QUARK MATTER IN MASSIVE COMPACT STARS

Journal Article · Mon Oct 10 04:00:00 EDT 2011 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/740/1/L14· OSTI ID:21565399

Weissenborn, Simon; Pagliara, Giuseppe; Schaffner-Bielich, Juergen ^[1]; Sagert, Irina ^[2]; Hempel, Matthias ^[3]

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1. Institute for Theoretical Physics, Ruprecht-Karls University, 69120 Heidelberg (Germany)
2. Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824 (United States)
3. Department of Physics, University of Basel, 4056 Basel (Switzerland)

The recent observation of the pulsar PSR J1614-2230 with a mass of 1.97 {+-} 0.04 M{sub sun} gives a strong constraint on the quark and nuclear matter equations of state (EoS). We explore the parameter ranges for a parameterized EoS for quark stars. We find that strange stars, made of absolutely stable strange quark matter, comply with the new constraint only if effects from the strong coupling constant and color-superconductivity are taken into account. Hybrid stars, compact stars with a quark matter core and a hadronic outer layer, can be as massive as 2 M{sub sun}, but only for a significantly limited range of parameters. We demonstrate that the appearance of quark matter in massive stars crucially depends on the stiffness of the nuclear matter EoS. We show that the masses of hybrid stars stay below the ones of hadronic and pure quark stars, due to the softening of the EoS at the quark-hadron phase transition.

• OSTI ID: 21565399
• Journal Information: Astrophysical Journal Letters, Journal Name: Astrophysical Journal Letters Journal Issue: 1 Vol. 740; ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
COSMIC RADIO SOURCES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTARY PARTICLES
EQUATIONS
EQUATIONS OF STATE
FERMIONS
MATHEMATICAL MODELS
MATTER
NUCLEAR MATTER
PARTICLE MODELS
PHYSICAL PROPERTIES
PULSARS
QUARK MATTER
QUARKS
S QUARKS
STARS
STRANGE PARTICLES
STRONG-COUPLING MODEL
SUPERCONDUCTIVITY