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Journal Article

KMT-2016-BLG-2052L: Microlensing Binary Composed of M Dwarfs Revealed from a Very Long Timescale Event

MPS-Authors

Han,  Cheongho
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Jung,  Youn Kil
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Shvartzvald,  Yossi
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Albrow,  Michael D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Chung,  Sun-Ju
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gould,  Andrew
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hwang,  Kyu-Ha
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim,  Doeon
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lee,  Chung-Uk
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim,  Woong-Tae
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim,  Hyoun-Woo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ryu,  Yoon-Hyun
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Shin,  In-Gu
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Yee,  Jennifer C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim,  Chun-Hwey
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cha,  Sang-Mok
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim,  Seung-Lee
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim,  Dong-Jin
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lee,  Dong-Joo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lee,  Yongseok
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Park,  Byeong-Gon
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pogge,  Richard W.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Collaboration,  KMTNet
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Beichman,  Charles
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bryden,  Geoff
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Calchi Novati,  Sebastiano
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gaudi,  B. Scott
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Henderson,  Calen B.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Matthew,  T. P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Jacklin,  Savannah R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Team,  The UKIRT Microlensing
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2018ApJ...865...14H
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Citation

Han, C., Jung, Y. K., Shvartzvald, Y., Albrow, M. D., Chung, S.-J., Gould, A., et al. (2018). KMT-2016-BLG-2052L: Microlensing Binary Composed of M Dwarfs Revealed from a Very Long Timescale Event. The Astrophysical Journal, 865.


Cite as: https://hdl.handle.net/21.11116/0000-0005-CD72-4
Abstract
We present the analysis of a binary microlensing event, KMT-2016-BLG-2052, for which the lensing-induced brightening of the source star lasted for two seasons. We determine the lens mass from the combined measurements of the microlens parallax, π E, and angular Einstein radius, θ E. The measured mass indicates that the lens is a binary composed of M dwarfs with masses of M 1 ̃ 0.34 M ☉ and M 2 ̃ 0.17 M ☉. The measured relative lens-source proper motion of μ ̃ 3.9 mas yr-1 is smaller than ̃5 mas yr-1 of typical Galactic lensing events, while the estimated angular Einstein radius of θ E ̃ 1.2 mas is substantially greater than the typical value of ̃0.5 mas. Therefore, it turns out that the long timescale of the event is caused by the combination of the slow μ and large θ E rather than the heavy mass of the lens. From the simulation of Galactic lensing events with very long timescales (t E ≳ 100 days), we find that the probabilities that long timescale events are produced by lenses with masses ≥1.0 M ☉ and ≥3.0 M ☉ are ̃19% and 2.6%, respectively, indicating that events produced by heavy lenses comprise a minor fraction of long timescale events. The results indicate that it is essential to determine lens masses by measuring both π E and θ E in order to firmly identify heavy stellar remnants, such as neutron stars and black holes.