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• W3101407641 endingPage "13" @default.
• W3101407641 startingPage "13" @default.
• W3101407641 abstract "The spatial and velocity distributions of nuclear species synthesized in the innermost regions of core-collapse supernovae can yield important clues about explosion asymmetries and the operation of the still disputed explosion mechanism. Recent observations of radioactive 44Ti with high-energy satellite telescopes (Nuclear Spectroscopic Telescope Array [NuSTAR], INTEGRAL) have measured gamma-ray line details, which provide direct evidence of large-scale explosion asymmetries in SN 1987A and in Cassiopeia A (Cas A) even by mapping of the spatial brightness distribution (NuSTAR). Here we discuss a 3D simulation of a neutrino-driven explosion, using a parameterized neutrino engine, whose 44Ti distribution is mostly concentrated in one hemisphere pointing opposite to the neutron star (NS) kick velocity. Both exhibit intriguing resemblance to the observed morphology of the Cas A remnant, although neither the progenitor nor the explosion was fine-tuned for a perfect match. Our results demonstrate that the asymmetries observed in this remnant can, in principle, be accounted for by a neutrino-driven explosion, and that the high 44Ti abundance in Cas A may be explained without invoking rapid rotation or a jet-driven explosion, because neutrino-driven explosions generically eject large amounts of high-entropy matter. The recoil acceleration of the NS is connected to mass ejection asymmetries and is opposite to the direction of the stronger explosion, fully compatible with the gravitational tugboat mechanism. Our results also imply that Cas A and SN 1987A could possess similarly one-sided Ti and Fe asymmetries, with the difference that Cas A is viewed from a direction with large inclination angle to the NS motion, whereas the NS in SN 1987A should have a dominant velocity component pointing toward us." @default.
• W3101407641 created "2020-11-23" @default.
• W3101407641 creator A5008257129 @default.
• W3101407641 creator A5009164035 @default.
• W3101407641 creator A5009905924 @default.
• W3101407641 creator A5056149980 @default.
• W3101407641 creator A5061996870 @default.
• W3101407641 date "2017-06-07" @default.
• W3101407641 modified "2023-10-18" @default.
• W3101407641 title "Production and Distribution of⁴⁴Ti and⁵⁶Ni in a Three-dimensional Supernova Model Resembling Cassiopeia A" @default.
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