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WD 1856 actually has a larger mass than WD 1856 b: the NASA overview page gives 0.518 solar masses (543 Jupiter masses) for the white dwarf, while the planet has less than 13.8 Jupiter masses. The white dwarf has a smaller radius than the planet as it is much denser.


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WD 1856b is not more massive than the star it orbits. The radius of WD 1856b is much larger than its star because its star is a white dwarf; but WD 1856b is much less massive. That gives the star a diameter of a bit larger than Earth while the planet's size is about that of Jupiter. The star, WD 1856+534 is about 1/2 the mass of our Sun or about 500 Jupiter ...


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