Nucleosynthesis in primordial hypernovae
Nucleosynthesis in primordial hypernovae
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DOI：
10.1093/mnras/sty1417
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发表时间：
2018-09-01
影响因子：
4.8
通讯作者：
Mueller, Bernhard
中科院分区：
文献类型：
--
作者：
Grimmett, J. J.;Heger, Alexander;Mueller, Bernhard
研究了第三星族超新星爆发能量与核合成的关系，给出了母星质量为15 M圆点、20 M圆点、30 M圆点、40 M圆点、60 M圆点和80 M圆点，爆发能量在10（50）erg和10（53）erg之间的恒星的核合成结果.我们认为，在贫金属星中观察到的典型丰度模式与原始质量在15 M圆点-30 M圆点范围内、爆炸能量类似于（5-10）× 10（51）尔格的超新星最匹配。在这些模型中，由不同组成的壳层之间密度的跳跃引起的反向激波有助于减少铬和锰的合成，这有利于匹配贫金属星中观测到的丰度，我们的模型的球对称爆炸与祖先质量>= 40 M圆点不提供与贫金属星中典型观测到的铁峰丰度相匹配的产额;然而，通过近似我们可能从这些模型中期望的高度非球面爆炸的产额，我们发现，具有双极喷流的40 M圆点- 80 M圆点恒星的爆炸可能是碳丰度增加的贫金属星富集源的良好候选者。
We investigate the relationship between explosion energy and nucleosynthesis in Population Ill supernovae and provide nucleosynthetic results for the explosions of stars with progenitor masses of 15 M-circle dot, 20 M-circle dot, 30 M-circle dot, 40 M-circle dot, 60 M-circle dot, and 80 M-circle dot, and explosion energies between approximately 10(50) erg and 10(53) erg. We and that the typical abundance pattern observed in metal-poor stars is best matched by supernovae with progenitor mass in the range 15 M-circle dot - 30 M-circle dot and explosion energy of similar to(5-10) x 10(51) erg, In these models, a reverse shock caused by jumps in density between shells of different composition serves to decrease synthesis of chromium and manganese, which is favourable to matching the observed abundances in metal-poor stars, Spherically symmetric explosions of our models with progenitor mass >= 40 M-circle dot do not provide yields that are compatible with the iron-peak abundances that are typically observed in metal-poor stars; however, by approximating the yields that we might expect from these models in highly aspherical explosions, we find indications that explosions of stars 40 M-circle dot - 80 M-circle dot with bipolar jets may he good candidates for the enrichment sources of metal-poor stars with enhanced carbon abundances.