Aspherical ejecta of type Ia supernovae inferred from high velocity features

M. Tanaka, P. A. Mazzali, K. Maeda, K. Nomoto

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

Abstract

Spectral synthesis in 3-dimensional space for the early phase spectra of Type Ia supernovae is presented. In particular, the high velocity absorption features that ubiquitously exist at the earliest epochs (∼ 10 days before maximum light) are investigated. The increasing number of early spectra available allows statistical study on the geometry of the ejecta. The observed diversity in the strength of the high velocity features (HVFs) can be reproduced through a "covering factor", which represents the fraction of the projected photosphere that is concealed by high velocity material. Various geometrical models involving high velocity material with a clumpy structure or a thick torus can naturally account for the observed statistics of HVFs. Models with 1 or 2 blobs, as well as a thin torus or disk-like enhancement seem to be unlikely as a standard situation.

Original languageEnglish
Title of host publicationORIGIN OF MATTER AND EVOLUTION OF GALAXIES
Subtitle of host publicationInternational Symposium on Origin of Matter and Evolution of Galaxies 2005: New Horizon of Nuclear Astrophysics and Cosmology
Pages485-487
Number of pages3
DOIs
Publication statusPublished - 2006 Dec 1
Externally publishedYes
EventORIGIN OF MATTER AND EVOLUTION OF GALAXIES: International Symposium on Origin of Matter and Evolution of Galaxies 2005: New Horizon of Nuclear Astrophysics and Cosmology - Tokyo, Japan
Duration: 2005 Nov 82005 Nov 11

Publication series

NameAIP Conference Proceedings
Volume847
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherORIGIN OF MATTER AND EVOLUTION OF GALAXIES: International Symposium on Origin of Matter and Evolution of Galaxies 2005: New Horizon of Nuclear Astrophysics and Cosmology
CountryJapan
CityTokyo
Period05/11/805/11/11

Keywords

  • Line: profiles
  • Radiative transfer
  • Supernovae: general

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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