On the role of a cavity in the hypernova ejecta of GRB 190114C

Abstract

Within the binary-driven hypernova I (BdHN I) scenario, the gamma-ray burst GRB190114C originates in a binary system composed of a massive carbon-oxygen core (CO${}_{core}$), and a binary neutron star (NS) companion. As the CO${}_{core}$ undergoes a supernova explosion with the creation of a new neutron star ($\nu$NS), hypercritical accretion occurs onto the companion binary neutron star until it exceeds the critical mass for gravitational collapse. The formation of a black hole (BH) captures $10^{57}$ baryons by enclosing them within its horizon, and thus a cavity of approximately $10^{11}$ cm is formed around it with initial density $10^{-7}$ g/cm${}^3$. A further depletion of baryons in the cavity originates from the expansion of the electron-positron-photon ($e^{+}{e}^{-}\gamma$) plasma formed at the collapse, reaching a density of $10^{-14}$ g/cm${}^3$ by the end of the interaction. It is demonstrated here using an analytical model complemented by a hydrodynamical numerical simulation that part of the $e^{+}{e}^{-}\gamma$ plasma is reflected off the walls of the cavity. The consequent outflow and its observed properties are shown to coincide with the featureless emission occurring in a time interval of duration $t_{rf}$, measured in the rest frame of the source, between $11$ and $20$ s of the GBM observation. Moreover, similar features of the GRB light curve were previously observed in GRB 090926A and GRB 130427A, all belonging to the BdHN I class. This interpretation supports the general conceptual framework presented in Ruffini et al. (2019) and guarantees that a low baryon density is reached in the cavity, a necessary condition for the operation of the "inner engine" of the GRB presented in an accompanying article (Ruffini & Moradi 2019).

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Cited by in corpus (18)

• On the GeV emission of the type I BdHN GRB 130427A
• Gravitomagnetic interaction of a Kerr black hole with a magnetic field as the source of the jetted GeV radiation of gamma-ray bursts
• The blackholic quantum
• The newborn black hole in GRB 191014C proves that it is alive
• Magnetic Fields and Afterglows of BdHNe: Inferences from GRB 130427A, GRB 160509A, GRB 160625B, GRB 180728A and GRB 190114C
• The morphology of the X-ray afterglows and of the jetted GeV emission in long GRBs
• Nature of the ultrarelativistic prompt emission phase of GRB 190114C
• GRB-SN Association within the Binary-Driven Hypernova Model
• Induced Gravitational Collapse, Binary-Driven Hypernovae, Long Gramma-ray Bursts and Their Connection with Short Gamma-ray Bursts
• The structure of the ultrarelativistic prompt emission phase and the properties of the black hole in GRB 180720B
• On the X-ray, optical and radio afterglows of the BdHN I GRB 180720B generated by the synchrotron emission
• Evidence for the transition of a Jacobi ellipsoid into a Maclaurin spheroid in gamma-ray bursts
• A Brief Review of Binary Driven Hypernova
• Neutrino oscillations in a neutrino-dominated accretion disk around a Kerr BH
• Probing electromagnetic-gravitational wave emission coincidence in type I binary-driven hypernova family of long GRBs at very-high redshift
• Self-Similarities and Power-laws in the Time-resolved Spectra of GRB 190114C, GRB 130427A, GRB 160509A, and GRB 160625B
• The Quantum Emission of an Alive Black Hole
• MeV, GeV and TeV neutrinos from binary-driven hypernovae