Quasi-periodic oscillations in superfluid, relativistic magnetars with nuclear pasta phases

Please use this identifier to cite or link to this item: http://hdl.handle.net/10045/58274
Información del item - Informació de l'item - Item information
Title: Quasi-periodic oscillations in superfluid, relativistic magnetars with nuclear pasta phases
Authors: Passamonti, Andrea | Pons, José A.
Research Group/s: Astrofísica Relativista
Center, Department or Service: Universidad de Alicante. Departamento de Física Aplicada
Keywords: Methods: numerical | Stars: magnetars | Stars: magnetic field | Stars: neutron | Stars: oscillations
Knowledge Area: Astronomía y Astrofísica
Issue Date: 1-Dec-2016
Publisher: Oxford University Press
Citation: Monthly Notices of the Royal Astronomical Society. 2016, 463(2): 1173-1184. doi:10.1093/mnras/stw1880
Abstract: We study the torsional magneto-elastic oscillations of relativistic superfluid magnetars and explore the effects of a phase transition in the crust–core interface (nuclear pasta) which results in a weaker elastic response. Exploring various models with different extension of nuclear pasta phases, we find that the differences in the oscillation spectrum present in purely elastic modes (weak magnetic field) are smeared out with increasing strength of the magnetic field. For magnetar conditions, the main characteristic and features of models without nuclear pasta are preserved. We find, in general, two classes of magneto-elastic oscillations which exhibit a different oscillation pattern. For Bp < 4 × 1014 G, the spectrum is characterized by the turning points and edges of the continuum which are mostly confined into the star's core, and have no constant phase. Increasing the magnetic field, we find, in addition, several magneto-elastic oscillations which reach the surface and have an angular structure similar to crustal modes. These global magneto-elastic oscillations show a constant phase and become dominant when Bp > 5 × 1014 G. We do not find any evidence of fundamental pure crustal modes in the low-frequency range (below 200 Hz) for Bp ≥ 1014 G.
Sponsor: AP acknowledges support from the European Union under the Marie Sklodowska Curie Actions Individual Fellowship, grant agreement no 656370. This work is supported in part by the Spanish MINECO grant AYA2015-66899-C2-2-P, the programme PROMETEOII-2014-069 (Generalitat Valenciana), and by the NewCompstarCOST action MP1304.
URI: http://hdl.handle.net/10045/58274
ISSN: 0035-8711 (Print) | 1365-2966 (Online)
DOI: 10.1093/mnras/stw1880
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Peer Review: si
Publisher version: http://dx.doi.org/10.1093/mnras/stw1880
Appears in Collections:INV - Astrofísica Relativista - Artículos de Revistas

Files in This Item:
Files in This Item:
File Description SizeFormat 
Thumbnail2016_Passamonti_Pons_MNRAS.pdf4,53 MBAdobe PDFOpen Preview

Items in RUA are protected by copyright, with all rights reserved, unless otherwise indicated.