Ejecta and progenitor of the low-luminosity Type IIP supernova 2003Z - AstrophysicsReport as inadecuate

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Abstract: The origin of low-luminosity Type IIP supernovae is unclear: they have beenproposed to originate either from massive about 25 Msun or low-mass about 9Msun stars. We wish to determine parameters of the low-luminosity Type IIPsupernova 2003Z, to estimate a mass-loss rate of the presupernova, and torecover a progenitor mass. We compute the hydrodynamic models of the supernovato describe the light curves and the observed expansion velocities. The winddensity of the presupernova is estimated using a thin shell model for theinteraction with circumstellar matter. We estimate an ejecta mass of 14 Msun,an explosion energy of 2.45x10^50 erg, a presupernova radius of 229 Rsun, and aradioactive Ni-56 amount of 0.0063 Msun. The upper limit of the wind densityparameter in the presupernova vicinity is 10^13 g-cm, and the mass lost at thered-yellow supergiant stage is less than 0.6 Msun assuming the constantmass-loss rate. The estimated progenitor mass is in the range of 14.4-17.4Msun. The presupernova of SN 2003Z was probably a yellow supergiant at the timeof the explosion. The progenitor mass of SN 2003Z is lower than those of SN1987A and SN 1999em, normal Type IIP supernovae, but higher than the lowerlimit of stars undergoing a core collapse. We propose an observational testbased on the circumstellar interaction to discriminate between the massiveabout 25 Msun and moderate-mass about 16 Msun scenarios.

Author: V.P. Utrobin 1 and 2, N.N. Chugai 3, A. Pastorello 4 1 MPA, Garching, 2 ITEP, Moscow, 3 Institute of Astronomy, RAS, Moscow, 4 Qu

Source: https://arxiv.org/

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