Two-faced star reveals a pulsar’s surprising bulk

An ultramassive pulsar is frying its stellar companion

illustration of a pulsar and companion star

PICK A SIDE  A pulsar (starburst illustrated in lower right) heats just one side of its companion star in this binary system called PSR J2215+5135. The duality helped astronomers weigh the pulsar, and showed it’s one of the most massive ever seen.

G. Pérez-Díaz/IAC

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