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We report the analysis of time-series of infrared $JHK_s$ photometry of thedwarf nova V2051 Oph in quiescence with eclipse mapping techniques toinvestigate structures and the spectrum of its accretion disc. The light curvesafter removal of the ellipsoidal variations caused by the mass-donor star showa double-wave modulation signalling the presence of two asymmetric lightsources in the accretion disc. Eclipse maps reveal two spiral arms on top ofthe disc emission, one at $R_1= 0.28\pm 0.02 \,R_\mathrm{L1}$ and the other at$R_2= 0.42\pm 0.02 \,R_\mathrm{L1}$ (where $R_\mathrm{L1}$ is the distance fromdisc centre to the inner Lagrangian point), which are seen face-on at binaryphases consistent with the maxima of the double-wave modulation. The wide openangle inferred for the spiral arms ($\theta_s= 21^o \pm 4^o$) suggests thequiescent accretion disc of V2051 Oph has high viscosity. The accretion disc ishot and optically thin in its inner regions ($T_\mathrm{gas}\sim 10-12 \times10^3\,K$ and surface densities $\sim 10^{-3}-10^{-2}\,g\,cm^{-2}$), and becomescool and opaque in its outer regions.

Infrared photometry of the dwarf nova V2051 Ophiuchi: II -- The quiescent accretion disc and its spiral arms