Spitzer as a Microlens Parallax Satellite: Mass Measurement for the OGLE-2014-BLG-0124L Planet and its Host Star

Creators: Udalski, A.; Yee, J. C.; Gould, A.; Carey, S.; Zhu, W.; Skowron, J.; Kozłowski, S.; Poleski, R.; Pietrukowicz, P.; Pietrzyński, G.; Szymański, M. K.; Mróz, P.; Soszyński, I.; Ulaczyk, K.; Wyrzykowski, Ł.; Han, C.; Calchi Novati, S.; Pogge, R. W.

Abstract

We combine Spitzer and ground-based observations to measure the microlens parallax vector π_E, and thus the mass and distance of OGLE-2014-BLG-0124L, making it the first microlensing planetary system with a space-based parallax measurement. The planet and star have masses of m ~ 0.5 M_(jup) and M ~ 0.7 M_☉ and are separated by a_⊥ ~ 3.1 AU in projection. The main source of uncertainty in all of these numbers (approximately 30%, 30%, and 20%) is the relatively poor measurement of the Einstein radius θ_E, rather than uncertainty in π_E, which is measured with 2.5% precision. This compares to 22% based on OGLE data alone, implying that the Spitzer data provide not only a substantial improvement in the precision of the π_E measurement, but also the first independent test of a ground-based π_E measurement.

Additional Information

© 2015 American Astronomical Society. Received 2014 October 23; accepted 2014 December 9; published 2015 February 2. 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 A.U. 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. A.G. was supported by NSF grant AST 1103471 and NASA grant NNX12AB99G. Work by J.C.Y., A.G., and S.C. was supported by JPL grant 1500811. Work by C.H. was supported by the Creative Research Initiative Program (2009-0081561) of the National Research Foundation of Korea. 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.

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