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Supernova 1987A: 3D Mixing and light curves for explosion models based on binary-merger progenitors

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Utrobin,  V. P.
Stellar Astrophysics, MPI for Astrophysics, Max Planck Society;

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Wongwathanarat,  A.
Stellar Astrophysics, MPI for Astrophysics, Max Planck Society;

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Janka,  H. Th.
Stellar Astrophysics, MPI for Astrophysics, Max Planck Society;

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Müller,  E.
Stellar Astrophysics, MPI for Astrophysics, Max Planck Society;

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Ertl,  T.
Stellar Astrophysics, MPI for Astrophysics, Max Planck Society;

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Citation

Utrobin, V. P., Wongwathanarat, A., Janka, H. T., Müller, E., Ertl, T., Menon, A., et al. (2021). Supernova 1987A: 3D Mixing and light curves for explosion models based on binary-merger progenitors. The Astrophysical Journal, 914(1): 4. doi:10.3847/1538-4357/abf4c5.


Cite as: http://hdl.handle.net/21.11116/0000-0008-F585-D
Abstract
Six binary-merger progenitors of supernova 1987A (SN 1987A) with properties close to those of the blue supergiant Sanduleak −69°202 are exploded by neutrino heating and evolved until long after shock breakout in 3D and continued for light-curve calculations in spherical symmetry. Our results confirm previous findings for single-star progenitors: (1) 3D neutrino-driven explosions with SN 1987A-like energies synthesize 56Ni masses consistent with the radioactive light-curve tail; (2) hydrodynamic models mix hydrogen inward to minimum velocities below 40 km s−1 compatible with spectral observations of SN 1987A; and (3) for given explosion energy the efficiency of outward radioactive 56Ni mixing depends mainly on high growth factors of Rayleigh–Taylor instabilities at the (C+O)/He and He/H composition interfaces and a weak interaction of fast plumes with the reverse shock occurring below the He/H interface. All binary-merger models possess presupernova radii matching the photometric radius of Sanduleak −69°202 and a structure of the outer layers allowing them to reproduce the observed initial luminosity peak in the first ~7 days. Models that mix about 0.5 M of hydrogen into the He-shell and exhibit strong outward mixing of 56Ni with maximum velocities exceeding the 3000 km s−1 observed for the bulk of ejected 56Ni have light-curve shapes in good agreement with the dome of the SN 1987A light curve. A comparative analysis of the best representatives of our 3D neutrino-driven explosion models of SN 1987A based on single-star and binary-merger progenitors reveals that only one binary model fulfills all observational constraints, except one.