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OGLE-2016-BLG-0156: Microlensing Event with Pronounced Microlens-parallax Effects Yielding a Precise Lens Mass Measurement
- Source :
- The Astrophysical Journal. 872(2)
- Publication Year :
- 2019
- Publisher :
- United States: NASA Center for Aerospace Information (CASI), 2019.
-
Abstract
- We analyze the gravitational binary-lensing event OGLE-2016-BLG-0156, for which the lensing light curve displays pronounced deviations induced by microlens-parallax effects. The light curve exhibits three distinctive widely separated peaks and we find that the multiple-peak feature provides a very tight constraint on the microlens-parallax effect, enabling us to precisely measure the microlens parallax . All the peaks are densely and continuously covered from high-cadence survey observations using globally located telescopes and the analysis of the peaks leads to the precise measurement of the angular Einstein radius . From the combination of the measured and , we determine the physical parameters of the lens. It is found that the lens is a binary composed of two M dwarfs with masses M(1) = 0.18 ± 0.01 M(⊙) and M(2) = 0.16 ± 0.01 M(⊙) located at a distance D(L) = 1.35 ± 0.09 kpc. According to the estimated lens mass and distance, the flux from the lens comprises an important fraction, ~25%, of the blended flux. The bright nature of the lens combined with the high relative lens-source motion, μ = 6.94 ± 0.50 mas/yr, suggests that the lens can be directly observed from future high-resolution follow-up observations.
- Subjects :
- Astrophysics
Subjects
Details
- Language :
- English
- ISSN :
- 15384357 and 0004637X
- Volume :
- 872
- Issue :
- 2
- Database :
- NASA Technical Reports
- Journal :
- The Astrophysical Journal
- Notes :
- 134180.04.04.01, , 2017R1A4A1015178, , AST- 1516842, , ERC 321035, , 80NSSC18K0274
- Publication Type :
- Report
- Accession number :
- edsnas.20205002540
- Document Type :
- Report
- Full Text :
- https://doi.org/10.3847/1538-4357/ab001f