Progenitor mass of the type IIP supernova 2005cs

¹ Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85741 Garching, Germany
² Institute of Theoretical and Experimental Physics, B. Cheremushkinskaya St. 25, 117218 Moscow, Russia e-mail: utrobin@itep.ru
³ Institute of Astronomy of Russian Academy of Sciences, Pyatnitskaya St. 48, 109017 Moscow, Russia

Received: 27 May 2008
Accepted: 29 August 2008

Abstract

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 , an explosion energy of  erg, a presupernova radius of , and a radioactive ⁵⁶Ni mass of . The derived progenitor mass of SN 2005cs is , 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 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.