(binary star system with exoplanets)
HD 133131 is binary star consisting
of two Sun-like G-type stars
(though older and with lower metallicity),
both of which have extra-solar planets,
one star with a gas giant, and the other with two.
Gas giants have generally been found around higher metallicity stars
and theories have been developed to explain this,
so this system is atypical.
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Referenced by page:
Henry Draper Catalog (HD)