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.

Links

• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2015ApJ...805....8Z
• PDF https://iopscience.iop.org/article/10.1088/0004-637X/805/1/8/pdf
• PDF https://stacks.iop.org/0004-637X/805/8/pdf
• PREPRINT http://arxiv.org/abs/1501.04107
• DATA https://irsa.ipac.caltech.edu/bibdata/2015/Z/2015ApJ...805....8Z.html
• ELECTR https://doi.org/10.1088%2F0004-637X%2F805%2F1%2F8