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  Effects of LESA in three-dimensional supernova simulations with multidimensional and ray-by-ray-plus neutrino transport

Glas, R., Janka, H.-T., Melson, T., Stockinger, G., & Just, O. (2019). Effects of LESA in three-dimensional supernova simulations with multidimensional and ray-by-ray-plus neutrino transport. The Astrophysical Journal, 881(1): 36. doi:10.3847/1538-4357/ab275c.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-A0F4-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-A0F5-2
Genre: Journal Article

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Glas, Robert1, Author              
Janka, H.-Thomas1, Author              
Melson, Tobias1, Author              
Stockinger, G.1, Author              
Just, Oliver1, Author              
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1Stellar Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159882              

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 Abstract: A set of eight self-consistent, time-dependent supernova (SN) simulations in three spatial dimensions (3D) for 9 and 20 M progenitors is evaluated for the presence of dipolar asymmetries of the electron lepton-number emission as discovered by Tamborra et al. and termed lepton-number emission self-sustained asymmetry (LESA). The simulations were performed with the Aenus–Alcar neutrino/hydrodynamics code, which treats the energy- and velocity-dependent transport of neutrinos of all flavors by a two-moment scheme with algebraic M1 closure. For each of the progenitors, results with fully multidimensional (FMD) neutrino transport and with ray-by-ray-plus (RbR+) approximation are considered for two different grid resolutions. While the 9 M models develop explosions, the 20 M progenitor does not explode with the employed version of simplified neutrino opacities. In all 3D models we observe the growth of substantial dipole amplitudes of the lepton-number (electron neutrino minus antineutrino) flux with stable or slowly time-evolving direction and overall properties fully consistent with the LESA phenomenon. Models with RbR+ transport develop LESA dipoles somewhat faster and with temporarily higher amplitudes, but the FMD calculations exhibit cleaner hemispheric asymmetries with a far more dominant dipole. In contrast, the RbR+ results display much wider multipole spectra of the neutrino emission anisotropies with significant power also in the quadrupole and higher-order modes. Our results disprove speculations that LESA is a numerical artifact of RbR+ transport. We also discuss LESA as a consequence of a dipolar convection flow inside of the nascent neutron star and establish, tentatively, a connection to Chandrasekhar's linear theory of thermal instability in spherical shells.

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 Dates: 2019-08-09
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ab275c
Other: LOCALID: 3161792
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 881 (1) Sequence Number: 36 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3