skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A THEORETICAL COLOR-VELOCITY CORRELATION FOR SUPERNOVAE ASSOCIATED WITH GAMMA-RAY BURSTS

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 A 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.

Authors:
; ;  [1]; ;  [2];  [3];  [4]
  1. Research School of Astronomy and Astrophysics, Australian National University, Weston Creek, ACT 2611 (Australia)
  2. Institute of Physics and Mathematics of the Universe, University of Tokyo, Tokyo (Japan)
  3. National Astronomical Observatory, Mitaka, Tokyo (Japan)
  4. Max Plank Institute for Astrophysics, Garching (Germany)
Publication Date:
OSTI Identifier:
22086481
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 759; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; ASTRONOMY; ASTROPHYSICS; COLOR; COMPARATIVE EVALUATIONS; CORRELATIONS; COSMIC GAMMA BURSTS; DIAGRAMS; EMISSION SPECTRA; INCLINATION; JETS; ORIENTATION; RADIANT HEAT TRANSFER; SILICON IONS; SUPERNOVAE; VELOCITY; VISIBLE RADIATION

Citation Formats

Rapoport, Sharon, Sim, Stuart A., Schmidt, Brian P., Maeda, Keiichi, Nomoto, Ken'ichi, Tanaka, Masaomi, and Kromer, Markus. A THEORETICAL COLOR-VELOCITY CORRELATION FOR SUPERNOVAE ASSOCIATED WITH GAMMA-RAY BURSTS. United States: N. p., 2012. Web. doi:10.1088/0004-637X/759/1/38.
Rapoport, Sharon, Sim, Stuart A., Schmidt, Brian P., Maeda, Keiichi, Nomoto, Ken'ichi, Tanaka, Masaomi, & Kromer, Markus. A THEORETICAL COLOR-VELOCITY CORRELATION FOR SUPERNOVAE ASSOCIATED WITH GAMMA-RAY BURSTS. United States. doi:10.1088/0004-637X/759/1/38.
Rapoport, Sharon, Sim, Stuart A., Schmidt, Brian P., Maeda, Keiichi, Nomoto, Ken'ichi, Tanaka, Masaomi, and Kromer, Markus. Thu . "A THEORETICAL COLOR-VELOCITY CORRELATION FOR SUPERNOVAE ASSOCIATED WITH GAMMA-RAY BURSTS". United States. doi:10.1088/0004-637X/759/1/38.
@article{osti_22086481,
title = {A THEORETICAL COLOR-VELOCITY CORRELATION FOR SUPERNOVAE ASSOCIATED WITH GAMMA-RAY BURSTS},
author = {Rapoport, Sharon and Sim, Stuart A. and Schmidt, Brian P. and Maeda, Keiichi and Nomoto, Ken'ichi and Tanaka, Masaomi and Kromer, Markus},
abstractNote = {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 A 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.},
doi = {10.1088/0004-637X/759/1/38},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 759,
place = {United States},
year = {2012},
month = {11}
}