Maximum mass and universal relations of rotating relativistic hybrid hadron-quark stars
AffiliationUniv Arizona, Dept Astron
Univ Arizona, Dept Phys
MetadataShow full item record
CitationBozzola, G., Espino, P.L., Lewin, C.D. et al. Eur. Phys. J. A (2019) 55: 149. https://doi.org/10.1140/epja/i2019-12831-2
JournalEUROPEAN PHYSICAL JOURNAL A
Rights© Società Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature 2019
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractWe construct equilibrium models of uniformly and differentially rotating hybrid hadron-quark stars using equations of state (EOSs) with a first-order phase transition that gives rise to a third family of compact objects. We find that the ratio of the maximum possible mass of uniformly rotating configurations --the supramassive limit-- to the Tolman-Oppenheimer-Volkoff (TOV) limit mass is not EOS-independent, and is between 1.15 and 1.31, in contrast with the value of 1.20 previously found for hadronic EOSs. Therefore, some of the constraints placed on the EOS from the observation of the gravitational wave event GW170817 do not apply to hadron-quark EOSs. However, the supramassive limit mass for the family of EOSs we treat is consistent with limits set by GW170817, strengthening the possibility of interpreting GW170817 with a hybrid hadron-quark EOS. We also find that along constant angular momentum sequences of uniformly rotating stars, the third family maximum and minimum mass models satisfy approximate EOS-independent relations, and the supramassive limit of the third family is approximately 16.5% larger than the third family TOV limit. For differentially rotating spheroidal stars, we find that a lower-limit on the maximum supportable rest mass is 123% more than the TOV limit rest mass. Finally, we verify that the recently discovered universal relations relating angular momentum, rest mass and gravitational mass for turning-point models hold for hybrid hadron-quark EOSs when uniform rotation is considered, but have a clear dependence on the degree of differential rotation.
Note12 month embargo; first online 16 September 2019
VersionFinal accepted manuscript
SponsorsNational Science Foundation at The University of Arizona [PHY-1912619]; National Science FoundationNational Science Foundation (NSF); U.S. Department of Energy's Office of ScienceUnited States Department of Energy (DOE)