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Spitzer as Microlens Parallax Satellite

Mass Measurement for the OGLE-2014-BLG-0124L Planet and its Host Star

A. Udalski, J.C. Yee, A. Gould, S. Carey, W. Zhu, J. Skowron, S. Kozłowski, R. Poleski, P. Pietrukowicz, G. Pietrzyński, M.K. Szymański, P. Mróz, I. Soszyński, K. Ulaczyk, Ł. Wyrzykowski, C. Han, S. Calchi Novati, R.W. Pogge, 2015,

ApJ, 799, 237; arXiv:1410.4219 version

We combine Spitzer and ground-based observations to measure the microlens parallax vector πE, and so 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 m≈0.5 MJup and M≈0.7 MSun and are separated by a⊥≈3.1 AU in projection. The main source of uncertainty in all these numbers (approximately 30%, 30%, and 20%) is the relatively poor measurement of the Einstein radius θE, rather than uncertainty in πE, 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 πE measurement but also the first independent test of a ground-based πE measurement.


<em>Spitzer</em> and OGLE Light Curve of the Microlensing Event OGLE-2014-BLG-0124

Spitzer and OGLE Light Curve of the Microlensing Event OGLE-2014-BLG-0124

PLEASE cite the following paper when using the data or referring to these OGLE results:
Udalski et al., 2015, ApJ, 799, 237.

Any comments about the data and the form of their presentation are welcome as they can improve the future releases of OGLE analysis. Send your messages to this address.

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