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OGLE-2016-BLG-0156: Microlensing Event With Pronounced Microlens-Parallax Effects Yielding Precise Lens Mass Measurement
- Publication Year :
- 2019
- Publisher :
- arXiv, 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 3 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 $\pi_{\rm E}$. 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 $\theta_{\rm E}$. From the combination of the measured $\pi_{\rm E}$ and $\theta_{\rm E}$, we determine the physical parameters of the lens. It is found that the lens is a binary composed of two M dwarfs with masses $M_1=0.18\pm 0.01\ M_\odot$ and $M_2=0.16\pm 0.01\ M_\odot$ located at a distance $D_{\rm L}= 1.35\pm 0.09\ {\rm kpc}$. According to the estimated lens mass and distance, the flux from the lens comprises an important fraction, $\sim 25\%$, of the blended flux. The bright nature of the lens combined with the high relative lens-source motion, $\mu=6.94\pm 0.50\ {\rm mas}\ {\rm yr}^{-1}$, suggests that the lens can be directly observed from future high-resolution follow-up observations.<br />Comment: 9 pages, 9 figures
- Subjects :
- 010504 meteorology & atmospheric sciences
Flux
FOS: Physical sciences
gravitational lensing: micro
Astrophysics
Gravitational microlensing
01 natural sciences
law.invention
Einstein radius
Gravitation
law
0103 physical sciences
010303 astronomy & astrophysics
Solar and Stellar Astrophysics (astro-ph.SR)
0105 earth and related environmental sciences
Physics
Microlens
Earth and Planetary Astrophysics (astro-ph.EP)
Astronomy and Astrophysics
Light curve
Lens (optics)
Astrophysics - Solar and Stellar Astrophysics
binaries: general
Space and Planetary Science
Parallax
Astrophysics - Earth and Planetary Astrophysics
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....aa8eabd16fea69fa6268d7c6423d9f51
- Full Text :
- https://doi.org/10.48550/arxiv.1901.06457