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OGLE-2016-BLG-0156: Microlensing Event with Pronounced Microlens-parallax Effects Yielding a Precise Lens Mass Measurement

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Název: OGLE-2016-BLG-0156: Microlensing Event with Pronounced Microlens-parallax Effects Yielding a Precise Lens Mass Measurement
Autoři: Jung, Y., Han, C., Bond, I., Udalski, A., Gould, A., authors, L., Albrow, M., Chung, S., Hwang, K., Lee, C., Ryu, Y., Shin, I., Shvartzvald, Y., Yee, J., Jee, M., Kim, D., Cha, S., Kim, H., Kim, S., Lee, D., Lee, Y., Park, B., Pogge, R., Collaboration, K., Abe, F., Barry, R., Bennett, D., Bhattacharya, A., Donachie, M., Fukui, A., Hirao, Y., Itow, Y., Kawasaki, K., Kondo, I., Koshimoto, N., Li, M., Matsubara, Y., Muraki, Y., Miyazaki, S., Nagakane, M., Ranc, C., Rattenbury, N., Suematsu, H., Sullivan, D., Sumi, T., Suzuki, D., Tristram, P., Yonehara, A., Collaboration, T., Mróz, P., Poleski, R., Skowron, J., Szymański, M., Soszyński, I., Kozłowski, S., Pietrukowicz, P., Ulaczyk, K., Pawlak, M.
Zdroj: The Astrophysical Journal
Informace o vydavateli: 2019.
Rok vydání: 2019
Popis: 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 {π }{{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 {θ }{{E}}. From the combination of the measured {π }{{E}} and {θ }{{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 ± 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-1, suggests that the lens can be directly observed from future high-resolution follow-up observations.
Druh dokumentu: Article
Přístupová URL adresa: http://hdl.handle.net/21.11116/0000-0005-D0C6-0
Přístupové číslo: edsair.od......1874..d657bfc744f76c6542d78fbeeeeef23c
Databáze: OpenAIRE
Popis
Abstrakt: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 {π }{{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 {θ }{{E}}. From the combination of the measured {π }{{E}} and {θ }{{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 ± 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-1, suggests that the lens can be directly observed from future high-resolution follow-up observations.