All Outputs (11)

Three-dimensional Modeling of the Magnetothermal Evolution of Neutron Stars: Method and Test Cases (2020)
Journal Article
Grandis, D. D., Turolla, R., Wood, T. S., Zane, S., Taverna, R., & Gourgouliatos, K. N. (2020). Three-dimensional Modeling of the Magnetothermal Evolution of Neutron Stars: Method and Test Cases. Astrophysical Journal, 903(1), Article 40. https://doi.org/10.3847/1538-4357/abb6f9

Neutron stars harbor extremely strong magnetic fields within their solid outer crust. The topology of this field strongly influences the surface temperature distribution and, hence, the star's observational properties. In this work, we present the fi... Read More about Three-dimensional Modeling of the Magnetothermal Evolution of Neutron Stars: Method and Test Cases.

Nonaxisymmetric Hall instability: A key to understanding magnetars (2019)
Journal Article
Gourgouliatos, K., & Pons, J. A. (2019). Nonaxisymmetric Hall instability: A key to understanding magnetars. Physical Review Research, 1(3), Article 032049(R). https://doi.org/10.1103/physrevresearch.1.032049

It is generally accepted that the nonlinear, dynamical evolution of magnetic fields in the interior of neutron stars plays a key role in the explanation of the observed phenomenology. Understanding the transfer of energy between toroidal and poloidal... Read More about Nonaxisymmetric Hall instability: A key to understanding magnetars.

Magnetic inhibition of centrifugal instability (2019)
Journal Article
Komissarov, S. S., Gourgouliatos, K. N., & Matsumoto, J. (2019). Magnetic inhibition of centrifugal instability. Monthly Notices of the Royal Astronomical Society, 488(3), 4061-4073. https://doi.org/10.1093/mnras/stz1973

Recently, it was shown that the centrifugal instability may be important in the dynamics of astrophysical jets undergoing reconfinement by external pressure. However, these studies were limited to the case of unmagnetized flows. Here, we explore the... Read More about Magnetic inhibition of centrifugal instability.

Current closure through the neutron star crust (2019)
Journal Article
Karageorgopoulos, V., Gourgouliatos, K., & Contopoulos, I. (2019). Current closure through the neutron star crust. Monthly Notices of the Royal Astronomical Society, 487(3), 3333-3341. https://doi.org/10.1093/mnras/stz1507

Force-free pulsar magnetospheres develop a large-scale poloidal electric current circuit that flows along open magnetic field lines from the neutron star to the termination shock. The electric current closes through the interior of the neutron star w... Read More about Current closure through the neutron star crust.

Magnetic-field evolution in a plastically failing neutron-star crust (2019)
Journal Article
Lander, S., & Gourgouliatos, K. (2019). Magnetic-field evolution in a plastically failing neutron-star crust. Monthly Notices of the Royal Astronomical Society, 486(3), 4130-4143. https://doi.org/10.1093/mnras/stz1042

Under normal conditions in a neutron-star (NS) crust, ions are locked in place in the crustal lattice and only electrons are mobile, and magnetic-field evolution is thus directly related to the electron velocity. The evolution, however, builds magnet... Read More about Magnetic-field evolution in a plastically failing neutron-star crust.

Coupled axisymmetric pulsar magnetospheres (2018)
Journal Article
Gourgouliatos, K. N., & Lynden-Bell, D. (2018). Coupled axisymmetric pulsar magnetospheres. Monthly Notices of the Royal Astronomical Society, 482(2), 1942-1954. https://doi.org/10.1093/mnras/sty2766

We present solutions of force-free pulsar magnetospheres coupled with a uniform external magnetic field aligned with the dipole magnetic moment of the pulsar. The inclusion of the uniform magnetic field has the following consequences: the equatorial... Read More about Coupled axisymmetric pulsar magnetospheres.

Relativistic Centrifugal Instability (2018)
Journal Article
Gourgouliatos, K. N., & Komissarov, S. S. (2018). Relativistic Centrifugal Instability. Monthly Notices of the Royal Astronomical Society: Letters, 475(1), L125-L129. https://doi.org/10.1093/mnrasl/sly016

Near the central engine, many astrophysical jets are expected to rotate about their axis. Further out they are expected to go through the processes of reconfinement and recollimation. In both these cases, the flow streams along a concave surface and... Read More about Relativistic Centrifugal Instability.

The Glitches and Rotational History of the Highly Energetic Young Pulsar PSR J0537–6910 (2018)
Journal Article
Ferdman, R., Archibald, R., Gourgouliatos, K., & Kaspi, V. (2018). The Glitches and Rotational History of the Highly Energetic Young Pulsar PSR J0537–6910. Astrophysical Journal, 852(2), Article 123. https://doi.org/10.3847/1538-4357/aaa198

We present a timing and glitch analysis of the young X-ray pulsar PSR J0537−6910, located within the Large Magellanic Cloud, using 13 yr of data from the now-decommissioned Rossi X-ray Timing Explorer. Rotating with a spin period of 16 ms, PSR J0537−... Read More about The Glitches and Rotational History of the Highly Energetic Young Pulsar PSR J0537–6910.

Magnetic Axis Drift and Magnetic Spot Formation in Neutron Stars with Toroidal Fields (2017)
Journal Article
Gourgouliatos, K. N., & Hollerbach, R. (2018). Magnetic Axis Drift and Magnetic Spot Formation in Neutron Stars with Toroidal Fields. Astrophysical Journal, 852(1), Article 21. https://doi.org/10.3847/1538-4357/aa9d93

We explore magnetic field configurations that lead to the formation of magnetic spots on the surface of neutron stars and the displacement of the magnetic dipole axis. We find that a toroidally dominated magnetic field is essential for the generation... Read More about Magnetic Axis Drift and Magnetic Spot Formation in Neutron Stars with Toroidal Fields.

Reconfinement and loss of stability in jets from active galactic nuclei (2017)
Journal Article
Gourgouliatos, K. N., & Komissarov, S. S. (2018). Reconfinement and loss of stability in jets from active galactic nuclei. Nature Astronomy, 2(2), 161-171. https://doi.org/10.1038/s41550-017-0338-3

Jets powered by active galactic nuclei appear impressively stable compared with their terrestrial and laboratory counterparts—they can be traced from their origin to distances exceeding their injection radius by up to a billion times. However, some l... Read More about Reconfinement and loss of stability in jets from active galactic nuclei.

Resistive tearing instability in electron MHD: application to neutron star crusts (2016)
Journal Article
Gourgouliatos, K. N., & Hollerbach, R. (2016). Resistive tearing instability in electron MHD: application to neutron star crusts. Monthly Notices of the Royal Astronomical Society, 463(3), 3381-3389. https://doi.org/10.1093/mnras/stw2309

We study a resistive tearing instability developing in a system evolving through the combined effect of Hall drift in the electron magnetohydrodynamic limit and Ohmic dissipation. We explore first the exponential growth of the instability in the line... Read More about Resistive tearing instability in electron MHD: application to neutron star crusts.