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Strangeon stars, which are proposed to describe the nature of pulsar-likecompact stars, have passed various observational tests. The maximum mass of anon-rotating strangeon star could be high, which implies that the remnants ofbinary strangeon star mergers could even be long-lived massive strangeon stars.We study rigidly rotating strangeon stars in the slowly rotating approximation,using the Lennard-Jones model for the equation of state. Rotation cansignificantly increase the maximum mass of strangeon stars with unchangedbaryon numbers, enlarging the mass-range of long-lived strangeon stars. Duringspin-down after merger, the decrease of radius of the remnant will lead to therelease of gravitational energy. Taking into account the efficiency ofconverting the gravitational energy luminosity to the observed X-rayluminosity, we find that the gravitational energy could provide an alternativeenergy source for the plateau emission of X-ray afterglow. The fitting resultsof X-ray plateau emission of some short gamma-ray bursts suggest that themagnetic dipole field strength of the remnants can be much smaller than that ofexpected when the plateau emission is powered only by spin-down luminosity ofmagnetars.

Rotating massive strangeon stars and X-ray plateau of short GRBs