Presupernova Evolution and Explosive Nucleosynthesis of Rotating Massive Stars in the Metallicity Range-3 ≤ [Fe/H] ≤ 0
Presupernova Evolution and Explosive Nucleosynthesis of Rotating Massive Stars in the Metallicity Range-3 ≤ [Fe/H] ≤ 0
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DOI：
10.3847/1538-4365/aacb24
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发表时间：
2018-07-01
影响因子：
8.7
通讯作者：
Chieffi, Alessandro
中科院分区：
文献类型：
--
作者：
Limongi, Marco;Chieffi, Alessandro
我们提出了一个新的大质量恒星前超新星模型网格，其质量在13到120 M圆点之间，覆盖了四种金属丰度（即，[Fe/H] = 0、-1、-2和-3）和三个初始旋转速度（即，0、150和300 km s（-1））。爆炸已被模拟以下三个不同的假设，以显示如何的产量取决于剩余质量的初始质量关系。从H到Bi的扩展网络完全耦合到模型的物理演化。主要结果可归纳如下。(a)在太阳金属丰度下，最大质量的红超巨星（RSG）在非旋转的情况下爆炸为17 M圆点，更大质量的恒星爆炸为沃尔夫-拉叶星（WR）。相反，所有旋转的模型都爆炸成WR星。(b)核氦燃烧和氢燃烧壳层之间的相互作用，由旋转引起的不稳定性触发，驱动了大量的CNO的所有产物的合成，而不仅仅是N-14。其中一小部分极大地富集了He核的辐射部分（并导致大量F的产生），一小部分进入对流核，因此导致重要的初级中子通量能够合成重核，最高可达Pb。(c)在我们的方案中，从引力波的第一次探测（GW 150914，GW 151226，GW 170104，GW 170814）推断的剩余质量的顺序预测在所有金属丰度为零或中等的初始旋转速度。
We present a new grid of presupernova models of massive stars extending in mass between 13 and 120 M-circle dot, covering four metallicities (i.e., [Fe/H] = 0, -1, -2, and -3) and three initial rotation velocities (i.e., 0, 150, and 300 km s(-1)). The explosion has been simulated following three different assumptions in order to show how the yields depend on the remnant mass-initial mass relation. An extended network from H to Bi is fully coupled to the physical evolution of the models. The main results can be summarized as follows. (a) At solar metallicity, the maximum mass exploding as a red supergiant (RSG) is of the order of 17 M-circle dot in the nonrotating case, with the more massive stars exploding as Wolf-Rayet (WR) stars. All rotating models, conversely, explode as WR stars. (b) The interplay between the core He-burning and the H-burning shell, triggered by the rotation-induced instabilities, drives the synthesis of a large primary amount of all the products of CNO, not just N-14. A fraction of them greatly enriches the radiative part of the He core (and is responsible for the large production of F), and a fraction enters the convective core, leading therefore to an important primary neutron flux able to synthesize heavy nuclei up to Pb. (c) In our scenario, remnant masses of the order of those inferred from the first detections of gravitational waves (GW 150914, GW 151226, GW 170104, GW 170814) are predicted at all metallicities for none or moderate initial rotation velocities.