Magnetar birth: rotation rates and gravitational-wave emission

  title={Magnetar birth: rotation rates and gravitational-wave emission},
  author={Samuel K. Lander and D. I. Jones},
  journal={Monthly Notices of the Royal Astronomical Society},
  • S. K. LanderD. Jones
  • Published 31 October 2019
  • Physics
  • Monthly Notices of the Royal Astronomical Society
Understanding the evolution of the angle χ between a magnetar’s rotation and magnetic axes sheds light on the star’s birth properties. This evolution is coupled with that of the stellar rotation Ω, and depends on the competing effects of internal viscous dissipation and external torques. We study this coupled evolution for a model magnetar with a strong internal toroidal field, extending previous work by modelling – for the first time in this context – the strong protomagnetar wind acting… 

Figures from this paper

The Life Cycle of Magnetars: A Novel Approach to Estimate Their Ages

  • T. Mondal
  • Physics
    The Astrophysical Journal Letters
  • 2021
Anomalous X-ray pulsars and soft gamma repeaters are slowly rotating, young, and isolated neutron stars exhibiting sporadic outbursts and high X-ray quiescent luminosities. They are believed to be

Gravitational waves from mountains in newly born millisecond magnetars

In this paper we study the spin-evolution and gravitational-wave luminosity of a newly born millisecond magnetar, formed either after the collapse of a massive star or after the merger of two neutron

The Evolutionary Effects of the Radius and Moment of Inertia of Rapidly Rotating Neutron Stars

A newly born millisecond magnetar is thought to be the central engine of some gamma-ray bursts (GRBs), especially those that present long-lasting X-ray plateau emissions. By solving the field

Magnetic field configurations in neutron stars from MHD simulations

We have studied numerically the evolution of magnetic fields in barotropic neutron stars, by performing nonlinear magnetohydrodynamical simulations with the code PLUTO. For both initially

Gamma-Ray Thermalization and Leakage from Millisecond Magnetar Nebulae: Toward a Self-consistent Model for Superluminous Supernovae

Superluminous supernovae (SLSNe) are massive star explosions that are too luminous to be powered by traditional energy sources, such as the radioactive decay of 56Ni. Instead, they may be powered by

GRB 111209A/SN 2011kl: Collapse of a Supramassive Magnetar with r-mode Oscillation and Fallback Accretion onto a Newborn Black Hole

Ultra-long-duration gamma-ray burst GRB 111209A was found to be associated with a very luminous supernovae (SNe) SN 2011kl. The physics of GRB 111209A/SN 2011kl has been extensively studied in the

Resolving dichotomy in compact objects through continuous gravitational waves observation

More than two dozen soft gamma-ray repeaters (SGRs) and anomalous X-ray pulsars (AXPs) have been detected so far. These are isolated compact objects. Many of them are either found to be associated

Electromagnetic counterparts of compact binary mergers

The first detection of a binary neutron star merger through gravitational waves and photons marked the dawn of multimessenger astronomy with gravitational waves, and it greatly increased our insight

Generating neutron-star magnetic fields: three dynamo phases

Young neutron stars (NSs) have magnetic fields in the range 10 − 10 G, believed to be generated by dynamo action at birth. We argue that such a dynamo is actually too inefficient to explain the

Timescales for Detection of Super-Chandrasekhar White Dwarfs by Gravitational-wave Astronomy

Over the past two decades, the inference of the violation of the Chandrasekhar mass limit of white dwarfs (WDs) from indirect observation has been a revolutionary discovery in astronomy. Various



Early evolution of newly born magnetars with a strong toroidal field

We present a state-of-the-art scenario for newly born magnetars as strong sources of gravitational waves (GWs) in the early days after formation. We address several aspects of the astrophysics of

Neutron-star spindown and magnetic inclination-angle evolution

A rotating fluid star, endowed with a magnetic field, can undergo a form of precessional motion: a sum of rigid-body free precession and a non-rigid response. On secular timescales this motion is

Gravitational Radiation from Newborn Magnetars in the Virgo Cluster

There is growing evidence that two classes of high-energy sources, the soft gamma repeaters and the anomalous X-ray pulsars, contain slowly spinning "magnetars," i.e., neutron stars whose emission is

Magnetar Spin-Down, Hyperenergetic Supernovae, and Gamma-Ray Bursts

The Kelvin-Helmholtz cooling epoch, lasting tens of seconds after the birth of a neutron star in a successful core-collapse supernova, is accompanied by a neutrino-driven wind. For magnetar-strength

Proto-Neutron Star Winds with Magnetic Fields and Rotation

We solve the one-dimensional neutrino-heated nonrelativistic magnetohydrodynamic (MHD) wind problem for conditions that range from slowly rotating (spin period P ≳ 10 ms) proto-neutron stars (PNSs)

Relativistic magnetohydrodynamics winds from rotating neutron stars

We solve for the time-dependent dynamics of axisymmetric, general relativistic magnetohydrodynamic winds from rotating neutron stars. The mass-loss rate as a function of latitude is obtained

Magnetar Spindown, Hyper-energetic Supernovae, & Gamma Ray Bursts

The Kelvin-Helmholtz cooling epoch, lasting tens of seconds after the birth of a neutron star in a successful core-collapse supernova, is accompanied by a neutrino-driven wind. For magnetar-strength


We show that energy deposited into an expanding supernova remnant by a highly magnetic (B ∼ 5 × 1014 G) neutron star spinning at an initial period of Pi ≈ 2–20 ms can substantially brighten the light

Neutrino viscosity and drag: impact on the magnetorotational instability in protoneutron stars

The magneto-rotational instability (MRI) is a promising mechanism to amplify the magnetic field in fast rotating proto-neutron stars (PNS). The diffusion of neutrinos trapped in the proto-neutron

The Proto-Magnetar Model for Gamma-Ray Bursts

Long duration Gamma-Ray Bursts (GRBs) originate from the core collapse of massive stars, but the identity of the central engine remains elusive. Previous work has shown that rapidly spinning,