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We present the photometric and spectroscopic evolution of SN 2022oqm, anearby multi-peaked hydrogen- and helium-weak calcium-rich transient (CaRT). SN2022oqm was detected 19.9 kpc from its host galaxy, the face-on spiral galaxyNGC 5875. Extensive spectroscopic coverage reveals a hot (T >= 40,000 K)continuum and carbon features observed ~1 day after discovery, SN Ic-likephotospheric-phase spectra, and strong forbidden calcium emission starting 38days after discovery. SN 2022oqm has a relatively high peak luminosity (MB =-17 mag) for CaRTs, making it an outlier in the population. We determine thatthree power sources are necessary to explain SN 2022oqm's light curve, witheach power source corresponding to a distinct peak in its light curve. Thefirst peak of the light curve is powered by an expanding blackbody with a powerlaw luminosity, consistent with shock cooling by circumstellar material.Subsequent peaks are powered by a double radioactive decay model, consistentwith two separate sources of photons diffusing through an optically thickejecta. From the optical light curve, we derive an ejecta mass and 56Ni mass of~0.89 solar masses and ~0.09 solar masses, respectively. Detailed spectroscopicmodeling reveals ejecta that is dominated by intermediate-mass elements, withsigns that Fe-peak elements have been well-mixed. We discuss several physicalorigins for SN 2022oqm and favor a white dwarf progenitor model. The inferredejecta mass points to a surprisingly massive white dwarf, challenging models ofCaRT progenitors.

SN 2022oqm: A Multi-peaked Calcium-rich Transient from a White Dwarf Binary Progenitor System