Details

Autor(en) / Beteiligte

• Fischer, T
• Sagert, I
• Pagliara, G
• Hempel, M
• Schaffner-Bielich, J
• Rauscher, T
• Thielemann, F.-K
• Käppeli, R
• Martínez-Pinedo, G
• Liebendörfer, M

Titel

Core-collapse Supernova Explosions Triggered by a Quark-Hadron Phase Transition During the Early Post-bounce Phase

Ist Teil von

• The Astrophysical journal. Supplement series, 2011-06, Vol.194 (2), p.39-jQuery1323920011739='48'

Ort / Verlag

United States: IOP Publishing

Erscheinungsjahr

2011

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• We explore explosions of massive stars, which are triggered via the quark-hadron phase transition during the early post-bounce phase of core-collapse supernovae. We construct a quark equation of state, based on the bag model for strange quark matter. The transition between the hadronic and the quark phases is constructed applying Gibbs conditions. The resulting quark-hadron hybrid equations of state are used in core-collapse supernova simulations, based on general relativistic radiation hydrodynamics and three-flavor Boltzmann neutrino transport in spherical symmetry. The formation of a mixed phase reduces the adiabatic index, which induces the gravitational collapse of the central protoneutron star (PNS). The collapse halts in the pure quark phase, where the adiabatic index increases. A strong accretion shock forms, which propagates toward the PNS surface. Due to the density decrease of several orders of magnitude, the accretion shock turns into a dynamic shock with matter outflow. This moment defines the onset of the explosion in supernova models that allow for a quark-hadron phase transition, where otherwise no explosions could be obtained. The shock propagation across the neutrinospheres releases a burst of neutrinos. This serves as a strong observable identification for the structural reconfiguration of the stellar core. The ejected matter expands on a short timescale and remains neutron-rich. These conditions might be suitable for the production of heavy elements via the r-process. The neutron-rich material is followed by proton-rich neutrino-driven ejecta in the later cooling phase of the PNS where the Delta *np-process might occur.