Optical emission from aspherical core-collapse supernovae

Masaomi Tanaka, Keiichi Maeda, Ken'ichi Nomoto, Paolo A. Mazzali, Nozomu Tominaga, Koji S. Kawabata, Takashi Hattori

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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

Original languageEnglish
Title of host publicationProbing Stellar Populations Out To The Distant Universe - Cefalu 2008 - Proceedings of the International Conference
Pages413-420
Number of pages8
DOIs
Publication statusPublished - 2009
EventInternational Conference on Probing Stellar Populations Out To The Distant Universe, Cefalu 2008 - Cefalu, Sicily, Italy
Duration: 2008 Sep 72008 Sep 19

Publication series

NameAIP Conference Proceedings
Volume1111
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherInternational Conference on Probing Stellar Populations Out To The Distant Universe, Cefalu 2008
CountryItaly
CityCefalu, Sicily
Period08/9/708/9/19

Keywords

  • Gamma-ray bursts
  • Nucleosynthesis
  • Polarization
  • Radiative fransfer
  • Supernovae

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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