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

Zhu, Wei and Udalski, A. and Gould, A. and Dominik, M. and Bozza, V. and Han, C. and Yee, J. C. and Calchi Novati, S. and Beichman, C. A. and Carey, S. and Poleski, R. and Skowron, J. and Kozłowski, S. and Mróz, P. and Pietrukowicz, P. and Pietrzyński, G. and Szymański, M. K. and Soszyński, I. and Ulaczyk, K. and Wyrzykowski, Ł. (2015) Spitzer as a Microlens Parallax Satellite: Mass and Distance Measurements of the Binary Lens System OGLE-2014-BLG-1050L. Astrophysical Journal, 805 (1). Art. No. 8. ISSN 0004-637X.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Zhu, Wei0000-0003-4027-4711
Udalski, A.0000-0001-5207-5619
Dominik, M.0000-0002-3202-0343
Bozza, V.0000-0003-4590-0136
Yee, J. C.0000-0001-9481-7123
Calchi Novati, S.0000-0002-7669-1069
Beichman, C. A.0000-0002-5627-5471
Carey, S.0000-0002-0221-6871
Poleski, R.0000-0002-9245-6368
Skowron, J.0000-0002-2335-1730
Mróz, P.0000-0001-7016-1692
Pietrukowicz, P.0000-0002-2339-5899
Ulaczyk, K.0000-0001-6364-408X
Additional Information:© 2015 American Astronomical Society. Received 2015 January 20; accepted 2015 March 12; published 2015 May 13. Work by W.Z., A.G., and B.S.G. was supported by NSF grant AST 1103471. Work by J.C.Y., A.G., and S.C. was supported by JPL grant 1500811. A.G., B.S.G., and R.W.P. were supported by NASA grant NNX12AB99G. Work by C.H. was supported by the Creative Research Initiative Program (2009-0081561) of the National Research Foundation of Korea. Work by J.C.Y. was performed under contract with the California Institute of Technology (Caltech)/Jet Propulsion Laboratory (JPL) funded by NASA through the Sagan Fellowship Program executed by the NASA Exoplanet Science Institute. Work by C.A.B. was carried out in part at the Jet Propulsion Laboratory (JPL), California Institute of Technology, under a contract with the National Aeronautics and Space Administration. The OGLE project has received funding from the European Research Council under the European Community’s Seventh Framework Programme (FP7/2007–2013)/ERC grant agreement no. 246678 to AU. This work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
National Research Foundation of Korea2009-0081561
European Research Council (ERC)246678
Subject Keywords:binaries: general; gravitational lensing: micro
Issue or Number:1
Record Number:CaltechAUTHORS:20150619-082837114
Persistent URL:
Official Citation:Spitzer as a Microlens Parallax Satellite: Mass and Distance Measurements of the Binary Lens System OGLE-2014-BLG-1050L Wei Zhu (祝伟) et al. 2015 ApJ 805 8
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58360
Deposited By: Ruth Sustaita
Deposited On:19 Jun 2015 16:32
Last Modified:09 Mar 2020 13:19

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