Magnetic Field Decay and Period Evolution of Anomalous X-Ray Pulsars in the Context of Quark Stars

Abstract

We discuss a model wherein soft gamma-ray repeaters (SGRs), anomalous X-ray pulsars (AXPs), and radio quiet isolated neutron stars (RQINSs) are all compact objects exhibiting superconductivity, namely color-flavor locked quark stars. In particular we calculate the magnetic field decay due to the expulsion of spin-induced vortices from the star's superfluid-superconducting interior, and the resultant spin-down rate. We find that, for initial parameters characteristic of AXPs/SGRs ($10^{13}<B<10^{14}\mathrm{G}$; $3<P<12\mathrm{s}$), the magnetic field strengths and periods remain unchanged within a factor of two for timescales of the order of $5\times 10^5-5\times 10^7\mathrm{yrs}$ given a quark star of radius $10\mathrm{km}$. Within these timescales, we show that the observed period clustering in RQINSs can be explained by compactness, as well as calculate how the magnetic field and period evolve in a manner concurrent with RQINS observations.

arXiv comment4 pages, 4 figures, accepted to ApJ Letters

References in corpus (11)

• Enforced Electrical Neutrality of the Color-Flavor Locked Phase
• Electric fields at the quark surface of strange stars in the color-flavor locked phase
• Isolated Neutron Stars: Accretors and Coolers
• Period clustering of the Anomalous X-ray Pulsars and magnetic field decay in magnetars
• Quark-Nova
• A Glitch in an Anomalous X-ray Pulsar
• Neutrino Emission and Mass Ejection in Quark Novae
• Meissner Effect and Vortex Dynamics in Quark Stars -- A Model for Soft Gamma-Ray Repeaters
• The effect of the neutron star crust on the evolution of a core magnetic field
• Implications of the Narrow Period Distribution of Anomalous X-ray Pulsars and Soft Gamma-Ray Repeaters
• Neutron Star Vortex Dynamics and Magnetic Field Decay: Implications for High Density Nuclear Matter

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• The Meissner Effect and Vortex Expulsion in Color-Superconducting Quark stars, and its Role for Re-heating of Magnetars
• Quark-Novae in Low-Mass X-ray Binaries with massive neutron stars: A universal model for short-hard Gamma-Ray Bursts
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• Quark Matter in Neutron Stars: An apercu
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• Quark-nova remnants IV: Application to radio emitting AXP transients
• SGRs and AXPs proposed as ancestors of the Magnificent seven
• A three stage model for the inner engine of GRBs: Prompt emission and early afterglow