A Giant Planet beyond the Snow Line in Microlensing Event OGLE-2011-BLG-0251
N. Kains, R. Street, J.-Y. Choi, C. Han, A. Udalski, L. A. Almeida, F., Jablonski, P. Tristram, U. G. Jorgensen, M. K. Szymanski, M. Kubiak, G., Pietrzynski, I. Soszynski, R. Poleski, S. Kozlowski, P. Pietrukowicz, K., Ulaczyk, L. Wyrzykowski, J. Skowron, K.A. Alsubai, V. Bozza

TL;DR
This paper reports the discovery and analysis of a giant planet beyond the snow line orbiting an M dwarf, using gravitational microlensing data to measure its properties and location in the galaxy.
Contribution
First unambiguous measurement of a giant planet beyond the snow line via microlensing, including mass, distance, and orbital parameters.
Findings
Planet mass: 0.53 ± 0.21 M_Jup
Host star mass: 0.26 ± 0.11 M_Sun
Located at 2.57 ± 0.61 kpc from Earth
Abstract
We present the analysis of the gravitational microlensing event OGLE-2011-BLG-0251. This anomalous event was observed by several survey and follow-up collaborations conducting microlensing observations towards the Galactic Bulge. Based on detailed modelling of the observed light curve, we find that the lens is composed of two masses with a mass ratio q=1.9 x 10^-3. Thanks to our detection of higher-order effects on the light curve due to the Earth's orbital motion and the finite size of source, we are able to measure the mass and distance to the lens unambiguously. We find that the lens is made up of a planet of mass 0.53 +- 0.21,M_Jup orbiting an M dwarf host star with a mass of 0.26 +- 0.11 M_Sun. The planetary system is located at a distance of 2.57 +- 0.61 kpc towards the Galactic Centre. The projected separation of the planet from its host star is d=1.408 +- 0.019, in units of the…
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