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Journal Article

KMT-2016-BLG-1820 and KMT-2016-BLG-2142: Two Microlensing Binaries Composed of Planetary-mass Companions and Very-low-mass Primaries

MPS-Authors

Jung,  Youn Kil
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;

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

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

Han,  Cheongho
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;

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;

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

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

Zang,  Weicheng
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,  Dong-Jin
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;

Kim,  Seung-Lee
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;

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;

External Resource

https://ui.adsabs.harvard.edu/abs/2018AJ....156..208J
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Citation

Jung, Y. K., Hwang, K.-H., Ryu, Y.-H., Gould, A., Han, C., Yee, J. C., et al. (2018). KMT-2016-BLG-1820 and KMT-2016-BLG-2142: Two Microlensing Binaries Composed of Planetary-mass Companions and Very-low-mass Primaries. The Astronomical Journal, 156.


Cite as: https://hdl.handle.net/21.11116/0000-0005-CCF4-2
Abstract
We present the analyses of two short-timescale ({t}{{E}}̃ 5 {days}) microlensing events, KMT-2016-BLG-1820 and KMT-2016-BLG-2142. In both light curves, the brief anomalies were clearly captured and densely covered by the Korea Microlensing Telescope Network survey. From these analyses, we find that both events have small Einstein radii of {θ }{{E}}=0.12 {mas}, suggesting that the binary-lens systems are composed of very-low-mass components and/or are located much closer to the lensed stars than to Earth. From Bayesian analyses, we find that these binaries have total system masses of {0.043}-0.018+0.043 {M}☉ and {0.088}-0.041+0.120 {M}☉ , implying that they are well within the very-low-mass regime. The estimated lens- component masses indicate that the binary lenses consist of a giant- planet/brown-dwarf pair (KMT-2016-BLG-1820) and a dark/faint object pair (KMT-2016-BLG-2140) that are located near the deuterium-burning and hydrogen-burning mass limits, respectively. Both lens systems are likely to be in the Galactic disk with estimated distances of about 6 and 7 kpc. The projected lens-components separations are 1.1 and 0.8 au, and the mass ratios are 0.11 and 0.20. These prove that the microlensing method is effective to identify these closely separated very-low-mass binaries having low mass-ratios.