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

OGLE-2014-BLG-0289: Precise Characterization of a Quintuple-peak Gravitational Microlensing Event
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DOI：
10.3847/1538-4357/aaa295
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发表时间：
2018-01
期刊：
The Astrophysical Journal
影响因子：
--
通讯作者：
A. Udalski;C. Han;V. Bozza;A. Gould;I. Bond;P. Mr'oz;J. Skowron;Ł. Wyrzykowski;M. Szyma'nski;I. Soszy'nski;K. Ulaczyk;R. Poleski;P. Pietrukowicz;S. Kozłowski;F. Abe;R. Barry;D. Bennett;A. Bhattacharya;M. Donachie;P. Evans;A. Fukui;Y. Hirao;Y. Itow;K. Kawasaki;N. Koshimoto;M. Li;C. Ling;K. Masuda;Y. Matsubara;S. Miyazaki;H. Munakata;Y. Muraki;M. Nagakane;K. Ohnishi;C. Ranc;N. Rattenbury;T. Saito;A. Sharan;D. Sullivan;T. Sumi;D. Suzuki;P. Tristram;T. Yamada;A. Yonehara;R. Street;Y. Tsapras;E. Bachelet;D. Bramich;G. D’ago;M. Dominik;R. Jaimes;K. Horne;M. Hundertmark;N. Kains;J. Menzies;R. Schmidt;C. Snodgrass;I. Steele;J. Wambsganss;R. Pogge;Y. Jung;I. Shin;J. Yee;W. Kim;C. Beichman;S. Carey;S. Novati;W. Zhu
A. Udalski;C. Han;V. Bozza;A. Gould;I. Bond;P. Mr'oz;J. Skowron;Ł. Wyrzykowski;M. Szyma'nski;I. Soszy'nski;K. Ulaczyk;R. Poleski;P. Pietrukowicz;S. Kozłowski;F. Abe;R. Barry;D. Bennett;A. Bhattacharya;M. Donachie;P. Evans;A. Fukui;Y. Hirao;Y. Itow;K. Kawasaki;N. Koshimoto;M. Li;C. Ling;K. Masuda;Y. Matsubara;S. Miyazaki;H. Munakata;Y. Muraki;M. Nagakane;K. Ohnishi;C. Ranc;N. Rattenbury;T. Saito;A. Sharan;D. Sullivan;T. Sumi;D. Suzuki;P. Tristram;T. Yamada;A. Yonehara;R. Street;Y. Tsapras;E. Bachelet;D. Bramich;G. D’ago;M. Dominik;R. Jaimes;K. Horne;M. Hundertmark;N. Kains;J. Menzies;R. Schmidt;C. Snodgrass;I. Steele;J. Wambsganss;R. Pogge;Y. Jung;I. Shin;J. Yee;W. Kim;C. Beichman;S. Carey;S. Novati;W. Zhu
中科院分区：
其他
文献类型：
--
作者：
A. Udalski;C. Han;V. Bozza;A. Gould;I. Bond;P. Mr'oz;J. Skowron;Ł. Wyrzykowski;M. Szyma'nski;I. Soszy'nski;K. Ulaczyk;R. Poleski;P. Pietrukowicz;S. Kozłowski;F. Abe;R. Barry;D. Bennett;A. Bhattacharya;M. Donachie;P. Evans;A. Fukui;Y. Hirao;Y. Itow;K. Kawasaki;N. Koshimoto;M. Li;C. Ling;K. Masuda;Y. Matsubara;S. Miyazaki;H. Munakata;Y. Muraki;M. Nagakane;K. Ohnishi;C. Ranc;N. Rattenbury;T. Saito;A. Sharan;D. Sullivan;T. Sumi;D. Suzuki;P. Tristram;T. Yamada;A. Yonehara;R. Street;Y. Tsapras;E. Bachelet;D. Bramich;G. D’ago;M. Dominik;R. Jaimes;K. Horne;M. Hundertmark;N. Kains;J. Menzies;R. Schmidt;C. Snodgrass;I. Steele;J. Wambsganss;R. Pogge;Y. Jung;I. Shin;J. Yee;W. Kim;C. Beichman;S. Carey;S. Novati;W. Zhu

文献摘要

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我们对双微透镜事件OGLE-2014-BLG-0289进行了分析。事件光曲线表现出五个非常不寻常的峰，其中四个是由苛性交叉产生的，另一个是由尖峰接近产生的。发现光曲线的五峰特征对光源轨迹提供了严格的约束，使我们能够精确地测量微透镜视差π E。此外，三个分解的焦散使我们能够测量角爱因斯坦半径θ E。从π E和θ E的组合可以唯一确定物理透镜的参数。发现透镜是由两个质量m1 = 0.52±0.04 M⊙和m2 = 0.42±0.03 M⊙的M矮星组成的双星，它们在投影上被a⊥= 6.4±0.5 au隔开。透镜位于圆盘上，距离为dl = 3.3±0.3 kpc。斯皮策数据中没有透镜信号的原因是观测时间对应于光曲线的平坦区域。
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 ⊥ = 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.