"This is of interest because Jupiter's gravitational pull was likely a huge influence on our solar system's architecture during its formative period. So the scarcity of Jupiter-like planets could explain why our home system is different from all the others found to date."
The stars are about 360 Earth-sun distances (or astronomical units) from each other, which is very close for a binary star system with planets. The next-closest star set is about 1,000 AU apart.
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There are other mysteries as well: Why the star system has so much hydrogen and helium, instead of elements such as iron and oxygen (which is common in stars that host planets.) And why the stars are not identical twins, but have different compositions -- which could show that one star gobbled baby planets early in its childhood.
A study based on the research will be published in The Astronomical Journal.