# High-energy emissions from neutron star mergers

## TL;DR

This paper reviews the multi-messenger observations of neutron star mergers, especially GW170817, and discusses the potential for high-energy neutrino and cosmic-ray production from these events.

## Contribution

It provides a comprehensive overview of the electromagnetic and gravitational wave observations and explores the prospects for detecting high-energy particles from neutron star mergers.

## Key findings

- No high-energy neutrinos detected from GW170817
- Neutron star mergers can produce cosmic rays above the knee
- Relativistic jets may emit high-energy neutrinos if protons are present

## Abstract

In 2017, LIGO-Virgo collaborations reported detection of the first neutron star merger event, GW170817, which is accompanied by electromagnetic counterparts from radio to gamma rays. Although high-energy neutrinos were not detected from this event, mergers of neutron stars are expected to produce such high-energy particles. Relativistic jets are launched when neutron stars merge. If the jets contain protons, they can emit high-energy neutrinos through photomeson production. In addition, neutron star mergers produce massive and fast ejecta, which can be a source of Galactic high-energy cosmic rays above the knee. We briefly review what we learned from the multi-messenger event, GW170817, and discuss prospects for multi-messenger detections and hadronic cosmic-ray production related to the neutron star mergers.