Spitzer as a microlens parallax satellite: mass and distance measurements of the binary lens system OGLE-2014-BLG-1050L

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

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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 MΘ) binary at ~1.1 kpc or a higher-mass (0.9 and 0.35 MΘ) 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.

Original languageEnglish
JournalAstrophysical Journal
Volume805
Issue number1
Early online date13 May 2015
DOIs
Publication statusPublished - 20 May 2015

Keywords

  • Binaries: general
  • Gravitational lensing: micro

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