The cocoon emission - an electromagnetic counterpart to gravitational waves from neutron star mergers

Abstract

Short Gamma-Ray Bursts (SGRBs) are believed to arise from compact binary mergers (either neutron star-neutron star or black hole-neutron star). If so their jets must penetrate outflows that are ejected during the merger. As a jet crosses the ejecta it dissipates its energy, producing a hot cocoon which surrounds it. We present here 3D numerical simulations of jet propagation in mergers' outflows and we calculate the resulting emission. This emission consists of two components: the cooling emission, the leakage of the thermal energy of the hot cocoon, and the cocoon macronova that arises from the radioactive decay of the cocoon's material. This emission gives a brief (~ one hour) blue, wide angle signal. While the parameters of the outflow and jet are uncertain, for the configurations we have considered the signal is bright (~ -14 $-$ -15 absolute magnitude) and outshines all other predicted UV-optical signals. The signal is brighter when the jet breakout time is longer and its peak brightness does not depend strongly on the highly uncertain opacity. A rapid search for such a signal is a promising strategy to detect an electromagnetic merger counterpart. A detected candidate could be then followed by deep IR searches for the longer but weaker macronova arising from the rest of the ejecta.

Accepted for publication in MNRAS

References in corpus (15)

• PLUTO: a Numerical Code for Computational Astrophysics
• Comprehensive nucleosynthesis analysis for ejecta of compact binary mergers
• Neutrino-driven winds from neutron star merger remnants
• Kilonova Light Curves from the Disk Wind Outflows of Compact Object Mergers
• Binary Neutron Star Mergers: Dependence on the Nuclear Equation of State
• Jet collimation in the ejecta of double neutron star merger: new canonical picture of short gamma-ray bursts
• The Observable Signatures of GRB Cocoons
• Off-axis emission of short gamma-ray bursts and the detectability of electromagnetic counterparts of gravitational wave detected binary mergers
• Neutron-powered precursors of kilonovae
• Mass ejection from neutron star mergers: different components and expected radio signals
• Necessary Conditions for Short Gamma-Ray Burst Production in Binary Neutron Star Mergers
• The Properties of Short gamma-ray burst Jets Triggered by neutron star mergers
• Numerically calibrated model for propagation of a relativistic unmagnetized jet in dense media
• Analytic heating rate of neutron star merger ejecta derived from Fermi's theory of beta decay
• Observational evidence for mass ejection accompanying short gamma ray bursts

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