DYNAMICAL BAR-MODE INSTABILITY IN DIFFERENTIALLY ROTATING MAGNETIZED NEUTRON STARS
- Department of Physics and Astronomy, Washburn University, Topeka, KS 66621 (United States)
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA 94550 (United States)
- Department of Physics and Astronomy, College of Charleston, Charleston, SC 29424 (United States)
- Departamento de AstronomIa y AstrofIsica, Universidad de Valencia, Dr. Moliner 50, 46100, Burjassot, Valencia (Spain)
This paper presents a numerical study over a wide parameter space of the likelihood of dynamical bar-mode instability in differentially rotating magnetized neutron stars. The innovative aspect of this study is the incorporation of magnetic fields in such a context, which have thus far been neglected in the purely hydrodynamical simulations available in the literature. The investigation uses the Cosmos++ code which allows us to perform three-dimensional simulations on a cylindrical grid at high resolution. A sample of Newtonian magnetohydrodynamical simulations starting from a set of models previously analyzed by other authors without magnetic fields has been performed, providing estimates of the effects of magnetic fields on the dynamical bar-mode deformation of rotating neutron stars. Overall, our results suggest that the effect of magnetic fields is not likely to be very significant in realistic configurations. Only in the most extreme cases are the magnetic fields able to suppress growth of the bar mode.
- OSTI ID:
- 21392523
- Journal Information:
- Astrophysical Journal, Vol. 707, Issue 2; Other Information: DOI: 10.1088/0004-637X/707/2/1610; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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