J2102-4145 shows one 0.375-solar-mass white dwarf retaining a thick hydrogen envelope via stable mass transfer and a 0.314-solar-mass companion with an extremely thin envelope below 10^{-7} solar masses after common-envelope ejection, challenging standard bifurcation criteria.
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Extreme mass loss during common envelope evolution: the origin of the double low-mass white dwarf system J2102--4145
J2102-4145 shows one 0.375-solar-mass white dwarf retaining a thick hydrogen envelope via stable mass transfer and a 0.314-solar-mass companion with an extremely thin envelope below 10^{-7} solar masses after common-envelope ejection, challenging standard bifurcation criteria.