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タイトル: | Simulations of Core-collapse Supernovae in Spatial Axisymmetry with Full Boltzmann Neutrino Transport |
著者: | Nagakura, Hiroki Iwakami, Wakana Furusawa, Shun Okawa, Hirotada Harada, Akira Sumiyoshi, Kohsuke Yamada, Shoichi Matsufuru, Hideo Imakura, Akira |
著者名の別形: | 岩上, わかな |
キーワード: | hydrodynamics neutrinos supernovae: general |
発行日: | 20-Feb-2018 |
出版者: | American Astronomical Society |
誌名: | The Astrophysical Journal |
巻: | 854 |
号: | 2 |
論文番号: | 136 |
抄録: | We present the first results of our spatially axisymmetric core-collapse supernova simulations with full Boltzmann neutrino transport, which amount to a time-dependent five-dimensional (two in space and three in momentum space) problem. Special relativistic effects are fully taken into account with a two-energy-grid technique. We performed two simulations for a progenitor of 11.2 M ☉, employing different nuclear equations of state (EOSs): Lattimer and Swesty's EOS with the incompressibility of K = 220 MeV (LS EOS) and Furusawa's EOS based on the relativistic mean field theory with the TM1 parameter set (FS EOS). In the LS EOS, the shock wave reaches ~700 km at 300 ms after bounce and is still expanding, whereas in the FS EOS it stalled at ~200 km and has started to recede by the same time. This seems to be due to more vigorous turbulent motions in the former during the entire postbounce phase, which leads to higher neutrino-heating efficiency in the neutrino-driven convection. We also look into the neutrino distributions in momentum space, which is the advantage of the Boltzmann transport over other approximate methods. We find nonaxisymmetric angular distributions with respect to the local radial direction, which also generate off-diagonal components of the Eddington tensor. We find that the rθ component reaches ~10% of the dominant rr component and, more importantly, it dictates the evolution of lateral neutrino fluxes, dominating over the θθ component, in the semitransparent region. These data will be useful to further test and possibly improve the prescriptions used in the approximate methods. |
著作権等: | Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
URI: | http://hdl.handle.net/2433/231099 |
DOI(出版社版): | 10.3847/1538-4357/aaac29 |
出現コレクション: | 学術雑誌掲載論文等 |
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