assuming that the source star is at the same distance as the bulge red clump stars, we find the lens is at a distance ##IMG## [http://ej.iop.org/images/0004-637X/845/2/129/apjaa813bieqn3.gif] $D_L=2.44\pm 0.10\,\mathrmkpc$ . We also provide a summary and short discussion of all of the published microlensing events in which the annual parallax effect is confirmed by other independent observations.
Item Description:Gesehen am 15.09.2017
Physical Description:Online Resource
ISSN:1538-4357
DOI:10.3847/1538-4357/aa813b

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