A new view on the maximum mass of differentially rotating neutron stars
| Autor: | Marcus Ansorg, Dorota Gondek-Rosińska, Marcin Kucaba, Loïc Villain, I. Kowalska |
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| Přispěvatelé: | Laboratoire de Mathématiques et Physique Théorique (LMPT), Université de Tours-Centre National de la Recherche Scientifique (CNRS), Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mathématiques et Physique Théorique ( LMPT ), Université de Tours-Centre National de la Recherche Scientifique ( CNRS ), Centre National de la Recherche Scientifique (CNRS)-Université de Tours |
| Rok vydání: | 2016 |
| Předmět: |
[ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph]
FOS: Physical sciences Astrophysics Rotation 01 natural sciences methods: numerical Gravitation stars: neutron stars: rotation 0103 physical sciences Differential rotation 010303 astronomy & astrophysics Stellar density Physics High Energy Astrophysical Phenomena (astro-ph.HE) 010308 nuclear & particles physics Equation of state (cosmology) Gravitational wave Astronomy and Astrophysics Stars Neutron star gravitational waves Space and Planetary Science gravitation Astrophysics - High Energy Astrophysical Phenomena [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
| Zdroj: | Astrophys.J. Astrophys.J., 2017, 837 (1), pp.58. ⟨10.3847/1538-4357/aa56c1⟩ Astrophys.J., 2017, 837 (1), pp.58. 〈10.3847/1538-4357/aa56c1〉 |
| DOI: | 10.48550/arxiv.1609.02336 |
| Popis: | We study the main astrophysical properties of differentially rotating neutron stars described as stationary and axisymmetric configurations of a moderately stiff $\Gamma=2$ polytropic fluid. The high level of accuracy and of stability of our relativistic multidomain pseudo-spectral code enables us to explore the whole solution space for broad ranges of the degree of differential rotation, but also of the stellar density and oblateness. Staying within an astrophysicaly motivated range of rotation profiles, we investigate the characteristics of neutron stars with maximal mass for all types of families of differentially rotating relativistic objects identified in a previous article Ansorg, Gondek-Rosinsla, Villain (2009). We find that the maximum mass depends on both the degree of differential rotation and on the type of solution. It turns out that the maximum allowed mass can be up to 4 times higher than what it is for non-rotating stars with the same equation of state. Such values are obtained for a modest degree of differential rotation but for one of the newly discovered type of solutions. Since such configurations of stars are not that extreme, this result may have important consequences for the gravitational wave signal to expect from coalescing neutron star binaries or from some supernovae events. Comment: 15 pages, 17 fiigures, submitted to the Astrophysical Journal |
| Databáze: | OpenAIRE |
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