From Space.com http://www.space.com/scienceastronomy/alien-planets-orbit-binary-star-system-101026.html
Rendering of NN Serpentis system: image Wikipedia Tyrogthekreeper
Two massive Jupiter-like planets were recently discovered orbiting around two extremely close sister stars – an unexpected find, given the disturbing gravitational effects within most binary star systems that usually disrupt planets from forming.
The alien planets were found to orbit around the binary star system NN Serpentis, which is located about 1,670 light-years from Earth.
The more massive of the two stars is a very small white dwarf – the burnt-out remnant that is left over when a sun-like star dies. The star is 2.3 times the diameter of Earth, but has a temperature of more than 89,500 degrees Fahrenheit (49,700 degrees Celsius) – almost nine times hotter than the surface of the sun. The other star in the pair is a larger but cooler star, with a mass only one-tenth that of the sun. The two stars are joined in a very tight mutual orbit.
The astronomers caught a lucky break in observing this binary star system because it happens to lie in the same plane as Earth, creating an eclipse every 3 hours and 7 minutes when the larger star moves in front of the smaller one.
The resulting change in the brightness of the system acts like a highly precise clock. By monitoring the eclipses, the team of astronomers was able to detect small changes in the timing caused by the gravitational pull of two planets orbiting the stellar pair and tugging them out of whack, altering the eclipse schedule.
The larger planet in the system is about 5.9 times more massive than Jupiter. It orbits the binary stars every 15.5 Earth years at a staggering distance of roughly 558 million miles. Closer in, the second planet orbits every the binary pair every 7.75 Earth years, and is about 1.6 times more massive than Jupiter.
In a separate discovery, a Jupiter-sized alien planet was recently found orbiting the star HR 7162, which is a binary star system located 49 light-years away, in the constellation Lyra. These recent findings are forcing astronomers to rethink their theories about how gas giant planets form.
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