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Optical Emission fromAspherical Supernovaeand the Hypernova SN1998bw Keiichi MaedaP. A. MazzaliK. Nomoto2006 год

Optical Emission from Aspherical Supernovae and the Hypernova SN 1998bw
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Аннотация: A fully 3D Monte Carlo scheme is applied to compute optical bolometric light curves for aspherical (jet-like) supernova explosion models. Density and abundance distributions are taken from hydrodynamic explosion models, with the energy varied as a parameter to explore the dependence. Our models show initially a very large degree ($\sim 4$ depending on model parameters) of boosting luminosity toward the polar ($z$) direction relative to the equatorial ($r$) plane, which decreases as the time of peak is approached. After the peak, the factor of the luminosity boost remains almost constant ($\sim 1.2$) until the supernova enters the nebular phase. This behavior is due mostly to the aspherical $^{56}$Ni distribution in the earlier phase and to the disk-like inner low-velocity structure in the later phase. Also the aspherical models yield an earlier peak date than the spherical models, especially if viewed from near the z-axis. Aspherical models with ejecta mass $\sim 10\Msun$ are examined, and one with the kinetic energy of the expansion $\sim 2 \pm 0.5 \times 10^{52}$ ergs and a mass of $^{56}$Ni $\sim 0.4\Msun$ yields a light curve in agreement with the observed light curve of SN 1998bw (the prototypical hyper-energetic supernova). The aspherical model is also at least qualitatively consistent with evolution of photospheric velocities, showing large velocities near the z-axis, and with a late-phase nebular spectrum. The viewing angle is close to the z-axis, strengthening the case for the association of SN 1998bw with the gamma ray burst GRB980425.
Год издания: 2006
Авторы: Keiichi Maeda, P. A. Mazzali, K. Nomoto
Издательство: IOP Publishing
Источник: The Astrophysical Journal
Ключевые слова: Gamma-ray bursts and supernovae, Pulsars and Gravitational Waves Research, Stellar, planetary, and galactic studies
Другие ссылки: The Astrophysical Journal (HTML)
arXiv (Cornell University) (PDF)
DataCite API (HTML)