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The distribution of white dwarf rotation periods provides a means forconstraining angular momentum evolution during the late stages of stellarevolution, as well as insight into the physics and remnants of doubledegenerate mergers. Although the rotational distribution of low mass whitedwarfs is relatively well constrained via asteroseismology, that of high masswhite dwarfs, which can arise from either intermediate mass stellar evolutionor white dwarf mergers, is not. Photometric variability in white dwarfs due torotation of a spotted star is rapidly increasing the sample size of high masswhite dwarfs with measured rotation periods. We present the discovery of 22.4minute photometric variability in the lightcurve of EGGR 156, a stronglymagnetic, ultramassive white dwarf. We interpret this variability as rapidrotation, and our data suggest that EGGR 156 is the remnant of a doubledegenerate merger. Finally, we calculate the rate of period change in rapidlyrotating, massive, magnetic WDs due to magnetic dipole radiation. In manycases, including EGGR 156, the period change is not currently detectable overreasonable timescales, indicating that these WDs could be very precise clocks.For the most highly magnetic, rapidly rotating massive WDs, such as ZTFJ1901+1450 and RE J0317$-$853, the period change should be detectable and mayhelp constrain the structure and evolution of these exotic white dwarfs.

The Rapid Rotation of the Strongly Magnetic Ultramassive White Dwarf EGGR 156