Nonlinear Alfvén-wave Dynamics and Premerger Emission from Crustal Oscillations in Neutron Star Mergers

被引：2

作者：

Most, Elias R. ^{[1
,2
]}

Kim, Yoonsoo ^{[1
,3
]}

Chatziioannou, Katerina ^{[3
,4
]}

Legred, Isaac ^{[3
,4
]}

机构：

[1] CALTECH, TAPIR, Mailcode 350-17, Pasadena, CA 91125 USA

[2] CALTECH, Walter Burke Inst Theoret Phys, Pasadena, CA 91125 USA

[3] CALTECH, Dept Phys, Pasadena, CA 91125 USA

[4] CALTECH, LIGO Lab, Pasadena, CA 91125 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2024年 / 973卷 / 02期

基金：

美国国家科学基金会;

关键词：

EQUATION-OF-STATE; FAST RADIO-BURSTS; GAMMA-RAY BURST; GENERAL-RELATIVISTIC TREATMENT; SYNCHROTRON MASER EMISSION; RESONANT SHATTERING FLARES; INFRARED LIGHT CURVES; G-MODE RESONANCES; ELECTROMAGNETIC COUNTERPART; NUMERICAL SIMULATIONS;

D O I：

10.3847/2041-8213/ad785c

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Neutron stars have solid crusts threaded by strong magnetic fields. Perturbations in the crust can excite nonradial oscillations, which can in turn launch Alfv & eacute;n waves into the magnetosphere. In the case of a compact binary close to merger involving at least one neutron star, this can happen through tidal interactions causing resonant excitations that shatter the neutron star crust. We present the first numerical study that elucidates the dynamics of Alfv & eacute;n waves launched in a compact binary magnetosphere. We seed a magnetic field perturbation on the neutron star crust, which we then evolve in fully general-relativistic force-free electrodynamics using a GPU-based implementation. We show that Alfv & eacute;n waves steepen nonlinearly before reaching the orbital light cylinder, form flares, and dissipate energy in a transient current sheet. Our results predict radio and X-ray precursor emission from this process.

引用

页数：12

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