OGLE-2012-BLG-0026 is a gravitational microlensing event
previously discovered by Han et al. 2013. A gravitational microlensing event
occurs when a massive foreground object crosses the line-of-sight to a
background star. The gravitational field of the foreground object can act as a
lens and magnify the brightness of the background star. In the case of
OGLE-2012-BLG-0026, the foreground object consists of a Sun-like star with two
cold gas giant planets. Since its detection, the angular separation of the foreground
star from the background star has increased sufficiently to allow light from
the foreground star to be observed separately. As a result, new observations of
the foreground star have enabled the physical parameters of the planetary
system to be constrained to within 5 percent. The two gas giant planets are
estimated to have 0.145 ± 0.008 and 0.86 ± 0.06 times the mass of Jupiter, and
projected separations of 4.0 ± 0.5 AU and 4.8 ± 0.7 AU, respectively. Both
planets are typical cold gas giant planets orbiting a Sun-like star, similar to
Jupiter and Saturn.
Reference:
Beaulieu et al. (2016), "Revisiting the microlensing
event OGLE 2012-BLG-0026: A solar mass star with two cold giant planets",
arXiv:1601.01846 [astro-ph.EP]