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Magnetars

    Principal Investigators: Kostas Kokkotas, Ralph Neuhaeuser

Magnetars are neutron stars with a magnetic field greatly exceeding B > 10^14 G. Sporadic "giant flares" are believed to be associated with starquakes caused by the rearrangement of the huge magnetic field. During these giant flares huge amounts of energy are released in only a few seconds (gamma and x-rays) and in addition, it is expected that gravitational waves should be generated. The plan is to simulate the magnetar dynamics in order to reveal the actual strength of the emitted gravitational waves, while in addition a Bayesian approach will be used for the detection of as yet unnoticed high frequency oscillations of magnetars.

Researchers

Publications

[1] Stratification, superfluidity and magnetar QPOs
A. Passamonti, S. K. Lander, arXiv:1210.2969 (MNRAS submitted)

[2] Motion of charged particles and quasinormal modes around the magnetically and tidally deformed black hole
R. A. Konoplya, Yu-Chun Liu, arXiv:1205.5311v1

[3] Are there any stable magnetic fields in barotropic stars?
S. K. Lander, D. I. Jones, arXiv:1202.2339 (MNRAS submitted)

[4] Coupled polar-axial magnetar oscillations
A. Colaiuda, K.D. Kokkotas, MNRAS in press

[5] Hydromagnetic equilibrium in non-barotropic multifluid neutron stars
K. Glampedakis, N. Andersson, S.K. Lander, MNRAS 2012, 420, 1263

[6] Magnetic neutron star equilibria with stratification and type-II superconductivity
S.K.Lander, N. Andersson, K. Glampedakis, MNRAS 2012, 419, 732

[7] Are gravitational waves from giant magnetar flares observable?
B. Zink, P.D. Lasky, K.D. Kokkotas, Phys. Rev. D 2012, 85, 024030

[8] Gravitational Waves and Hydromagnetic Instabilities in Rotating Magnetized Neutron Stars
P. Lasky, B. Zink, K.D. Kokkotas, Phys. Rev. D (2012)

[9] Magnetars oscillations in the presence of a crust
A. Colaiuda, K.D. Kokkotas, MNRAS 2011, 414, 3014

[10] Magnetohydrodynamics of superfluid and superconducting neutron star cores
K. Glampedakis, N. Andersson, L. Samuelsson, MNRAS 2011, 410, 805

[11] Ambipolar diffusion in superfluid neutron stars
K. Glampedakis, D.I. Jones, L. Samuelsson, MNRAS 2011, 413, 2021

[12] Magneto-rotational neutron star evolution: the role of core vortex pinning
K. Glampedakis, N. Andersson, ApJ 2011, 740, 35

[13] Bayesian timing analysis of giant flare of SGR 1806-20 by RXTE PCA
V. V. Hambaryan, R. Neuhaeuser, K. D. Kokkotas, Astronomy and Astrophysics 528, 45

[14] Hydromagnetic instabilities in relativistic neutron stars
P.D. Lasky, B. Zink, K.D. Kokkotas, K. Glampedakis, ApJ 2011, 735, 20L

[15] HORIZON: Accelerated General Relativistic Magnetohydrodynamics
B. Zink, arXiv:1102.5202

Theses

[16] Magnetized Neutron Stars
A. Colaiuda, PhDThesis, Eberhard-Karls-University of Tübingen (2011)

[17] Particle Motion around Black Holes immersed in a Magnetic Field
Liu, Yu-Chun, Diploma Thesis, Master Thesis, Eberhard-Karls-University of Tübingen (2011)