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SN 2020cxd is a representative of the family of low-energy, underluminousType IIP supernovae (SNe), whose observations and analysis were recentlyreported by Yang et al. (2021). Here we re-evaluate the observational data forthe diagnostic SN properties by employing the hydrodynamic explosion model of a9 MSun red supergiant progenitor with an iron core and a pre-collapse mass of8.75 Msun. The explosion of the star was obtained by the neutrino-drivenmechanism in a fully self-consistent simulation in three dimensions (3D).Multi-band light curves and photospheric velocities for the plateau phase arecomputed with the one-dimensional radiation-hydrodynamics code STELLA, appliedto the spherically averaged 3D explosion model as well as spherisized radialprofiles in different directions of the 3D model. We find that the overallevolution of the bolometric light curve, duration of the plateau phase, andbasic properties of the multi-band emission can be well reproduced by our SNmodel with its explosion energy of only 0.7x10^50 erg and an ejecta mass of 7.4Msun. These values are considerably lower than the previously reported numbers,but they are compatible with those needed to explain the fundamentalobservational properties of the prototype low-luminosity SN 2005cs. Because ofthe good compatibility of our photospheric velocities with line velocitiesdetermined for SN 2005cs, we conclude that the line velocities of SN 2020cxdare probably overestimated by up to a factor of about 3. The evolution of theline velocities of SN 2005cs compared to photospheric velocities in differentexplosion directions might point to intrinsic asymmetries in the SN ejecta.

Low-luminosity type IIP supernovae: SN 2005cs and SN 2020cxd as very low-energy iron core-collapse explosions