SPITZER AS A MICROLENS PARALLAX SATELLITE: MASS MEASUREMENT FOR THE OGLE-2014-BLG-0124L PLANET AND ITS HOST STAR

We combine Spitzer and ground-based observations to measure the microlens parallax vector [pi] sub(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 sub(ju...

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Bibliographic Details
Published in:The Astrophysical journal 2015-02, Vol.799 (2), p.1-10
Main Authors: Udalski, A, Yee, J C, Gould, A, Carey, S, Zhu, W, Skowron, J, Kozlowski, S, Poleski, R, Pietrukowicz, P, Pietrzynski, G
Format: Article
Language:English
Subjects:
ACCURACY
APPROXIMATIONS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COMPARATIVE EVALUATIONS
DISTANCE
GRAVITATIONAL LENSES
MASS
Mathematical analysis
Parallax
Planetary systems
PLANETS
SATELLITES
SPACE
STARS
Uncertainty
Vectors (mathematics)
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Summary:We combine Spitzer and ground-based observations to measure the microlens parallax vector [pi] sub(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 sub(jup) and M ~ 0.7 M sub([middot in circle]) and are separated by a sub([perpendicular]) ~ 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 [straighttheta] sub(E), rather than uncertainty in [pi] sub(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 [pi] sub(E) measurement, but also the first independent test of a ground-based [pi] sub(E) measurement.
ISSN:1538-4357
0004-637X
1538-4357
DOI:10.1088/0004-637X/799/2/237