2022/02/24 by Mauro Mariani, Lucas Tonetto, M. Camila Rodríguez +6 · 20 citations
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics #Equation of state #Gamma-ray bursts and supernovae #High-pressure geophysics and materials #Magnetar #Magnetic field #Neutron star #Physics #Pulsars and Gravitational Waves Research #Quantum mechanics #Stars #astro-ph.HE #nucl-th
paper · pdf · open access · doi:10.1093/mnras/stac546
published in Monthly Notices of the Royal Astronomical Society 512(1), 517-534 (Oxford University Press) · Accepted for publication in MNRAS (February 2022)
arxiv created 2022/02/24 · openalex publication_date 2022/02/25 · arxiv updated 2022/03/01 · openalex created_date 2022/03/02 · openalex updated_date 2026/08/06
We model neutron stars as magnetised hybrid stars with an abrupt hadron-quark phase transition in their cores, taking into account current constraints from nuclear experiments and multi-messenger observations. We include magnetic field effects considering the Landau level quantisation of charged particles and the anomalous magnetic moment of neutral particles. We construct the magnetised hybrid equation of state, and we compute the particle population, the matter magnetisation and the transverse and parallel pressure components. We integrate the stable stellar models, considering the dynamical stability for rapid or slow hadron-quark phase conversion. Finally, we calculate the frequencies and damping times of the fundamental and g non-radial oscillation modes. The latter, a key mode to learn about phase transitions in compact objects, is only obtained for stars with slow conversions. For low magnetic fields, we find that one of the objects of the GW170817 binary system might be a hybrid star belonging to the slow extended stability branch. For magnetars, we find that a stronger magnetic field always softens the hadronic equation of state. Besides, only for some parameter combinations a stronger magnetic field implies a higher hybrid star maximum mass. Contrary to previous results, the incorporation of anomalous magnetic moment does not affect the studied astrophysical quantities. We discuss possible imprints of the microphysics of the equation of state that could be tested observationally in the future, and that might help infer the nature of dense matter and hybrid stars.