TY - GEN
T1 - Optical emission from aspherical core-collapse supernovae
AU - Tanaka, Masaomi
AU - Maeda, Keiichi
AU - Nomoto, Ken'ichi
AU - Mazzali, Paolo A.
AU - Tominaga, Nozomu
AU - Kawabata, Koji S.
AU - Hattori, Takashi
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2009
Y1 - 2009
N2 - Optical emission from supernovae (SNe) reflects physical properties of SNe, such as mass and kinetic energy of the ejecta and the ejected 56Ni mass, which are closely related to the central remnants, explosion scenarios and progenitor stars of SNe. Modelling of the optical emission has been done mostly under the assumption of spherical symmetry. In this paper, we present multidimensional modelling of optical emission using a multi-dimensional Monte-Carlo radiative fransfer code, SAMURAI (SupemovA MUlti-dimensional RAdlative fransfer code). We show that all the optical observations of SN 1998bw/GRB 980425, including the light curve and optical specfra at early and late phases, are consistent with polar-viewed radiation of the aspherical explosion model. The kinetic energy, which has been estimated to be 30 - 50 × 10 51 ergs by spherical models, can be reduced to 20 × 10 51 ergs. Such reduction of the kinetic energy is less effective for offaxis or less aspherical cases. As an observational test of SN asphericity, we also show our recent specfropolarimetric observations of Type Ic SN 2007gr with Subaru telescope. The data clearly indicate the difference in the distribution of the newly synthesized elements and the elements in the pre-explosion star
AB - Optical emission from supernovae (SNe) reflects physical properties of SNe, such as mass and kinetic energy of the ejecta and the ejected 56Ni mass, which are closely related to the central remnants, explosion scenarios and progenitor stars of SNe. Modelling of the optical emission has been done mostly under the assumption of spherical symmetry. In this paper, we present multidimensional modelling of optical emission using a multi-dimensional Monte-Carlo radiative fransfer code, SAMURAI (SupemovA MUlti-dimensional RAdlative fransfer code). We show that all the optical observations of SN 1998bw/GRB 980425, including the light curve and optical specfra at early and late phases, are consistent with polar-viewed radiation of the aspherical explosion model. The kinetic energy, which has been estimated to be 30 - 50 × 10 51 ergs by spherical models, can be reduced to 20 × 10 51 ergs. Such reduction of the kinetic energy is less effective for offaxis or less aspherical cases. As an observational test of SN asphericity, we also show our recent specfropolarimetric observations of Type Ic SN 2007gr with Subaru telescope. The data clearly indicate the difference in the distribution of the newly synthesized elements and the elements in the pre-explosion star
KW - Gamma-ray bursts
KW - Nucleosynthesis
KW - Polarization
KW - Radiative fransfer
KW - Supernovae
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U2 - 10.1063/1.3141585
DO - 10.1063/1.3141585
M3 - Conference contribution
AN - SCOPUS:67650631376
SN - 9780735406483
T3 - AIP Conference Proceedings
SP - 413
EP - 420
BT - Probing Stellar Populations Out To The Distant Universe - Cefalu 2008 - Proceedings of the International Conference
T2 - International Conference on Probing Stellar Populations Out To The Distant Universe, Cefalu 2008
Y2 - 7 September 2008 through 19 September 2008
ER -