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The Radius of the Neutron Star PSR J0614-3329 from NICER Data
M. C. Miller, A. J. Dittmann, I. M. Holt +14
Neutron star radius measurements, particularly using X-ray data collected with the Neutron star Interior Composition Explorer (NICER), have provided invaluable information for mode…
Detailed Timing, Spectral, and Polarimetric Analysis of Magnetar 1RXS J170849.0-400910
Rachael Stewart, George Younes, Alice Harding +5
We present a broadband timing, spectral, and polarimetric study of the magnetar 1RXS~J170849.0-400910 using XMM-Newton, NuSTAR, and IXPE. The pulse morphology evolves strongly acro…
Magnetar Fireballs and Short Bursts: Curved Spacetime Lensing, QED Effects, Spectra, Polarization, and Impulse Responses
Zorawar Wadiasingh, Hoa Dinh Thi, Constantinos Kalapotharakos +12
Magnetar short bursts (SBs) are hard X-ray transients of durations s peaking at keV, and are prime targets for new high-energy missions and polarimeters. The…
The swept-back multipolar magnetic field of neutron stars: Application to NICER MSP J0030+0451
Anu Kundu, Constantinos Kalapotharakos, Zorawar Wadiasingh +5
NICER observations of millisecond pulsars (MSPs) suggest that non-dipolar magnetic fields are required to explain their surface X-ray hotspots. C. Kalapotharakos et al. modeled the…
On the Expected Orbitally-modulated TeV Signatures of Spider Binaries: The Effect of Intrabinary Shock Geometry
Christo Venter, Andreas Kopp, Zorawar Wadiasingh +2
'Spider' binary systems - black widow and redback compact binaries differentiated by their companion's mass and nature - are an important type of pulsar system exhibiting a rich em…
A Comprehensive Interpretation of Fermi-LAT Pulsars: Fundamental-Plane Death Border, Visibility Thresholds, and GeV-TeV Unification
Constantinos Kalapotharakos, Zorawar Wadiasingh, Alice K. Harding +2
We present a framework that links equatorial-current-sheet (ECS) physics to catalog-level, phase-averaged gamma-ray pulsar properties. Guided by analytic scalings and particle-in-c…
Pulsed, Polarized X-ray Emission from Neutron Star Surfaces: the Effects of Vacuum Birefringence in the Magnetosphere
Hoa Dinh Thi, Matthew G. Baring, Kun Hu +4
Intense magnetic fields in the atmospheres of neutron stars render non-trivial angular dependence of intensity and polarization of soft X-ray emission originating from their surfac…
Vacuum birefringence and the polarized X-ray emission from a radio magnetar
Rachael E. Stewart, Hoa Dinh Thi, George Younes +13
Magnetars are isolated neutron stars with exceptionally strong surface fields exceeding G. Their bright X-ray emission probes physical regimes in which quantum electrodyn…
Towards Modelling AR Sco: Calibration -- Reproducing High-Energy Pulsar Emission and Testing Convergence to Aristotelian Electrodynamics
Louis Du Plessis, Christo Venter, Alice K. Harding +2
In recent years, kinetic simulations have been crucial to further our understanding of pulsar electrodynamics. Yet, due to the large-scale separation between the gyro-period vs the…
Magnetosphere Evolution and Precursor-Driven Electromagnetic Signals in Merging Binary Neutron Stars
Dimitrios Skiathas, Constantinos Kalapotharakos, Zorawar Wadiasingh +3
We detail new force-free simulations to investigate magnetosphere evolution and precursor electromagnetic (EM) signals from binary neutron stars. Our simulations fully follow a rep…
Timing and Spectral Evolution of the Magnetar 1E 1841-045 in Outburst
G. Younes, S. K. Lander, M. G. Baring +19
We present the timing and spectral analyses of the NICER, NuSTAR, and IXPE observations of the magnetar 1E 1841-045 covering 82 days following its August 2024 bursting activity as…
Pioneering High-Speed Pulsar Parameter Estimation Using Convolutional Neural Networks
Greg Olmschenk, Emily Broadbent, Constantinos Kalapotharakos +5
Accurate thermal emission models of neutron stars are essential for constraining the dense matter equation of state. However, incorporating realistic magnetic field structures is c…
X-ray polarization of the magnetar 1E 1841-045
Rachael Stewart, George A. Younes, Alice K. Harding +15
We report on IXPE and NuSTAR observations beginning forty days after the 2024 outburst onset of magnetar 1E 1841-045, marking the first IXPE observation of a magnetar in an enhance…
Towards Modelling AR Sco: Generalised Particle Dynamics and Strong Radiation-Reaction Regimes
L. Du Plessis, C. Venter, A. K. Harding +3
Numerical simulations of relativistic plasmas have become more feasible, popular, and crucial for various astrophysical sources with the availability of computational resources. Th…
New Neighbours: Modelling the Growing Population of Gamma-ray Millisecond Pulsars
C. Venter, A. K. Harding, T. J. Johnson
The Fermi Large Area Telescope, in collaboration with several groups from the radio community, have had marvellous success at uncovering new gamma-ray millisecond pulsars (MSPs). I…