Particle-in-cell Simulations of Mildly Relativistic Outflows in Kilonova Emissions
The electromagnetic emission from neutron star mergers is comprised of multiple components. Synchrotron emission from the disk-powered jet and thermal emission from the merger ejecta (powered by a variety of sources) are among the most studied sources. The low masses and high velocities of the merge...
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| Veröffentlicht in: | The Astrophysical journal 2023-08, Vol.952 (2), p.165 |
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| creator | Rassel, Mohira Kilian, Patrick Aberham, Vito Spanier, Felix Lloyd-Ronning, Nicole Fryer, Chris L. |
| description | The electromagnetic emission from neutron star mergers is comprised of multiple components. Synchrotron emission from the disk-powered jet and thermal emission from the merger ejecta (powered by a variety of sources) are among the most studied sources. The low masses and high velocities of the merger ejecta quickly develop conditions where emission from collisionless shocks becomes critical and synchrotron emission from the merger ejecta constitutes a third component to the observed signal. The aim of this project is to examine shock development, magnetic field generation, and particle acceleration in the case of mildly relativistic shocks, which are expected when the tidal ejecta of neutron star mergers drive a shock into the external medium. Using LANL’s vector particle-in-cell (VPIC) code, we have run simulations of such mildly relativistic, collisionless, weakly magnetized plasmas and computed the resultant magnetic fields and particle energy spectra. We show the effects of varying plasma conditions, as well as explore the validity of using different proton-to-electron mass ratios in VPIC. Our results have implications for observing late-time electromagnetic counterparts to gravitational wave detections of neutron star mergers. |
| doi_str_mv | 10.3847/1538-4357/acd76a |
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| subjects | Astrophysics Ejecta Electron mass Energy spectra Gravitational waves Kilonovae Magnetic fields Mass ratios Neutron stars Neutrons Particle acceleration Particle energy Particle in cell technique Plasma astrophysics Relativistic effects Shocks Star mergers Stars Stellar winds Synchrotrons Thermal emission |
| title | Particle-in-cell Simulations of Mildly Relativistic Outflows in Kilonova Emissions |
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