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Strong constraints on magnetized white dwarfs surpassing the Chandrasekhar mass limit
Phys. Rev. D 89, 103017 – Published 30 May, 2014Erratum Phys. Rev. D 91, 029904 (2015)
DOI: https://doi.org/10.1103/PhysRevD.89.103017
Abstract
We show that recently proposed white dwarf models with masses well in excess of the Chandrasekhar limit, based on modifying the equation of state by a superstrong magnetic field in the center, are very far from equilibrium because of the neglect of Lorentz forces. An upper bound on the central magnetic fields, from a spherically averaged hydrostatic equation, is much smaller than the values assumed. Robust estimates of the Lorentz forces are also made without assuming spherical averaging. These again bear out the results obtained from a spherically averaged model. In our assessment, these estimates rule out the possibility that magnetic tension could change the situation in favor of larger magnetic fields. We conclude that such super-Chandrasekhar models are unphysical, and exploration of their astrophysical consequences is premature.
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References (13)
- U. Das and B. Mukhopadhyay, Phys. Rev. D 86, 042001 (2012).
- U. Das and B. Mukhopadhyay, Int. J. Mod. Phys. D 21, 1242001 (2012).
- U. Das and B. Mukhopadhyay, Phys. Rev. Lett. 110, 071102 (2013).
- U. Das, B. Mukhopadhyay, and A. R. Rao, Astrophys. J. 767, L14 (2013).
- R. Nityananda and S. Konar, arXiv:1405.4719.
- U. Das and B. Mukhopadhyay, Mod. Phys. Lett. A 29, 1450035 (2014).
- S. Chandrasekhar, Hydrodynamic and Hydromagnetic Stability (Dover Publications, New York, 1981).
- S. Chandrasekhar, An Introduction to the Study of Stellar Structure (University of Chicago Press, New York, 1939).
- D. D. Clayton, Principles of Stellar Evolution and Nucleosynthesis (McGraw-Hill, New York, 1968).
- D. Lai and S. L. Shapiro, Astrophys. J. 383, 745 (1991).
- N. Chamel, A. F. Fantina, and P. J. Davis, Phys. Rev. D 88, 081301 (2013).
- J. G. Coelho, R. M. Marinho, Jr., M. Malheiro, R. Negreiros, D. L. Cáceres, J. A. Rueda, and R. Ruffini, arXiv:1306.4658.
- P. Bera and D. Bhattacharya, arXiv:1405.2282.