Ned-allsky

Spitzer as a Microlens Parallax Satellite: Mass and Distance Measurements of the Binary Lens System OGLE-2014-BLG-1050L

May 2015 • 2015ApJ...805....8Z

Authors • Zhu, Wei • Udalski, A. • Gould, A. • Dominik, M. • Bozza, V. • Han, C. • Yee, J. C. • Calchi Novati, S. • Beichman, C. A. • Carey, S. • Poleski, R. • Skowron, J. • Kozłowski, S. • Mróz, P. • Pietrukowicz, P. • Pietrzyński, G. • Szymański, M. K. • Soszyński, I. • Ulaczyk, K. • Wyrzykowski, Ł. • OGLE Collaboration • Gaudi, B. S. • Pogge, R. W. • DePoy, D. L. • Jung, Y. K. • Choi, J. -Y. • Hwang, K. -H. • Shin, I. -G. • Park, H. • Jeong, J. • μFUN Collaboration

Abstract • We report the first mass and distance measurements of a caustic-crossing binary system OGLE-2014-BLG-1050 L using the space-based microlens parallax method. Spitzer captured the second caustic crossing of the event, which occurred ∼10 days before that seen from Earth. Due to the coincidence that the source-lens relative motion was almost parallel to the direction of the binary-lens axis, the fourfold degeneracy, which was known before only to occur in single-lens events, persists in this case, leading to either a lower-mass (0.2 and 0.07 {{M}}) binary at ∼1.1 kpc or a higher-mass (0.9 and 0.35 {{M}}) binary at ∼3.5 kpc. However, the latter solution is strongly preferred for reasons including blending and lensing probability. OGLE-2014-BLG-1050 L demonstrates the power of microlens parallax in probing stellar and substellar binaries.

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Sebastiano Calchi Novati

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Sean Carey

Senior Scientist