6 papers
Discovering pulsars in compact binaries with a hidden Markov model
Joseph O'Leary, Liam Dunn, Andrew Melatos
Discovering radio pulsars in compact binaries, whose orbital periods satisfy , is computationally challenging, because the time-depend…
Is there a retrograde accretion disk around 4U 162667? Tracking torque reversals with a state-space model
Joseph O'Leary, Andrew Melatos, Tom Kimpson +5
X-ray timing studies of the persistent, Galactic, accretion-powered pulsar 4U 162667 reveal torque reversals, during which the pulse frequency alternates between multiye…
Measuring the crust-superfluid coupling time-scale for 105 UTMOST pulsars with a Kalman filter
Wenhao Dong, Andrew Melatos, Nicholas J. O'Neill +2
Crust-superfluid coupling plays an important role in neutron star rotation, particularly with respect to timing noise and glitches. Here, we present new timing-noise-based estimate…
Argus: JAX state-space filtering for gravitational wave detection with a pulsar timing array
Tom Kimpson, Nicholas J. O'Neill, Patrick M. Meyers +1
Argus is a high-performance Python package for detecting and characterising nanohertz gravitational waves in pulsar timing array data. The package provides a complete Bayesian infe…
Quadrupole Moment of a Magnetically Confined Mountain on an Accreting Neutron Star in General Relativity
Pedro Henrique Barboza Rossetto, Jörg Frauendiener, Andrew Melatos
General relativistic corrections are calculated for the quadrupole moment of a magnetically confined mountain on an accreting neutron star. The hydromagnetic structure of the mount…
Axion sourcing in dense stellar matter via CP-violating couplings
Filippo Anzuini, Antonio Gómez-Bañón, José A. Pons +2
Compact objects such as neutron stars and white dwarfs can source axion-like particles and QCD axions due to CP-violating axion-fermion couplings. The magnitude of the axion field…