OGLE-2015-BLG-0196: Ground-based Gravitational Microlens Parallax Confirmed By Space-Based Observation

C. Han; A. Udalski; A. Gould; Wei Zhu; M. K. Szymański; I. Soszyński; J. Skowron; P. Mróz; R. Poleski; P. Pietrukowicz; S. Kozłowski; K. Ulaczyk; M. Pawlak; J. C. Yee; C. Beichman; S. Calchi Novati; S. Carey; C. Bryden; M. Fausnaugh; B. S. Gaudi; Calen B. Henderson; Y. Shvartzvald; B. Wibking

doi:10.3847/1538-4357/834/1/82

paper

OGLE-2015-BLG-0196: Ground-based Gravitational Microlens Parallax Confirmed By Space-Based Observation

arXiv:1611.02765 · doi:10.3847/1538-4357/834/1/82

Abstract

In this paper, we present the 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 {\it 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 two-fold 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 $M_{1} = 0.38 \pm 0.04 M_{⊙}$ ( $0.50 \pm 0.05 M_{⊙})$ and $M_{2} = 0.38 \pm 0.04 M_{⊙}$ ( $0.55 \pm 0.06 M_{⊙}$ ) and the distance to the lens is $D_{L} = 2.77 \pm 0.23$ kpc ( $3.30 \pm 0.29$ kpc). Here the physical parameters out and in the parenthesis are for the $u_{0} < 0$ and $u_{0} > 0$ solutions, respectively.

arXiv comment7 pages, 3 tables, 6 figures

OGLE-2015-BLG-0196: Ground-based Gravitational Microlens Parallax Confirmed By Space-Based Observation

Abstract

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