Micro Tidal Disruption Events in Active Galactic Nuclei

Yang, Y.; Bartos, I.; Fragione, G.; Haiman, Z.; Kowalski, M.; Marka, S.; Perna, R.; Tagawa, H.

doi:10.48550/arxiv.2105.02342

Cited by 4 publications

(5 citation statements)

References 48 publications

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“…For the calculations of the diffuse neutrino background emission, we show that SNe Ia, kilonovae, CCSNe, GRB-SNe, and choked GRBs in AGN disks may contribute to 10% of the observed diffuse neutrino background. SNe (Grishin et al 2021), Bondi explosions of stellar BHs (Wang et al 2021a) and mTDEs (Yang et al 2021) are predicted to have very high event rate densities in AGN disks. Such energetic events can contribute more considerably to the diffuse neutrino background.…”

Section: Discussionmentioning

confidence: 99%

“…Very recently, the field of stellar explosions in AGN accretion disks is exploding. The event rates and possible observable signatures for several kinds of stellar explosions occurring in AGN disks, such as SNe (Zhu et al 2021b;Grishin et al 2021;Moranchel-Basurto et al 2021), gamma-ray bursts (GRBs; Cheng & Wang 1999;Perna et al 2021a;Zhu et al 2021c,a), NS mergers (McKernan et al 2020;Zhu et al 2021c), binary BH (BBH) mergers (e.g., McKernan et al 2012;Bartos et al 2017;Yang et al 2019Yang et al , 2020McKernan et al 2019;Graham et al 2020;Tagawa et al 2020Tagawa et al , 2021Wang et al 2021b), Bondi explosions (Wang et al 2021a), microtidal disruption events (mTDEs; Yang et al 2021) and accretion-induced collapses of WDs (Zhu et al 2021b) and NSs (Perna et al 2021b), have been investigated in detail. Different from the classical low-density environments in which these stellar explosions occur, the AGN environment allows the ejecta launched from AGN stellar explosions to interact with the AGN gaseous disk to drive an energetic shock.…”

Section: Introductionmentioning

confidence: 99%

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High-energy Neutrinos from Stellar Explosions in Active Galactic Nuclei Accretion Disks

Zhu,

Wang,

Zhang

2021

Preprint

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Some catastrophic stellar explosions, such as supernovae (SNe), compact binary coalescences, and micro-tidal disruption events, are believed to be embedded in the accretion disks of active galactic nuclei (AGN). We show high-energy neutrinos can be produced efficiently through pp-interactions between shock-accelerated cosmic rays and AGN disk materials shortly after the explosion ejecta shock breaks out of the disk. AGN stellar explosions are ideal targets for joint neutrino and electromagnetic (EM) multimessenger observations. Future EM follow-up observations of neutrino bursts can help us search for yet-discovered AGN stellar explosions. We suggest that AGN stellar explosions could potentially be important astrophysical neutrino sources. The contribution from AGN stellar explosions to the observed diffuse neutrino background depends on the uncertain local event rate densities of these events in AGN disks. By considering thermonuclear SNe, core-collaspe SNe, gamma-ray burst associated SNe, kilonovae, and choked GRBs in AGN disks with known theoretical local event rate densities, we show that these events may contribute to 10% of the observed diffuse neutrino background.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-energy Neutrinos from Stellar Explosions in Active Galactic Nuclei Accretion Disks

Zhu,

Wang,

Zhang

2021

Preprint

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“…In addition to the long and short GRB transients, other transients may also find a conducive environment to their production in AGN disks, and in particular tidal disruption events by stellar-mass black holes (Yang et al 2021), accretion-induced collapse of NSs (Perna et al 2021b;Pan & Yang 2021) and White Dwarfs (Zhu et al 2021b), jets from accreting BHs (Tagawa et al 2022) and binary BHs (Wang et al 2021a), super-kilonovae (Siegel et al 2021), BH-BH mergers (Bartos et al 2017;Graham et al 2020;Kaaz et al 2021), as well as supernovae (Grishin et al 2021).…”

Section: Introductionmentioning

confidence: 99%

The emergence of diffused gamma-ray burst afterglows from the discs of active galactic nuclei

Wang

Lazzati

Perna

2022

Monthly Notices of the Royal Astronomical Society

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The disks of Active Galactic Nuclei (AGNs) have emerged as rich environments for the production and capture of stars and the compact objects that they leave behind. These stars produce long Gamma-Ray Bursts (LGRBs) at their deaths, while frequent interactions among compact objects form binary neutron stars and neutron star-black hole binaries, leading to short GRBs (SGRBs) upon their merger. Predicting the properties of these transients as they emerge from the dense environments of AGN disks is key to their proper identification and to better constrain the star and compact object population in AGN disks. Some of these transients would appear unusual because they take place in much higher densities than the interstellar medium. Others, which are the subject of this paper, would additionally be modified by radiation diffusion, since they are generated within optically thick regions of the accretion disks. Here we compute the GRB afterglow light curves for diffused GRB sources for a representative variety of central black hole masses and disk locations. We find that the radiation from radio to UV and soft X-rays can be strongly suppressed by synchrotron self-absorption in the dense medium of the AGN disk. In addition, photon diffusion can significantly delay the emergence of the emission peak, turning a beamed, fast transient into a slow, isotropic, and dimmer one. These would appear as broadband-correlated AGN variability with a dominance at the higher frequencies. Their properties can constrain both the stellar populations within AGN disks as well as the disk structure.

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“…In addition, it has been noted how TDEs by BBHs can be used to constrain the formation history of star clusters (Samsing et al 2019a). Rates for TDEs by stellar BHs, whether isolated on in binaries, have been evaluated in AGN disks (Yang et al 2021) and in nuclear star clusters (Fragione et al 2021;Kremer et al 2021;Lopez et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Close Encounters of Stars with Stellar-mass Black Hole Binaries

Ryu¹,

Perna²,

Wang³

2022

Preprint

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Many astrophysical environments, from star clusters and globular clusters to the disks of Active Galactic Nuclei, are characterized by frequent interactions between stars and the compact objects that they leave behind. Here, using a suite of 3 − 𝐷 hydrodynamics simulations, we explore the outcome of close interactions between 1𝑀 stars and binary black holes (BBHs) in the gravitational wave regime, resulting in a tidal disruption event (TDE) or a pure scattering, focusing on the accretion rates, the back reaction on the BH binary orbital parameters and the increase in the binary BH effective spin. We find that TDEs can make a significant impact on the binary orbit, which is often different from that of pure scattering. Binaries experiencing a prograde (retrograde) TDE tend to be widened (hardened) by up to 20%. Initially circular binaries become more eccentric by 10% by a prograde or retrograde TDE, whereas the eccentricity of initially eccentric binaries increases (decreases) by a retrograde (prograde) TDE by 5%. Overall a single TDE can generally result in changes of the gravitational wave-driven merger time scale by order unity. The accretion rates of both black holes are very highly super-Eddington, showing modulations (preferentially for retrograde TDEs) on a time scale of the orbital period, which can be a characteristic feature of BBH-driven TDEs. Prograde TDEs result in the effective spin parameter 𝜒 to vary by 0.02 while 𝜒 −0.005 for retrograde TDEs.

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Micro Tidal Disruption Events in Active Galactic Nuclei

Cited by 4 publications

References 48 publications

High-energy Neutrinos from Stellar Explosions in Active Galactic Nuclei Accretion Disks

High-energy Neutrinos from Stellar Explosions in Active Galactic Nuclei Accretion Disks

The emergence of diffused gamma-ray burst afterglows from the discs of active galactic nuclei

Close Encounters of Stars with Stellar-mass Black Hole Binaries

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