Parameters of the classical type-IIP supernova SN 1999em

Details Parameters of the classical type-IIP supernova SN 1999em Parameters of the classical type-IIP supernova SN 1999em

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005astl...31..429b&link_type=abstract

Astronomy Letters, vol. 31, Issue 7, p.429-441

Astronomy and Astrophysics

Astronomy

15

Supernovae And Supernova Remnants - Models - Radiative Transfer

Scientific paper

Based on observations of SN 1999em, we determined the physical parameters of this supernova using hydrodynamic calculations including nonequilibrium radiative transfer. Taking the distance to SN 1999em estimated by the expanding photosphere method (EPM) to be D = 7.5 Mpc, we found the parameters of the presupernova: radius R = 450R &sun;, mass M = 15M &sun;, and explosion energy E = 7 × 1050 erg. For the distance D = 12 Mpc determined from Cepheids, R, M, and E must be increased to the following values: R = 1000R &sun;, M = 18M &sun;, and E = 1051 erg. We show that one cannot restrict oneself to using the simple analytical formulas relating the supernova and presupernova parameters to obtain reliable parameters for type-IIP presupernovae.

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