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

Udalski, A. and Yee, J. C. and Gould, A. and Carey, S. and Zhu, W. and Skowron, J. and Kozłowski, S. and Poleski, R. and Pietrukowicz, P. and Pietrzyński, G. and Szymański, M. K. and Mróz, P. and Soszyński, I. and Ulaczyk, K. and Wyrzykowski, Ł. and Han, C. and Calchi Novati, S. and Pogge, R. W. (2015) Spitzer as a Microlens Parallax Satellite: Mass Measurement for the OGLE-2014-BLG-0124L Planet and its Host Star. Astrophysical Journal, 799 (2). Art. No. 237. ISSN 0004-637X.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Udalski, A.0000-0001-5207-5619
Yee, J. C.0000-0001-9481-7123
Carey, S.0000-0002-0221-6871
Skowron, J.0000-0002-2335-1730
Poleski, R.0000-0002-9245-6368
Pietrukowicz, P.0000-0002-2339-5899
Mróz, P.0000-0001-7016-1692
Ulaczyk, K.0000-0001-6364-408X
Calchi Novati, S.0000-0002-7669-1069
Pogge, R. W.0000-0003-1435-3053
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.
Funding AgencyGrant Number
European Research Council (ERC)246678
National Research Foundation of Korea2009-0081561
Subject Keywords:gravitational lensing: micro; planetary systems
Issue or Number:2
Record Number:CaltechAUTHORS:20150309-083325747
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Official Citation:Spitzer as a Microlens Parallax Satellite: Mass Measurement for the OGLE-2014-BLG-0124L Planet and its Host Star A. Udalski et al. 2015 ApJ 799 237
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55622
Deposited By: Ruth Sustaita
Deposited On:09 Mar 2015 16:05
Last Modified:15 Sep 2020 22:14

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