Impact of an improved neutrino energy estimate on outflows in neutron star merger simulations

被引：135

作者：

Foucart, Francois ^{[1
]}

O'Connor, Evan ^{[2
]}

Roberts, Luke ^{[3
]}

Kidder, Lawrence E. ^{[4
]}

Pfeiffer, Harald P. ^{[5
]}

Scheel, Mark A. ^{[3
]}

机构：

[1] Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA

[2] North Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA

[3] CALTECH, Walter Burke Inst Theoret Phys, TAPIR, MC 350-17, Pasadena, CA 91125 USA

[4] Cornell Univ, Ctr Radiophys & Space Res, Ithaca, NY 14853 USA

[5] Univ Toronto, Canadian Inst Theoret Astrophys, Toronto, ON M5S 3H8, Canada

来源：

PHYSICAL REVIEW D | 2016年 / 94卷 / 12期

基金：

美国国家科学基金会; 加拿大自然科学与工程研究理事会; 加拿大创新基金会; 美国国家航空航天局;

关键词：

EQUATION-OF-STATE; GAMMA-RAY BURSTS; R-PROCESS; DYNAMICAL EJECTA; GRAVITATIONAL-WAVES; RADIATIVE-TRANSFER; PHYSICAL MODELS; MASS; EVOLUTION; WIND;

D O I：

10.1103/PhysRevD.94.123016

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Binary neutron star mergers are promising sources of gravitational waves for ground-based detectors such as Advanced LIGO. Neutron-rich material ejected by these mergers may also be the main source of r-process elements in the Universe, while radioactive decays in the ejecta can power bright electromagnetic postmerger signals. Neutrino-matter interactions play a critical role in the evolution of the composition of the ejected material, which significantly impacts the outcome of nucleosynthesis and the properties of the associated electromagnetic signal. In this work, we present a simulation of a binary neutron star merger using an improved method for estimating the average neutrino energies in our energy-integrated neutrino transport scheme. These energy estimates are obtained by evolving the neutrino number density in addition to the neutrino energy and flux densities. We show that significant changes are observed in the composition of the polar ejecta when comparing our new results with earlier simulations in which the neutrino spectrum was assumed to be the same everywhere in optically thin regions. In particular, we find that material ejected in the polar regions is less neutron rich than previously estimated. Our new estimates of the composition of the polar ejecta make it more likely that the color and time scale of the electromagnetic signal depend on the orientation of the binary with respect to an observer's line of sight. These results also indicate that important observable properties of neutron star mergers are sensitive to the neutrino energy spectrum, and may need to be studied through simulations including a more accurate, energy-dependent neutrino transport scheme.

引用

页数：20

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