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We analyze JWST NIRSpec$+$MIRI/MRS observations of the infrared (IR)gas-phase molecular bands of the most enshrouded source (D1) within theinteracting system and luminous IR galaxy II Zw 096. We report the detection ofrovibrational lines of H$_2$O $\nu_2$=1-0 ($\sim$5.3-7.2 $\mu$m) and $^{12}$CO$\nu$=1-0 ($\sim$4.45-4.95 $\mu$m) in D1. The CO band shows the R- andP-branches in emission and the spectrum of the H$_2$O band shows the P-branchin emission and the R-branch in absorption. The H$_2$O R-branch in absorptionunveils an IR-bright embedded compact source in D1 and the CO broad componentfeatures a highly turbulent environment. From both bands, we also identifiedextended intense star-forming (SF) activity associated with circumnuclearphotodissociation regions (PDRs), consistent with the strong emission of theionised 7.7 $\mu$m polycyclic aromatic hydrocarbon band in this source. Byincluding the 4.5-7.0 $\mu$m continuum information derived from the H$_2$O andCO analysis, we modelled the IR emission of D1 with a dusty torus and SFcomponent. The torus is very compact (diameter of $\sim$3 pc at 5 $\mu$m) andcharacterised by warm dust ($\sim$ 370 K), giving an IR surface brightness of$\sim$3.6$\times$10$^{8}$ L$_{\rm sun}$/pc$^2$. This result suggests thepresence of a dust-obscured active galactic nucleus (AGN) in D1, which has anexceptionally high covering factor that prevents the direct detection of AGNemission. Our results open a new way to investigate the physical conditions ofinner dusty tori via modelling the observed IR molecular bands.

Structures Of Dust and gAs (SODA): Constraining the innermost dust properties of II Zw96 with JWST observations of H$_2$O and CO