Neutrinos and gravitational waves from magnetized neutrino-dominated accretion discs with magnetic coupling

Abstract

Gamma-ray bursts (GRBs) might be powered by a black hole (BH) hyperaccretion systems via the Blandford-Znajek (BZ) mechanism or neutrino annihilation from neutrino-dominated accretion flows (NDAFs). Magnetic coupling (MC) between the inner disc and BH can transfer angular momentum and energy from the fast-rotating BH to the disc. The neutrino luminosity and neutrino annihilation luminosity are both efficiently enhanced by the MC process. In this paper, we study the structure, luminosity, MeV neutrinos, and gravitational waves (GWs) of magnetized NDAFs (MNDAFs) under the assumption that both the BZ and MC mechanisms are present. The results indict that the BZ mechanism will compete with the neutrino annihilation luminosity to trigger jets under the different partitions of the two magnetic mechanisms. The typical neutrino luminosity and annihilation luminosity of MNDAFs are definitely higher than those of NDAFs. The typical peak energy of neutrino spectra of MNDAFs is higher than that of NDAFs, but similar to those of core-collapse supernovae. Moreover, if the MC process is dominant, then the GWs originating from the anisotropic neutrino emission will be stronger particularly for discs with high accretion rates.

Anisotropic multimessenger signals from black hole neutrino-dominated accretion flows with outflows in binary compact object mergers

“…(1978) first proposed GW radiation resulting from anisotropic neutrinos, and the methods have been applied to CCSNe (e.g., Burrows & Hayes 1996;Kotake et al 2006Kotake et al , 2007. GWs arising from anisotropic neutrino emission in NDAFs have been investigated (e.g., Suwa & Murase 2009;Kotake et al 2012;Liu et al 2017b;Song et al 2020;. Liu et al (2017b) examined the BH spin and accretion rate impacts on the strains of GWs in NDAFs; compared their strains, frequencies, and detection possi- bility to those from magnetars; and presented no GW emission from the BZ mechanism (Blandford & Znajek 1977).…”

“…MeV neutrinos from core-collapse SNe (CCSNe, e.g., Friedland 2010;Warren et al 2020) and their central NDAFs (e.g., Liu et al 2016;Wei et al 2019;Song et al 2020) have been investigated. Although the neutrino luminosity of NDAFs is 1 − 3 orders of magnitude lower than that of CCSNe, a certain number of neutrinos could still be detected in the Local Group by prospective detectors (e.g., Liu et al 2016).…”

“…This type of accretion disk is named a neutrino-dominated accretion flow (NDAF, e.g., Popham et al 1999;Narayan et al 2001;Di Matteo et al 2002;Kohri & Mineshige 2002;Kohri et al 2005;Lee et al 2005;Gu et al 2006;Chen & Beloborodov 2007;Kawanaka & Mineshige 2007;Liu et al 2007;Kawanaka et al 2013;Xue et al 2013); for reviews, see Liu et al (2017a) and Zhang (2018). Neutrino emission and GWs induced by the jet precession or anisotropic neutrinos in the NDAF model have been investigated (e.g., Suwa & Murase 2009;Romero et al 2010;Sun et al 2012;Liu et al 2016Liu et al , 2017bSong et al 2018Song et al , 2020Wei et al 2019;. Besides that, the Blandford-Znajek (BZ) mechanism (Blandford & Znajek 1977) is another way to release energy in BH hyperaccretion scenario.…”

Testing Blandford-Znajek mechanism in black hole hyperaccretion flows for long-duration gamma-ray bursts

“…Neutrino annihilation and BZ mechanism might coexist in NDAF with magnetic coupling (MC), and compete with each other. Variations in the proportions of the BZ and MC components lead to changes in the dominance of the BZ power and the neutrino annihilation luminosity (e.g., Lei et al 2009;Song et al 2020).…”

Relativistic global solutions of neutrino-dominated accretion flows with magnetic coupling

“…As one of candidates of GRB central engines, the neutrino-dominated accretion flow (NDAF) has been used to explain many characteristics of GRBs in past two decades, such as GRB jet luminosities powered by the annihilations of neutrinos escaping from the discs (e.g. Popham, Woosley, & Fryer 1999;Fryer et al 1999 Song, Liu, & Wei 2020), variabilities in GRB prompt emissions driven by the instabilities of the discs (e.g. Reynoso, Romero, & Sampayo 2006;Janiuk et al 2007;Kawanaka & Mineshige 2007;Lei et al 2009Lei et al , 2017Liu et al 2010;Carballido & Lee 2011;Kawanaka & Kohri 2012;Kawanaka, Piran, & Krolik 2013;Hou et al 2014;Kimura, Mineshige, & Kawanaka 2015;Lin et al 2016;Kawanaka & Masada 2019;Shahamat, Abbassi, & Liu 2021), extended emissions following short-duration GRBs induced by the redistribution of the angular momenta of the discs (e.g.…”