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- 저자 : Kei Kotake (검색결과 2 건)
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Neutrino burst and gravitational wave from supernova explosions
Katsuhiko Sato,Kei Kotake,Keitaro Takahashi,Shin'ichiro Ando 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
The time prole and energy spectrum of a neutrino burst from supernovae is greatly modied by the eect of neutrino oscillations. We review how these conversions happen in a supernova mantle and how the burst could be detected by SK (Super-Kamiokande) and SNO (Sudbury Neutrino Observatory). We show that implications for neutrino parameters (mass hierarchy and the mixing angle between mass eigenstate 1; 3), can be obtained if a supernova appears at the Galactic Center. We also discuss the eects of neutrino oscillation on the supernova relic neutrino observations. In the end, we discuss the gravitational radiation from the rotating stellar cores, which will give us the information of the angular momentum distribution for evolved massive stars.
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THREE-DIMENSIONAL SIMULATION OF A ROTATING CORE-COLLAPSE SUPERNOVA
NAKAMURA, KO,KURODA, TAKAMI,TAKIWAKI, TOMOYA,KOTAKE, KEI The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
Multi-dimensionality in the inner working of core-collapse supernovae has long been considered one of the most important ingredients to understand the explosion mechanism. We perform a series of numerical experiments to explore how rotation impacts the 3-dimensional hydrodynamics of core-collapse supernova. We employ a light-bulb scheme to trigger explosions and a three-species neutrino leakage scheme to treat deleptonization effects and neutrino losses from the neutron star interior. We find that the rotation can help the onset of neutrino-driven explosions for models in which the initial angular momentum is matched to that obtained from recent stellar evolutionary calculations (${\sim}0.3-3rad\;s^{-1}$ at the center). For models with larger initial angular momenta, a shock surface deforms to be oblate due to larger centrifugal force. This makes a gain region, in which matter gains energy from neutrinos, more concentrated around the equatorial plane. As a result, the preferred direction of the explosion in 3-dimensional rotating models is perpendicular to the spin axis, which is in sharp contrast to the polar explosions around the axis that are often obtained from 2-dimensional simulations.
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