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We present the mid-infrared (MIR) light curves (LCs) of a tidal disruptionevent (TDE) candidate in the center of a nearby ultraluminous infrared galaxy(ULIRG) F01004-2237 using archival {\it WISE} and {\it NEOWISE} data from 2010to 2016. At the peak of the optical flare, F01004-2237 was IR quiescent. Aboutthree years later, its MIR fluxes have shown a steady increase, rising by 1.34and 1.04 mag in $3.4$ and $4.6\mu$m up to the end of 2016. The host-subtractedMIR peak luminosity is $2-3\times10^{44}$\,erg\,s$^{-1}$. We interpret the MIRLCs as an infrared echo, i.e. dust reprocessed emission of the optical flare.Fitting the MIR LCs using our dust model, we infer a dust torus of the size ofa few parsecs at some inclined angle. The derived dust temperatures range from$590-850$\,K, and the warm dust mass is $\sim7\,M_{\odot}$. Such a large massimplies that the dust cannot be newly formed. We also derive the UV luminosityof $4-11\times10^{44}$\,erg\,s$^{-1}$. The inferred total IR energy is$1-2\times10^{52}$\,erg, suggesting a large dust covering factor. Finally, ourdust model suggests that the long tail of the optical flare could be due todust scattering.

Discovery of a Mid-infrared Echo from the TDE candidate in the nucleus of ULIRG F01004-2237