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We present results of high-cadence monitoring of the optical light curve ofthe nearby, Type Ia SN 2014J in M82 using the 2.3m Aristarchos telescope. $B$and $V$-band photometry on days 15-18 after $t_{max}(B)$, obtained with acadence of 2 min per band, reveals evidence for rapid variability at the0.02-0.05 mag level on timescales of 15-60 min on all four nights, taking thered noise estimation at face value. The decline slope was measured to besteeper in the $B$-band than in $V$-band, and to steadily decrease in bothbands from 0.15 mag/day (night 1) to 0.04 mag/day (night 4) in V and from 0.19mag/day (night 1) to 0.06 mag/day (night 4) in B, corresponding to the onset ofthe secondary maximum. We propose that rapid variability could be due to one ora combination of the following scenarios: the clumpiness of the ejecta, theirinteraction with circumstellar material, the asymmetry of the explosion, or themechanism causing the secondary maximum in the near-infrared light curve. Weencourage the community to undertake high-cadence monitoring of future, nearbyand bright supernovae to investigate the intraday behavior of their lightcurves.

Evidence for Rapid Variability in the Optical Light Curve of the Type Ia SN 2014J