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.
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.
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