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About 3-10\% of Type I active galactic nuclei (AGN) have double-peaked broadBalmer lines in their optical spectra originating from the motion of gas intheir accretion disk. Double-peaked profiles arise not only in AGN, butoccasionally appear during optical flares from tidal disruption events andchanging-state AGN. In this paper we identify 250 double-peaked emitters (DPEs)amongst a parent sample of optically variable broad-line AGN in the ZwickyTransient Facility (ZTF) survey, corresponding to a DPE fraction of 19\%. Wemodel spectra of the broad H$\alpha$ emission line regions and provide acatalog of the fitted accretion disk properties for the 250 DPEs. Analysis ofpower spectra derived from the 5 year ZTF light curves finds that DPE lightcurves have similar amplitudes and power law indices to other broad-line AGN.Follow-up spectroscopy of 12 DPEs reveals that $\sim$50\% display significantchanges in the relative strengths of their red and blue peaks over long $10-20$year timescales, indicating that broad-line profile changes arising from spiralarm or hotspot rotation are common amongst optically variable DPEs. Analysis ofthe accretion disk parameters derived from spectroscopic modeling providesevidence that DPEs are not in a special accretion state, but are simply normalbroad-line AGN viewed under the right conditions for the accretion disk to beeasily visible. We include inspiraling SMBH binary candidate SDSSJ1430+2303 inour analysis, and discuss how its photometric and spectroscopic variability isconsistent with the disk-emitting AGN population in ZTF.

Panic at the ISCO: time-varying double-peaked broad lines from evolving accretion disks are common amongst optically variable AGN