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Despite the hypothesized similar face-on viewing angles, the infraredemission of type-1 AGNs has diverse spectral energy distribution (SED) shapesthat deviate substantially from the well-characterized quasar templates.Motivated by the commonly-seen UV-optical obscuration and the discovery ofparsec-scale mid-IR polar dust emission in some nearby AGNs, we developsemi-empirical SED libraries for reddened type-1 AGNs built on the quasarintrinsic templates, assuming low-level extinction caused by an extendeddistribution of large dust grains. We demonstrate that this model can reproducethe nuclear UV-to-IR SED and the strong mid-IR polar dust emission of NGC 3783,the type-1 AGN with the most relevant and robust observational constraints. Inaddition, we compile 64 low-$z$ Seyfert-1 nuclei with negligible mid-IR starformation contamination and satisfactorily fit the individual IR SEDs as wellas the composite UV to mid-IR composite SEDs. Given the success of these fits,we characterize the possible infrared SED of AGN polar dust emission andutilize a simple but effective strategy to infer its prevalence among type-1AGNs. The SEDs of high-$z$ peculiar AGNs, including the extremely red quasars,mid-IR warm-excess AGNs, and hot dust-obscured galaxies, can be also reproducedby our model. These results indicate that the IR SEDs of most AGNs, regardlessof redshift or luminosity, arise from similar circumnuclear torus propertiesbut differ mainly due to the optical depths of extended obscuring dustcomponents.

Polar Dust, Nuclear Obscuration and IR SED Diversity in Type-1 AGNs