Progenitor mass of the type IIP supernova 2005 cs

Context. The progenitor mass of type IIP supernova can be determined from either hydrodynamic modeling of the event or pre-explosion observations. Aims. To compare these approaches, we determine parameters of the sub-luminous supernova 2005cs and estimate its progenitor mass. Methods. We compute the hydrodynamic models of the supernova to describe its light curves and expansion velocity data. Results. We estimate a presupernova mass of 17.3 ± 1 M ⊙ , an explosion energy of (4.1 ± 0.3) × 10 50 erg, a presupernova radius of 600 ± 140 R ⊙ , and a radioactive 56 Ni mass of 0.0082 ± 0.0016 M ⊙. The derived progenitor mass of SN 2005cs is 18.2 ± 1 M ⊙ , which is in-between those of low-luminosity and normal type IIP supernovae. Conclusions. The obtained progenitor mass of SN 2005cs is higher than derived from pre-explosion images. The masses of four type IIP supernovae estimated by means of hydrodynamic modeling are systematically higher than the average progenitor mass for the 9 − 25 M ⊙ mass range. This result, if confirmed for a larger sample, would imply that a serious revision of the present-day view on the progenitors of type IIP supernovae is required.