Differential photometry of LP 89-187 obtained using HiPERCAM, with g_s (colour-coded green), r_s (yellow), i_s (orange), and z_s (red) shown from the bottom to top. The differential flux for each 0.74 s exposure is normalised by dividing by the mean in each band, and each subsequent filter has been shifted vertically by 0.5. Time zero corresponds to MJD=60 350.902. The residual features, including the flare-like features in the g_s band, are due to poorer conditions. The signature of the star’s rotation has largely been removed due to the large colour difference between the target and the two comparison stars.