r-process nucleosynthesis from matter ejected in binary neutron star mergers

被引:141
|
作者
Bovard, Luke [1 ]
Martin, Dirk [2 ,3 ]
Guercilena, Federico [1 ]
Arcones, Almudena [2 ,3 ]
Rezzolla, Luciano [1 ,4 ]
Korobkin, Oleg [5 ]
机构
[1] Goethe Univ Frankfurt, Inst Theoret Phys, Max von Laue Str 1, D-60438 Frankfurt, Germany
[2] Tech Univ Darmstadt, Inst Kernphys, Schlossgartenstr 9, D-64289 Darmstadt, Germany
[3] GSI Helmholtzzentrum Schwerionenforsch GmbH, Planckstr 1, D-64291 Darmstadt, Germany
[4] Frankfurt Inst Adv Studies, Ruth Moufang Str 1, D-60438 Frankfurt, Germany
[5] Los Alamos Natl Lab, Ctr Theoret Astrophys, Los Alamos, NM 87545 USA
基金
欧洲研究理事会;
关键词
GAMMA-RAY BURSTS; ASTROPHYSICAL REACTION-RATES; HIGH-RESOLUTION CALCULATIONS; CORE-COLLAPSE SUPERNOVAE; DYNAMICAL MASS EJECTION; COMPACT OBJECT MERGERS; EQUATION-OF-STATE; ELECTROMAGNETIC SIGNALS; ACCRETION DISCS; DRIVEN WINDS;
D O I
10.1103/PhysRevD.96.124005
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
When binary systems of neutron stars merge, a very small fraction of their rest mass is ejected, either dynamically or secularly. This material is neutron-rich and its nucleosynthesis provides the astrophysical site for the production of heavy elements in the Universe, together with a kilonova signal confirming neutron-star mergers as the origin of short gamma-ray bursts. We perform full general-relativistic simulations of binary neutron-star mergers employing three different nuclear-physics equations of state ( EOSs), considering both equal-and unequal-mass configurations, and adopting a leakage scheme to account for neutrino radiative losses. Using a combination of techniques, we carry out an extensive and systematic study of the hydrodynamical, thermodynamical, and geometrical properties of the matter ejected dynamically, employing the WinNet nuclear-reaction network to recover the relative abundances of heavy elements produced by each configurations. Among the results obtained, three are particularly important. First, we find that, within the sample considered here, both the properties of the dynamical ejecta and the nucleosynthesis yields are robust against variations of the EOS and masses. Second, using a conservative but robust criterion for unbound matter, we find that the amount of ejected mass is less than or similar to 10(-3) M-circle dot, hence at least one order of magnitude smaller than what normally assumed in modelling kilonova signals. Finally, using a simplified and gray-opacity model we assess the observability of the infrared kilonova emission finding, that for all binaries the luminosity peaks around similar to 1/2 day in the H-band, reaching a maximum magnitude of -13, and decreasing rapidly after one day.
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页数:25
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