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PSR\,J1723$-$2837 is a "redback" millisecond pulsar (MSP) with a low-masscompanion in a 14.8\,h orbit. The system's properties closely resemble those of"transitional" MSPs that alternate between spin-down and accretion-poweredstates. In this paper we report on long-term photometry of the 15.5\,magcompanion to the pulsar. We use our data to illustrate that the starexperiences sporadic activity, which we attribute to starspots. We also findthat the companion is not tidally locked and infer $P_{\rm s}/P_{\rm b}=0.9974(7)$ for the ratio between the rotational and orbital periods. Finally,we place constraints on various parameters, including the irradiationefficiency and pulsar mass. We discuss similarities with other redback MSPs andconclude that starspots may provide the most likely explanation for the oftenseen irregular and asymmetric optical lightcurves.

An active, asynchronous companion to a redback millisecond pulsar