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A massive millisecond magnetar may survive a merger of a neutron star (NS)binary, which would continuously power the merger ejecta. We develop a genericdynamic model for the merger ejecta with energy injection from the centralmagnetar. The ejecta emission (the "merger-nova") powered by the magnetar peaksin the UV band and the peak of lightcurve progressively shifts to an earlierepoch with increasing frequency. A magnetar-powered mergernova could have anoptical peak brightness comparable to a supernova, which is a few tens orhundreds times brighter than the radioactive-powered merger-novae (theso-called macro-nova or kilo-nova). On the other hand, such a merger-nova wouldpeak earlier and have a significantly shorter duration than that of asupernova. An early collapse of the magnetar could suppress the brightness ofthe optical emission and shorten its duration. Suchmillisecond-magnetar-powered merger-novae may be detected from NS-NS mergerevents without an observed short gamma-ray burst, and could be a brightelectromagnetic counterpart for gravitational wave bursts due to NS-NS mergers.If detected, it suggests that the merger leaves behind a massive NS, which hasimportant implications for the equation-of-state of nuclear matter.

Bright "merger-nova" from the remnant of a neutron star binary merger: A signature of a newly born, massive, millisecond magnetar