http://arxiv.org/abs/1608.08862
The hadron-quark phase transition in core-collapse supernovae (CCSNe) has the potential to trigger explosions in otherwise non-exploding models. However, those hybrid supernova equations of state (EOS) shown to trigger an explosion do not support the observational 2 M_sun neutron star maximum mass constraint. In this work, we analyze cold hybrid stars by the means of a systematic parameter scan for the phase transition properties, with the aim to develop a new hybrid supernova EOS. The hadronic phase is described with the state-of-the-art supernova EOS HS(DD2), and quark matter by an EOS with a constant speed of sound (“CSS”). We find promising cases which meet the 2 M_sun criterion and are interesting for CCSN explosions. We show that the very simple CSS EOS is transferable into the well known thermodynamic bag model, important for future application in CCSN simulations. In the second part, the occurrence of reconfinement and multiple phase transitions is discussed. In the last part, the influence of hyperons in our parameter scan is studied. Including hyperons no change in the general behavior is found, except for overall lower maximum masses. In both cases (with and without hyperons) we find that quark matter can increase the maximum mass only if reconfinement is suppressed or if quark matter is absolutely stable.
O. Heinimann, M. Hempel and F. Thielemann
Thu, 1 Sep 16
11/74
Comments: 14 pages, 11 figures
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