Supernova neutrinos, neutrino oscillations, and the mass of the progenitor star
Supernova neutrinos, neutrino oscillations, and the mass of the progenitor star
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超新星中微子、中微子振荡和祖星的质量
DOI：
10.1103/physrevd.68.113009
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发表时间：
2003
影响因子：
5
通讯作者：
T. Thompson
中科院分区：
文献类型：
--
作者：
Keitaro Takahashi;Katsuhiko Sato;A. Burrows;T. Thompson
考虑到中微子振荡，我们研究了超新星早期中微子信号的初始祖质量依赖性。早期分析的优点在于不受恒星因激波传播而导致的密度结构随时间演化的影响，也不受残余物是中子星还是黑洞的影响。初始质量影响大质量恒星的演化及其前超新星结构，这在考虑中微子信号时很重要，原因有二。首先，地幔的密度分布影响超新星中中微子振荡的动力学。其次，最终的铁核结构决定了中微子爆发的特征，即光度和平均能量。我们发现这两种影响都很小。当我们试图从未来的超新星-中微子观测中提取有关中微子参数的信息时，这是可取的。虽然由于祖质量的不确定性对于中间的${\ensuremath{\theta}}_{13}$${(10}^{\ensuremath{-}5}\ensuremath{\lesssim}{\mathrm{sin}}^{2}2{\ensuremath{\theta}}_{13}\ensuremath{\lesssim}{10}^{\ensuremath{-}3}),$并不小，但是我们可以提取关于质量层次的特征以及${\ensuremath{\theta}}_{13}$是非常大还是非常小的信息。
We investigate the initial progenitor mass dependence of the early-phase neutrino signal from supernovae taking neutrino oscillations into account. The early-phase analysis has advantages in that it is not affected by the time evolution of the density structure of the star due to shock propagation or whether the remnant is a neutron star or a black hole. The initial mass affects the evolution of the massive star and its presupernova structure, which is important for two reasons when considering the neutrino signal. First, the density profile of the mantle affects the dynamics of neutrino oscillation in supernova. Second, the final iron core structure determines the features of the neutrino burst, i.e., the luminosity and the average energy. We find that both effects are rather small. This is desirable when we try to extract information on neutrino parameters from future supernova-neutrino observations. Although the uncertainty due to the progenitor mass is not small for intermediate ${\ensuremath{\theta}}_{13}$ ${(10}^{\ensuremath{-}5}\ensuremath{\lesssim}{\mathrm{sin}}^{2}2{\ensuremath{\theta}}_{13}\ensuremath{\lesssim}{10}^{\ensuremath{-}3}),$ we can, nevertheless, extract information on the character of the mass hierarchy and whether ${\ensuremath{\theta}}_{13}$ is very large or very small.