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We study the properties of galaxies hosting mid-infrared outbursts in thecontext of a catalog of five hundred thousand galaxies from the Sloan DigitalSky Survey. We find that nuclear obscuration, as inferred by the surroundingdust mass, does not correlate with host galaxy type, stellar properties (e.g.total mass and mean age), or with the extinction of the host galaxy asestimated by the Balmer decrement. This implies that nuclear obscuration maynot be able to explain any over-representation of tidal disruption events inparticular host galaxies. We identify a region in the galaxy catalog parameterspace that contains all unobscured tidal disruption events but only harbors$\lesssim $ 11\% of the mid-infrared outburst hosts. We find that mid-infraredoutburst hosts appear more centrally concentrated and have higher galaxyS\'ersic indices than galaxies hosting active galactic nuclei (AGN) selectedusing the BPT classification. We thus conclude that the majority ofmid-infrared outbursts are not hidden tidal disruption events but are insteadconsistent with being obscured AGN that are highly variable, such aschanging-look AGN.

the astrophysical journal. letters

Mid-Infrared Outbursts in Nearby Galaxies: Nuclear Obscuration and  Connections to Hidden Tidal Disruption Events and Changing-Look Active  Galactic Nuclei