A theoretical color-velocity correlation for supernovae associated with gamma-ray bursts

Sharon Rapoport, Stuart A. Sim, Keiichi Maeda, Masaomi Tanaka, Markus Kromer, Brian P. Schmidt, Ken'Ichi Nomoto

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We carry out the first multi-dimensional radiative transfer calculations to simultaneously compute synthetic spectra and light curves for models of supernovae driven by fast bipolar outflows. These allow us to make self-consistent predictions for the orientation dependence of both color evolution and spectral features. We compare models with different degrees of asphericity and metallicity and find significant observable consequences of both. In aspherical models, we find spectral and light curve features that vary systematically with observer orientation. In particular, we find that the early-phase light curves are brighter and bluer when viewed close to the polar axis but that the peak flux is highest for equatorial (off-axis) inclinations. Spectral line features also depend systematically on observer orientation, including the velocity of the Si II 6355 Å line. Consequently, our models predict a correlation between line velocity and color that could assist the identification of supernovae associated with off-axis jet-driven explosions. The amplitude and range of this correlation depends on the degree of asphericity, the metallicity, and the epoch of observation but we find that it is always present and acts in the same direction.

Original languageEnglish
Article number38
JournalAstrophysical Journal
Volume759
Issue number1
DOIs
Publication statusPublished - 2012 Nov 1
Externally publishedYes

Keywords

  • gamma-ray burst: general
  • radiative transfer
  • supernovae: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'A theoretical color-velocity correlation for supernovae associated with gamma-ray bursts'. Together they form a unique fingerprint.

  • Cite this