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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 742687.0, MPI für Astronomie / Publikationen_mpia
OGLE-2015-BLG-0196: Ground-based gravitational microlens parallax confirmed by space-based observation
Authors:Han, C.; Udalski, A.; Gould, A.; Zhu, W.; and, nullval; Szymański, M. K.; Soszyński, I.; Skowron, J.; Mróz, P.; Poleski, R.; Pietrukowicz, P.; Kozłowski, S.; Ulaczyk, K.; Pawlak, M.; Collaboration, T. O.; Yee, J. C.; Beichman, C.; Calchi Novati, S.; Carey, S.; Bryden, C.; Fausnaugh, M.; Gaudi, B. S.; Henderson, C. B.; Shvartzvald, Y.; Wibking, B.; Team, T. S. M.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:The Astrophysical Journal
Issue / Number:1
Start Page:id. 82 (8 pp)
Audience:Not Specified
Abstract / Description:In this paper, we present an analysis of the binary gravitational microlensing event OGLE-2015-BLG-0196. The event lasted for almost a year, and the light curve exhibited significant deviations from the lensing model based on the rectilinear lens-source relative motion, enabling us to measure the microlens parallax. The ground-based microlens parallax is confirmed by the data obtained from space-based microlens observations using the Spitzer telescope. By additionally measuring the angular Einstein radius from the analysis of the resolved caustic crossing, the physical parameters of the lens are determined up to the twofold degeneracy, u 0 < 0 and u 0 > 0, solutions caused by the well-known “ecliptic” degeneracy. It is found that the binary lens is composed of two M dwarf stars with similar masses, M 1 = 0.38 ± 0.04 M (0.50 ± 0.05 M ) and M 2 = 0.38 ± 0.04 M (0.55 ± 0.06 M ), and the distance to the lens is D L = 2.77 ± 0.23 kpc (3.30 ± 0.29 kpc). Here the physical parameters outside and inside the parentheses are for the u 0 < 0 and u 0 > 0 solutions, respectively.
Free Keywords:binaries: general; gravitational lensing: micro
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X %R 10.3847/1538-4357/834/1/82
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