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An Ultramassive, Fast-Spinning White Dwarf in a Peculiar Binary System

Tiengo, A.; Mereghetti, S.; Stella, L. +3 more

White dwarfs typically have masses in a narrow range centered at about 0.6 solar mass (M_⊙). Only a few ultramassive white dwarfs (mass > 1.2 M_⊙) are known. Those in binary systems are of particular interest, because a small amount of accreted mass could drive them above the Chandrasekhar limit, beyond which they become gra…