Accretion-Induced Collapse of Neutron Stars in the Disks of Active Galactic Nuclei

Perna, Rosalba; Tagawa, Hiromichi; Haiman, Zoltan; Bartos, Imre

doi:10.48550/arxiv.2103.10963

Cited by 4 publications

(5 citation statements)

References 83 publications

(125 reference statements)

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“…The unique environments in AGN disks are expected to give rise to a wealth of other interesting phenomena, such as the tidal disruption of a star by a neutron star (albeit at a smaller rate of 0.1 Gpc −3 yr −1 ), the formation of Thorne-Zytkow objects (Thorne & Zytkow 1975) when a neutron star in the disk is unable to tidally disrupt a stellar companion due to a large stellar radius, the tidal disruption of white dwarfs by stellar-mass BHs, with unique signatures (Maguire et al 2020), and the accretion induced collapse of neutron stars (Perna et al 2021b) and white dwarfs (Zhu et al 2021a).…”

Section: Discussionmentioning

confidence: 99%

Micro Tidal Disruption Events in Active Galactic Nuclei

Yang,

Bartos,

Fragione

et al. 2021

Preprint

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Active galactic nuclei (AGNs) can act as black hole assembly lines, funneling some of the stellar-mass black holes from the vicinity of the galactic center into the inner plane of the AGN disk where the black holes can merge through dynamical friction and gravitational wave emission. Here, we show that stars near the galactic center are also brought into the AGN disk, where they can be tidally disrupted by the stellar-mass black holes in the disk. Such micro-tidal disruption events (micro-TDEs) could be useful probe of stellar interaction with the AGN disk. We find that micro-TDEs in AGNs occur at a rate of ∼ 170 Gpc −3 yr −1 . Their cleanest observational probe may be the detection of tidal disruption in AGNs by heavy supermassive black holes (M • 10 8 M ) so that cannot tidally disrupt solar-type stars. We discuss two such TDE candidates observed to date (ASASSN-15lh and ZTF19aailpwl).

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Section: Discussionmentioning

confidence: 99%

Micro Tidal Disruption Events in Active Galactic Nuclei

Yang,

Bartos,

Fragione

et al. 2021

Preprint

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“…McKernan et al (2020) simulated the relative rate of BWD mergers in AGN disks and obtained f AGN [0.2, 5000] Gpc −3 yr −1 , where f AGN is defined as the observed rate of binary BH mergers come from AGNs. Perna et al (2021b) computed the rates of AICs of NSs to BHs for both isolated NSs and NSs formed from BNS mergers, which are ∼ [0.07, 20] Gpc −3 yr −1 , respectively. Considering that the number of WDs in AGN disks could be comparable to the number of AGN NSs (McKernan et al 2020), one may estimate that the rate of thermonuclear explosions and AICs of AGN WDs could be approximately up to this rate.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…As this work was being finalized, we noticed the work byPerna et al (2021b). Different from our work that focuses on the EM signatures of AIC of WDs in AGNs, they discussed the event rates and observable prospects of AIC of NSs to BHs in AGNs.…”

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confidence: 95%

Thermonuclear Explosions and Accretion-induced Collapses of White Dwarfs in Active Galactic Nucleus Accretion Disks

Zhu,

Yang,

Zhang

et al. 2021

Preprint

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White dwarfs (WDs) embedded in gaseous disks of active galactic nucleus (AGNs) can rapidly accrete materials from the disks and grow in mass to reach or even exceed the Chandrasekhar limit. Binary WD (BWD) mergers are also believed to occur in AGN accretion disks. We study observational signatures from these events. We suggest that mass-accreting WDs and BWD mergers in AGN disks can lead to thermonuclear explosions that drive an ejecta shock breakout from the disk surface and power a slow-rising, relatively dim Type Ia supernova (SN). Such SNe Ia may be always outshone by the emission of the AGN disk around the supermassive black hole (BH) with a mass of M SMBH 10 8 M . Besides, accretion-induced collapses (AICs) of WDs in AGN disks may occur sometimes, which may form highly-magnetized millisecond neutron stars (NSs). The subsequent spin-down process of this nascent magnetar can deposit its rotational energy into the disk materials, resulting in a magnetardriven shock breakout and a luminous magnetar-powered transient. We show that such an AIC event could power a rapidly evolving and luminous transient for a magnetic field of B ∼ 10 15 G. The rising time and peak luminosity of the transient, powered by a magnetar with B ∼ 10 14 G, are predicted to have similar properties with those of superluminous supernovae. AIC events taking place in the inner parts of the disk around a relatively less massive supermassive BHs (M SMBH 10 8 M ) are more likely to power the transients that are much brighter than the AGN disk emission and hence easily to be identified.

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“…Besides classical GRBs from core collapse of massive stars, neutron star mergers and binary BH mergers (e.g., Bartos et al 2017;Kaaz et al 2021;Kimura et al 2021), accretion of a single BH (Wang et al 2021) and accretion-induced collapse of NSs (Perna et al 2021b) embedded within AGN disks were also studied recently. Such jets driven by embedded AGN objects could potentially be choked as well and hence produce high-energy neutrinos.…”

Section: Chokedmentioning

confidence: 99%

High Energy Neutrinos from Choked Gamma-Ray Bursts in AGN Accretion Disks

Zhu,

Wang,

Zhang

et al. 2021

Preprint

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Both long-duration gamma-ray bursts (LGRBs) from core collapse of massive stars and shortduration GRBs (SGRBs) from mergers of binary neutron star (BNS) or neutron star-black hole (NSBH) are expected to occur in the accretion disk of active galactic nuclei (AGNs). We show that GRB jets embedded in the migration traps of AGN disks are promised to be choked by the dense disk material. Efficient shock acceleration of cosmic rays at the reverse shock is expected, and high-energy neutrinos would be produced. We find that these sources can effectively produce detectable TeV-PeV neutrinos through pγ interactions. From a choked LGRB jet with isotropic equivalent energy of 10 53 erg at 100 Mpc, one expects ∼ 2 (7) neutrino events detectable by IceCube (IceCube-Gen2). The contribution from choked LGRBs to the observed diffuse neutrino background depends on the unknown local event rate density of these GRBs in AGN disks. For example, if the local event rate density of choked LGRBs in AGN disk is ∼ 5% that of low-luminosity GRBs (∼ 10 Gpc −3 yr −1 ), the neutrinos from these events would contribute to ∼ 10% of the observed diffuse neutrino background. Choked SGRBs in AGN disks are potential sources for future joint electromagnetic, neutrino, and gravitational wave multi-messenger observations.

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Accretion-Induced Collapse of Neutron Stars in the Disks of Active Galactic Nuclei

Cited by 4 publications

References 83 publications

Micro Tidal Disruption Events in Active Galactic Nuclei

Micro Tidal Disruption Events in Active Galactic Nuclei

Thermonuclear Explosions and Accretion-induced Collapses of White Dwarfs in Active Galactic Nucleus Accretion Disks

High Energy Neutrinos from Choked Gamma-Ray Bursts in AGN Accretion Disks

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