Observing Supernova Neutrino Light Curves with Super-Kamiokande. IV. Development of SPECIAL BLEND: A New Public Analysis Code for Supernova Neutrinos

Harada, Akira; Suwa, Yudai; Harada, Masayuki; Koshio, Yusuke; Mori, Masamitsu; Nakanishi, Fumi; Nakazato, Ken’ichiro; Sumiyoshi, Kohsuke; Wendell, Roger A.

doi:10.3847/1538-4357/ace52e

Cited by 3 publications

(1 citation statement)

References 44 publications

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“…If we cover full parameter space, we may be able to infer the EOS parameters or accretion rates from the future neutrino detection. An analysis pipeline based on a Bayesian approach has been already developed for thermal neutrino detection (Harada et al 2023a). The results with similar approach will be reported elsewhere.…”

Section: Discussionmentioning

confidence: 99%

Detectability of Late-time Supernova Neutrinos with Fallback Accretion onto Protoneutron Star

Akaho,

Nagakura,

Foglizzo

2024

ApJ

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We investigate the late-time neutrino emission powered by fallback mass accretion onto a protoneutron star (PNS), using neutrino radiation-hydrodynamic simulations with full Boltzmann neutrino transport. We follow the time evolution of the accretion flow onto the PNS until the system reaches a quasi-steady state. A standing shock wave is commonly formed in the accretion flow, whereas the shock radius varies depending on the mass accretion rate and the PNS mass. A sharp increase in temperature emerges in the vicinity of the PNS (∼10 km), which characterizes neutrino emission. Both the neutrino luminosity and the average energy become higher with increasing mass accretion rate and PNS mass. The mean energy of the emitted neutrinos is in the range of 10 ≲ ϵ ≲ 20 MeV, which is higher than that estimated from PNS cooling models (≲10 MeV). Assuming a distance to core-collapse supernova of 10 kpc, we quantify neutrino event rates for Super-Kamiokande (Super-K) and Deep Underground Neutrino Experiment (DUNE). The estimated detection rates are well above the background, and their energy-dependent features are qualitatively different from those expected from PNS cooling models. Another notable feature is that the neutrino emission is strongly flavor dependent, exhibiting that the neutrino event rate hinges on the neutrino oscillation model. We estimate them in the case with the adiabatic Mikheev–Smirnov–Wolfenstein model, and show that the normal and inverted mass hierarchy offer a large number of neutrino detections in Super-K and DUNE, respectively. Hence the simultaneous observation with Super-K and DUNE of fallback neutrinos will provide a strong constraint on the neutrino mass hierarchy.

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Section: Discussionmentioning

confidence: 99%

Detectability of Late-time Supernova Neutrinos with Fallback Accretion onto Protoneutron Star

Akaho,

Nagakura,

Foglizzo

2024

ApJ

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Simple fits for the neutrino luminosities from protoneutron star cooling

Lucente,

Heinlein,

Janka

et al. 2024

Phys. Rev. D

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Impacts of Black-hole-forming Supernova Explosions on the Diffuse Neutrino Background

Nakazato,

Akaho,

Ashida

et al. 2024

ApJ

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The flux spectrum, event rate, and experimental sensitivity are investigated for the diffuse supernova (SN) neutrino background (DSNB), which originates from past stellar collapses and is also known as a supernova relic neutrino background. For this purpose, the contribution of collapses that lead to successful supernova explosion and black hole (BH) formation simultaneously, which are suggested to be a nonnegligible population from the perspective of Galactic chemical evolution, is taken into account. If the BH-forming SNe involve matter fallback onto the protoneutron star for the long term, their total emitted neutrino energy becomes much larger than that of ordinary SNe and failed SNe (BH formation without explosion). Then, in the case of the normal mass hierarchy in neutrino oscillations and with half of all core-collapse SNe being BH-forming SNe, the expected event rate according to the current DSNB model is enhanced by up to a factor of 2 due to the BH-forming SNe. While substantial uncertainties exist regarding the duration of the matter fallback, which determines the total amount of emitted neutrinos, and the fraction of BH-forming SNe, the operation time required to detect the DSNB at Hyper-Kamiokande would be reduced by such contribution in any case.

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Observing Supernova Neutrino Light Curves with Super-Kamiokande. IV. Development of SPECIAL BLEND: A New Public Analysis Code for Supernova Neutrinos

Cited by 3 publications

References 44 publications

Detectability of Late-time Supernova Neutrinos with Fallback Accretion onto Protoneutron Star

Detectability of Late-time Supernova Neutrinos with Fallback Accretion onto Protoneutron Star

Simple fits for the neutrino luminosities from protoneutron star cooling

Impacts of Black-hole-forming Supernova Explosions on the Diffuse Neutrino Background

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