Actinide-Boosting r Process in Black-Hole-Neutron-Star Merger Ejecta

被引：4

作者：

Wanajo, Shinya ^{[1
,2
]}

Fujibayashi, Sho ^{[1
,2
,3
]}

Hayashi, Kota ^{[1
,4
]}

Kiuchi, Kenta ^{[1
,4
]}

Sekiguchi, Yuichiro ^{[4
,5
]}

Shibata, Masaru ^{[1
,4
]}

机构：

[1] Max Planck Inst Gravitat Phys, Albert Einstein Inst, Muhlenberg 1, D-14476 Potsdam, Germany

[2] Tohoku Univ, Astron Inst, Grad Sch Sci, Sendai 9808578, Japan

[3] Tohoku Univ, Frontier Res Inst Interdisciplinary Sci, Sendai 9808578, Japan

[4] Kyoto Univ, Yukawa Inst Theoret Phys, Ctr Gravitat Phys & Quantum Informat, Kyoto 6068502, Japan

[5] Toho Univ, Dept Phys, Funabashi, Chiba 2748510, Japan

来源：

PHYSICAL REVIEW LETTERS | 2024年 / 133卷 / 24期

关键词：

EQUATION-OF-STATE; PROCESS NUCLEOSYNTHESIS; SUPERNOVA EQUATIONS; 1ST STARS; MILKY-WAY; DECAY; UNCERTAINTIES; ELEMENTS; FISSION; WINDS;

D O I：

10.1103/PhysRevLett.133.241201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We examine nucleosynthesis in the ejecta of black-hole-neutron-star mergers based on the results of long-term neutrino-radiation-magnetohydrodynamics simulations for the first time. We find that the combination of dynamical and postmerger ejecta reproduces a solarlike r-process pattern. Moreover, the enhancement level of actinides is highly sensitive to the distribution of both the electron fraction and the velocity of the dynamical ejecta. Our result implies that the mean electron fraction of dynamical ejecta should be greater than or similar to 0.05 in order to reconcile the nucleosynthetic abundances with those in r-process-enhanced, actinide-boost stars. Since the tidal ejecta preserve the neutron richness in the inner crust of premerging neutron stars, this result provides an important constraint for nuclear equations of state if black-hole- neutron-star mergers are responsible for actinide-boost stars.

引用

页数：6

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[1] Commentary on Currie et al. (2017): Low-risk gambling limits-a bridge too far? [J].