Multidimensional simulations for early-phase spectra of aspherical hypernovae: SN 1998bw and off-axis hypernovae

Masaomi Tanaka, Keiichi Maeda, Paolo A. Mazzali, Ken'ichi Nomoto

研究成果: Article査読

35 被引用数 (Scopus)

抄録

Early-phase optical spectra of aspherical jet-like supernovae (SNe) are presented. We focus on energetic core-collapse SNe, or hypernovae. Based on hydrodynamic and nucleosynthetic models, radiative transfer in the SN atmosphere is solved with a multidimensional Monte Carlo radiative transfer code, SAMURAI. Since the luminosity is boosted in the jet direction, the temperature there is higher than in the equatorial plane by ∼2000 K. This causes anisotropic ionization in the ejecta. Emergent spectra are different depending on viewing angle, reflecting both aspherical abundance distribution and anisotropic ionization. Spectra computed with an aspherical explosion model with kinetic energy 20 × 1051 ergs are compatible with those of the Type Ic SN 1998bw if ∼10%-20% of the synthesized metals are mixed out to higher velocities. The simulations enable us to predict the properties of off-axis hypernovae. Even if an aspherical hypernova explosion is observed from the side, it should show hypernova-like spectra but with some differences in the line velocity, the width of the Fe absorptions, and the strength of the Na i line.

本文言語English
ページ(範囲)L19-L22
ジャーナルAstrophysical Journal
668
1 PART 2
DOI
出版ステータスPublished - 2007 1 1
外部発表はい

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

フィンガープリント 「Multidimensional simulations for early-phase spectra of aspherical hypernovae: SN 1998bw and off-axis hypernovae」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル