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We present multi-wavelength photometry and spectroscopy of SN 2022jli, anunprecedented Type Ic supernova discovered in the galaxy NGC 157 at a distanceof $\approx$ 23 Mpc. The multi-band light curves reveal many remarkablecharacteristics. Peaking at a magnitude of $g=15.11\pm0.02$, the high-cadencephotometry reveals 12.5$\pm0.2\ $day periodic undulations superimposed on the200 day supernova decline. This periodicity is observed in the light curvesfrom nine separate filter and instrument configurations with peak-to-peakamplitudes of $\simeq$ 0.1 mag. This is the first time that repeated periodicoscillations, over many cycles, have been detected in a supernova light curve.SN 2022jli also displays an extreme early excess which fades over $\approx$ 25days followed by a rise to a peak luminosity of $L_{\rm opt} = 10^{42.1}$ ergs$^{-1}$. Although the exact explosion epoch is not constrained by data, thetime from explosion to maximum light is $\gtrsim$ 59 days. The luminosity canbe explained by a large ejecta mass ($M_{\rm ej}\approx12\pm6$M$_{\odot}$)powered by $^{56}$Ni but we find difficulty in quantitatively modelling theearly excess with circumstellar interaction and cooling. Collision between thesupernova ejecta and a binary companion is a possible source of this emission.We discuss the origin of the periodic variability in the light curve, includinginteraction of the SN ejecta with nested shells of circumstellar matter andneutron stars colliding with binary companions.

SN 2022jli: a type Ic supernova with periodic modulation of its light curve and an unusually long rise