Repozitorij Univerze v Novi Gorici

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Naslov:Electromagnetic emission of white dwarf binary mergers
Avtorji:ID Rueda, Jorge Armando (Avtor)
ID Ruffini, Remo (Avtor)
ID Wang, Yu (Avtor)
ID Bianco, Carlo Luciano (Avtor)
ID Blanco-Iglesias, J.M. (Avtor)
ID Karlica, Mile (Avtor)
ID Lorén-Aguilar, P. (Avtor)
ID Moradi, Rahim (Avtor)
ID Sahakyan, Narek (Avtor)
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Jezik:Angleški jezik
Vrsta gradiva:Delo ni kategorizirano
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:UNG - Univerza v Novi Gorici
Opis:It has been recently proposed that the ejected matter from white dwarf (WD) binary mergers can produce transient, optical and infrared emission similar to the "kilonovae" of neutron star (NS) binary mergers. To confirm this we calculate the electromagnetic emission from WD-WD mergers and compare with kilonova observations. We simulate WD-WD mergers leading to a massive, fast rotating, highly magnetized WD with an adapted version of the smoothed-particle-hydrodynamics (SPH) code Phantom. We thus obtain initial conditions for the ejecta such as escape velocity, mass and initial position and distribution. The subsequent thermal and dynamical evolution of the ejecta is obtained by integrating the energy-conservation equation accounting for expansion cooling and a heating source given by the fallback accretion onto the newly-formed WD and its magneto-dipole radiation. We show that magnetospheric processes in the merger can lead to a prompt, short gamma-ray emission of up to ≈ 1046 erg in a timescale of 0.1-1 s. The bulk of the ejecta initially expands non-relativistically with velocity 0.01 c and then it accelerates to 0.1 c due to the injection of fallback accretion energy. The ejecta become transparent at optical wavelengths around ~ 7 days post-merger with a luminosity 1041-1042 erg s-1. The X-ray emission from the fallback accretion becomes visible around ~ 150-200 day post-merger with a luminosity of 1039 erg s-1. We also predict the post-merger time at which the central WD should appear as a pulsar depending on the value of the magnetic field and rotation period.
Ključne besede:Astrophysics - High Energy Astrophysical Phenomena
Verzija publikacije:Objavljena publikacija
Leto izida:2019
Št. strani:13
Številčenje:2019, 03
PID:20.500.12556/RUNG-5657 Novo okno
COBISS.SI-ID:23022339 Novo okno
DOI:https://doi.org/10.1088/1475-7516/2019/03/044 Novo okno
NUK URN:URN:SI:UNG:REP:LPWEN8YL
Datum objave v RUNG:20.07.2020
Število ogledov:4397
Število prenosov:0
Metapodatki:XML DC-XML DC-RDF
:
RUEDA, Jorge Armando, RUFFINI, Remo, WANG, Yu, BIANCO, Carlo Luciano, BLANCO-IGLESIAS, J.M., KARLICA, Mile, LORÉN-AGUILAR, P., MORADI, Rahim in SAHAKYAN, Narek, 2019, Electromagnetic emission of white dwarf binary mergers. Journal of Cosmology and Astroparticle Physics [na spletu]. 2019. Vol. 2019, no. 03. [Dostopano 15 april 2025]. DOI https://doi.org/10.1088/1475-7516/2019/03/044. Pridobljeno s: https://repozitorij.ung.si/IzpisGradiva.php?lang=slv&id=5657
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Gradivo je del revije

Naslov:Journal of Cosmology and Astroparticle Physics
Skrajšan naslov:JCAP
Založnik:IOP Publishing Ltd and SISSA Medialab
Leto izida:2019

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