Three-dimensional delayed-detonation models with nucleosynthesis for Type Ia supernovae
Three-dimensional delayed-detonation models with nucleosynthesis for Type Ia supernovae
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DOI：
10.1093/mnras/sts402
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发表时间：
2012-11
影响因子：
4.8
通讯作者：
I. Seitenzahl;F. Ciaraldi-Schoolmann;F. Roepke;M. Fink;W. Hillebrandt;M. Kromer;R. Pakmor;A. Ruiter-A
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作者：
I. Seitenzahl;F. Ciaraldi-Schoolmann;F. Roepke;M. Fink;W. Hillebrandt;M. Kromer;R. Pakmor;A. Ruiter-A
我们提出了一套十四个三维，高分辨率流体动力学模拟延迟爆轰模型的Ia型超新星（SN Ia）爆炸的结果。该模型套件包括第一组具有详细同位素产率信息的三维SN I a模拟。因此，它可以作为一个数据库，用于计算质量延迟爆轰模型的核合成产额，并用于推导合成观测值，如光谱和光变曲线。我们采用了一个物理激励，随机模型的基础上湍流速度波动和燃料密度计算现场的爆燃到爆轰转变（DDT）的概率。为了获得爆燃阶段的不同强度，从而获得不同程度的预膨胀，我们选择了一系列初始模型，分别为1、3、5、10、20、40、100、150、200、300和1600（两种不同的实现）中心密度为2.9× 10 9 g cm −3的流体静力学白色矮星中的点火内核，另外还有一个高中心密度（5.5× 10 9 g cm −3）和一个低中心密度（1.0× 10 9 g cm −3）的100点火核心构型。对于每个模拟，我们确定了详细的核合成后处理106示踪粒子与384核素反应网络的产量。所有延迟爆炸模型的结果爆炸解除束缚的白色矮星，产生的范围56镍质量从0.32至1.11 M。一般来说，这些模型预测稳定的富中子铁族同位素并不是在最低速度下发现的，而是在中间速度（103，000 - 10，000 km s-1）下发现的。模型进一步预测了相对低速的氧和碳，典型的最小速度分别约为4，000和10，000 km s-1。
We present results for a suite of fourteen three-dimensional, high resolution hydrodynamical simulations of delayed-detonation models of Type Ia supernova (SN Ia) explosions. This model suite comprises the first set of three-dimensional SN I a simulations with detailed isotopic yield information. As such, it may serve as a database for Chandrasekhar-mass delayeddetonation model nucleosynthetic yields and for deriving synthetic observables such as spectra and light curves. We employ a physically motivated, stochastic model based on turbulent velocity fluctuations and fuel density to calculate in situ t he deflagration to detonation transition (DDT) probabilities. To obtain different strengths of the deflagration phase and thereby different degrees of pre-expansion, we have chosen a sequence of initial models with 1, 3, 5, 10, 20, 40, 100, 150, 200, 300, and 1600 (two different realizations) ignition kernels in a hydrostatic white dwarf with central density of 2.9× 10 9 g cm −3 , plus in addition one high central density (5.5× 10 9 g cm −3 ) and one low central density (1.0× 10 9 g cm −3 ) rendition of the 100 ignition kernel configuration. For each simulatio n we determined detailed nucleosynthetic yields by post-processing 10 6 tracer particles with a 384 nuclide reaction network. All delayed detonation models result in explosions unbinding the white dwarf, producing a range of 56 Ni masses from 0.32 to 1.11 M⊙. As a general trend, the models predict that the stable neutron-rich iron group isotopes are not found at the lowest velocities, but rather at intermediate velocities (∼3, 000− 10, 000 km s −1 ) in a shell surrounding a 56 Ni-rich core. The models further predict relatively low velocity oxygen and carbon, with typical minimum velocities around 4, 000 and 10, 000 km s −1 , respectively.