http://arxiv.org/abs/2102.09686
Six binary-merger progenitors of Supernova 1987A (SN 1987A), whose properties are close to those of the blue supergiant Sanduleak -69 202, are exploded by neutrino heating in three-dimensions (3D), and light-curve calculations are performed in spherical symmetry, starting long after shock breakout. Our results confirm basic findings of previous works using single-star progenitors: (1) 3D neutrino-driven explosions with SN 1987A-like energies synthesize an amount of Ni-56 that is consistent with the radioactive tail of the light curve; (2) hydrodynamic models mix hydrogen inward to minimum velocities below 40 km/s as required by spectral observations of SN 1987A; and (3) for given explosion energy the efficiency of outward radioactive Ni-56 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 consistent with 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 about 7 days. The light curve shape of models that mix about 0.5 Msun of hydrogen into the helium shell and that exhibit strong outward mixing of Ni-56 with maximum velocities exceeding the 3000 km/s observed for the bulk of ejected Ni-56 is in very good agreement with the dome of the SN 1987A light curve. A comparative analysis of light-curve models of SN 1987A based on 3D neutrino-driven explosions of single-star and binary-merger progenitors shows that only one binary model matches all observational constraints with one exception.
V. Utrobin, A. Wongwathanarat, H. Janka, et. al.
Mon, 22 Feb 21
36/51
Comments: 31 pages, 14 figures, 6 tables. Submitted for publication in ApJ