First Orbital Parameters of a Planet Found by Microlensing

Astronomy and Astrophysics – Astronomy

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Scientific paper

The Jupiter/Saturn analog planetary system OGLE-2006-BLG-109Lb,c (Gaudi et al. 2008, Science, 319, 927) provides the first case of a planetary system found by microlensing in which there are constraints on the planetary orbital parameters besides the separation in the plane of the sky. The orbital motion of the "saturn" is constrained by the light curve, and we are able to measure the relative star-planet velocity with reasonably high precision. We also have a weak measure of the orbital acceleration, which constrains the separation along the line of sight. Since the light curve constrains the mass of the star through the microlensing parallax and finite source effects, the orbit is described by 6 parameters. We measure 4 of these with high precision (the separations and velocities in the plane of the sky), while the 5th parameter (the orbital acceleration) is weakly constrained. We explore the bound, stable orbits that are consistent with these measured parameters, and find the range of orbital parameters that are consistent with these measurements. We find that the orbital inclination is close to 60 degrees and the eccentricity is likely to be small.

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