Tidally disrupted stars as a possible origin of both cosmic rays and neutrinos at the highest energies

Biehl, Daniel; Boncioli, D.; Lunardini, Cecilia; Winter, Walter

doi:10.1038/s41598-018-29022-4

Cited by 101 publications

(104 citation statements)

References 80 publications

(126 reference statements)

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“…The very hard spectra found in this case are consistent with what was found for example in Taylor et al (2015). The 3σ contours leave room for negatively evolving sources such as TDEs (Biehl et al 2018b).…”

Section: Baseline Case Characteristicssupporting

confidence: 89%

A New View on Auger Data and Cosmogenic Neutrinos in Light of Different Nuclear Disintegration and Air-shower Models

Heinze¹,

Fedynitch²,

Boncioli³

et al. 2019

ApJ

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111

178

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We study the implications of Ultra-High Energy Cosmic Ray (UHECR) data from the Pierre Auger Observatory for potential accelerator candidates and cosmogenic neutrino fluxes for different combinations of nuclear disintegration and air-shower models. We exploit the most recent spectral and mass composition data (2017) with a new, computationally efficient simulation code PriNCe. We extend a systematic framework, which has been previously applied in a combined fit by the Pierre Auger Collaboration, with the cosmological source evolution as an additional free parameter. In this framework, an ensemble of generalized UHECR accelerators is characterized by a universal spectral index (equal for all injection species), a maximal rigidity, and the normalizations for five nuclear element groups. We find that the 2017 data favor a small but constrained contribution of heavy elements (iron) at the source. We demonstrate that the results moderately depend on the nuclear disintegration (PSB, Peanut, or Talys) model, and more strongly on the air-shower (EPOS-LHC, Sibyll-2.3, or QGSjet-II-04) model. Variations of these models result in different source evolutions and spectral indices, limiting the interpretation in terms of a particular class of cosmic accelerators. Better constrained parameters include the maximal rigidity and the mass composition at the source. Hence, the cosmogenic neutrino flux can be robustly predicted. Depending on the source evolution at high redshifts the flux is likely out of reach of future neutrino observatories in most cases, and a minimal cosmogenic neutrino flux cannot be claimed from data without assuming a cosmological distribution of the sources.

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Section: Baseline Case Characteristicssupporting

confidence: 89%

A New View on Auger Data and Cosmogenic Neutrinos in Light of Different Nuclear Disintegration and Air-shower Models

Heinze¹,

Fedynitch²,

Boncioli³

et al. 2019

ApJ

Self Cite

111

178

View full text Add to dashboard Cite

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“…However, the target photon spectrum is only measured in a small energy band and its behaviour beyond that is uncertain. In Murase et al (2016); Biehl et al (2018b), it has been shown that, depending on the spectral indices, the source can be optically thick to gamma-rays ranging from MeV to PeV. For the spectral indices we use in this work, gamma-rays even beyond PeV energies could be trapped.…”

Section: Resultsmentioning

confidence: 99%

On the Common Origin of Cosmic Rays across the Ankle and Diffuse Neutrinos at the Highest Energies from Low-luminosity Gamma-Ray Bursts

Boncioli

Biehl

Winter

2019

ApJ

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We demonstrate that the UHECRs produced in the nuclear cascade in the jet of Low-Luminosity Gamma-Ray Bursts (LL-GRBs) can describe the UHECR spectrum and composition and, at the same time, the diffuse neutrino flux at the highest energies. The radiation density in the source simultaneously controls the neutrino production and the development of the nuclear cascade, leading to a flux of nucleons and light nuclei describing even the cosmic-ray ankle at 5 · 10 18 eV. The derived source parameters are consistent with population studies, indicating a baryonic loading factor of about ten. Our results motivate the continued experimental search of LL-GRBs as a unique GRB population.

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“…The general conclusion is that the models can reproduce both the composition and energy spectrum of UHECRs (Zhang et al 2017, note that O-Ne-Mg white dwarfs lead to better agreement). The implied TDE rates range between 0.1 yr −1 Gpc −1 (Biehl et al 2018) and 10 yr −1 Gpc −1 (Alves Batista and Silk 2017) but these are inversely proportional to the baryon loading of the jets (the ratio of proton to photon luminosities) and proportional to the IMBH occupation fraction (see Section 6.3). In view of the uncertainties in these parameters, the rates reported in this paragraph are not incompatible with those of Section 6.3.…”

Section: Ultra-high Energy Cosmic Rays From Tde Jets and Other Outflowsmentioning

confidence: 99%

Tidal Disruptions of White Dwarfs: Theoretical Models and Observational Prospects

et al. 2020

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White dwarf stars that enter the tidal radius of black holes with masses < ∼ 10 5 M are doomed to be ripped apart by tidal forces. Black holes in this mass range between stellar black holes and supermassive black holes have not been conclusively identified so the detection of a tidal disruption of a white dwarf would provide clear evidence for the existence of intermediatemass black holes. In this review, we present a theoretical and observational overview of the transient events that result from the tidal disruptions of white dwarfs by intermediate-mass black holes. This includes discussion of the latest simulations and predicted properties, the results of observational searches, as well as a summary of the potential for gravitational wave emission to be detected with upcoming missions.

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Tidally disrupted stars as a possible origin of both cosmic rays and neutrinos at the highest energies

Cited by 101 publications

References 80 publications

A New View on Auger Data and Cosmogenic Neutrinos in Light of Different Nuclear Disintegration and Air-shower Models

A New View on Auger Data and Cosmogenic Neutrinos in Light of Different Nuclear Disintegration and Air-shower Models

On the Common Origin of Cosmic Rays across the Ankle and Diffuse Neutrinos at the Highest Energies from Low-luminosity Gamma-Ray Bursts

Tidal Disruptions of White Dwarfs: Theoretical Models and Observational Prospects

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