Towards generating a new supernova equation of state: A systematic analysis of cold hybrid stars

Heinimann, Oliver and Hempel, Matthias and Thielemann, Friedrich-Karl. (2016) Towards generating a new supernova equation of state: A systematic analysis of cold hybrid stars. Physical Review D - Particles, Fields, Gravitation and Cosmology , 94 (10). p. 103008.

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Official URL: http://edoc.unibas.ch/53851/

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The hadron-quark phase transition in core-collapse supernovae (CCSNe) has the potential to trigger explosions in otherwise nonexploding models. However, those hybrid supernova equations of state (EOS) shown to trigger an explosion do not support the observational 2 M ⊙ 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) of c QM 2 =1 /3 . We find promising cases which meet the 2 M ⊙ 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 with c QM 2 =1 /3 can increase the maximum mass only if reconfinement is suppressed or if quark matter is absolutely stable.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Thielemann, Friedrich-Karl and Hempel, Matthias and Heinimann, Oliver Philipp
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:20 Feb 2017 09:56
Deposited On:20 Feb 2017 09:56

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