HYDRODYNAMICAL MODELS OF TYPE II PLATEAU SUPERNOVAE

MELINA C. BERSTEN, OMAR BENVENUTO, MARIO HAMUY

ASTROPHYSICAL JOURNAL

IOP PUBLISHING LTD

Lugar: Londres; Año: 2011 vol. 729 p. 1 - 19

0004-637X

We present bolometric light curves of Type II plateau supernovae obtained using a newly developed, one-dimensional Lagrangian hydrodynamic code with flux-limited radiation diffusion. Using our code we calculate the bolometric light curve and photospheric velocities of SN 1999em, obtaining a remarkably good agreement with observations despite the simplifications used in our calculation. The physical parameters used in our calculation areE = 1.25 foe, M = 19M, R = 800 R, and MNi = 0.056M. We find that an extensive mixing of 56Ni is needed in order to reproduce a plateau as flat as that shown by the observations. We also study the possibility to fit the observations with lower values of the initial mass consistently with upper limits that have been inferred from pre-supernovaimaging of SN 1999em in connection with stellar evolution models. We cannot find a set of physical parameters that reproduce well the observations for models with pre-supernova mass of 12M, although models with 14M cannot be fully discarded.