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A previously unremarkable star near the Canis Major OB1/R1 associationunderwent an episode of multiple deep brightness minima. Light curves based onarchival Gaia, ZTF, NEOWISE data and additional observations from LCO and UKIRTshow that the star was not variable prior to 2019 Aug 18 (MJD 58700), and onthat date started showing brightness dips of up to 3 magnitudes in the Gaia Gand ZTF r bandpasses. After MJD 59500, ~800 days after the onset of thesedipping events, the star returned to its previous brightness, and nosignificant dipping events have been recorded since. Compared to the stablephase, NEOWISE infrared photometry in the W1 and W2 bands indicates a generallyredder color, and both decreases and increases in brightness at different timesduring the dipping episode. The spectrum of Gaia21bcv taken after the end ofthe dipping episode shows several neutral and ionized metal absorption lines,including Li, indicating a spectral type of ~ K5. Variable emission from [OI]was observed. The H alpha absorption in Gaia21bcv is too faint and irregularfor this spectral type, indicating that the line is partly filled in byvariable emission, a signature of weak episodic accretion. Gaia21bcv lies abovethe zero-age main sequence, but is much fainter than typical R CrB stars. Weinterpret the light curve of Gaia21bcv as being similar to the occultationevents in Epsilon Aurigae, i.e., occultation by a disk around a companionobject orbiting the primary star.

An Episode of Occultation Events in Gaia21bcv