Mass-Radius Relation of Strongly Magnetized White Dwarfs: Dependence on Field Geometry, GR effects and Electrostatic Corrections to the EOS

Abstract

Recent literature has seen an ongoing discussion on the limiting mass of strongly magnetized white dwarfs, since such objects may prove to be a source of over-luminous type-Ia supernovae. In an earlier paper, we have presented the mass-radius relation of white dwarfs with a strong poloidal magnetic field in Newtonian gravity. The inclusion of effects such as general relativistic gravity and many-body corrections to the equation of state can alter the mass-radius relation and the maximum mass. In this work we estimate the extent to which these effects may modify the earlier results. We find that the general relativistic effects tend to reduce the maximum mass by about 2% and many-body corrections by another additional $\sim$2%, for an assumed carbon composition. We also explore field geometries that are purely toroidal or a mixture of poloidal and toroidal and find that the limiting mass of such equilibrium configurations can be substantially higher than in the case of a purely poloidal field.

12 pages, 7 figures, submitted to MNRAS

References in corpus (39)

• The type Ia supernova SNLS-03D3bb from a super-Chandrasekhar-mass white dwarf star
• Nearby Supernova Factory Observations of SN 2007if: First Total Mass Measurement of a Super-Chandrasekhar-Mass Progenitor
• Stable magnetic fields in stellar interiors
• Axisymmetric magnetic fields in stars: relative strengths of poloidal and toroidal components
• The Luminous and Carbon-Rich Supernova 2006gz: A Double Degenerate Merger?
• Binary Star Origin of High Field Magnetic White Dwarfs
• Fourteen Months of Observations of the Possible Super-Chandrasekhar Mass Type Ia Supernova 2009dc
• High luminosity, slow ejecta and persistent carbon lines: SN 2009dc challenges thermonuclear explosion scenarios
• Equilibrium models of relativistic stars with a toroidal magnetic field
• Magnetic fields in axisymmetric neutron stars
• Early phase observations of extremely luminous Type Ia Supernova 2009dc
• Twisted-torus configurations with large toroidal magnetic fields in relativistic stars
• Axisymmetric equilibrium models for magnetized neutron stars in General Relativity under the Conformally Flat Condition
• Magneto-elastic oscillations of neutron stars with dipolar magnetic fields
• On the universality of I-Love-Q relations in magnetized neutron stars
• The Most Magnetic Stars
• GRMHD in axisymmetric dynamical spacetimes: the X-ECHO code
• Strongly magnetized cold electron degenerate gas: Mass-radius relation of the magnetized white dwarf
• Spectropolarimetry of Extremely Luminous Type Ia Supernova 2009dc: Nearly Spherical Explosion of Super-Chandrasekhar Mass White Dwarf
• On general relativistic uniformly rotating white dwarfs
• Relativistic stars with purely toroidal magnetic fields
• The relativistic Feynman-Metropolis-Teller theory for white-dwarfs in general relativity
• Magneto-elastic oscillations of neutron stars: exploring different magnetic field configurations
• Effects of strong magnetic fields and rotation on white dwarf structure
• General relativistic neutron stars with twisted magnetosphere
• Stability of super-Chandrasekhar magnetic white dwarfs
• Instability of Magnetic Equilibria in Barotropic Stars
• GRMHD formulation of highly super-Chandrasekhar rotating magnetised white dwarfs: Stable configurations of non-spherical white dwarfs
• The role of currents distribution in general relativistic equilibria of magnetized neutron stars
• Evolutions of Magnetized and Rotating Neutron Stars
• Dynamical instability of white dwarfs and breaking of spherical symmetry under the presence of extreme magnetic fields
• On magnetic equilibria in barotropic stars
• Mass-radius relation of strongly magnetized white dwarfs: nearly independent of Landau quantization
• Maximum mass of magnetic white dwarfs
• Strong constraints on magnetized white dwarfs surpassing the Chandrasekhar mass limit
• Consequence of total lepton number violation in strongly magnetized iron white dwarfs
• Revised density of magnetized nuclear matter at the neutron drip line
• Appearance of the prolate and the toroidal magnetic field dominated stars - Analytic approach
• Landau quantization and mass-radius relation of magnetized White Dwarfs in general relativity

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• Timescales for detection of super-Chandrasekhar white dwarfs by gravitational wave astronomy
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• Structure and evolution of ultra-massive white dwarfs in general relativity
• General Relativistic Calculations for White Dwarf Stars
• Study of the charged super-Chandrasekhar limiting mass white dwarfs in the $f(R,\mathcal{T})$ gravity
• White dwarfs with a surface electrical charge distribution: Equilibrium and stability
• AR Sco as a possible seed of highly magnetised white dwarf
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• Accretion-induced Collapse of Dark Matter-admixed Rotating White Dwarfs: Dynamics and Gravitational-wave Signals
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