Arc Centre of Excellence for Gravitational Wave Discovery

An extremely fast fading population II dwarf nova candidate: caught spectroscopically on the rise

N Van Bemmel, J Zhang, J Cooke, A Möller, AW Shafter, I Andreoni, K Auchettl, D Buckley, J Carney, D Dobie, J Freeburn, B Gendre, V Kansal, I Monageng, A Rau, N Rawat, M Suhr, EN Taylor

2026-03-01

In the first observational run of the Kilonova and Transients Programme (KNTraP), a rapidly evolving optical transient, KNTraP2022..

Hierarchical Bayesian estimation of population-level torque law parameters from 68 young radio pulsars observed with the Murriyang telescope

AF Vargas, A Melatos, JB Carlin, ME Lower, S Johnston, P Weltevrede

2026-01-01

The measured braking index, of a rotation-powered pulsar with spin frequency (where an overdot symbolizes a time derivative) and b..

Dedicated-frequency analysis of gravitational-wave bursts from core-collapse supernovae with minimal assumptions

YSC Lee, MJ Szczepańczyk, T Mishra, M Millhouse, A Melatos

2025-10-30

Gravitational-wave (GW) emissions from core-collapse supernovae (CCSNe) provide insights into the internal processes leading up to..

Magellanic Accretion-powered Pulsars Studied via an Unscented Kalman Filter

DM Christodoulou, J O’Leary, A Melatos, T Kimpson, S Bhattacharya, NJ O’Neill, SGT Laycock, D Kazanas

2025-08-01

Magnetized high-mass X-ray binary pulsars accreting from a surrounding disk have been recently studied by a time-dependent Kalman ..

Flux tube clustering from magnetic coupling of adjacent type-I and -II superconductors in a neutron star: persistent gravitational radiation

KH Thong, A Melatos

2025-06-01

Adjacent type-I and -II proton superconductors in a rotation-powered pulsar are predicted to exist in a metastable state containin..

How much spin wandering can continuous gravitational wave search algorithms handle

JB Carlin, A Melatos

2025-04-15

The canonical signal model in continuous gravitational wave searches is deterministic, and stable over the long integration times ..

Search for gravitational waves from Scorpius X-1 with a hidden Markov model in O3 LIGO data with a corrected orbital ephemeris

AF Vargas, A Melatos

2025-04-15

Results are presented for a semicoherent search for gravitational waves from the low-mass x-ray binary Scorpius X-1 in Observing R..

Observing Rayleigh-Taylor Stable and Unstable Accretion Through a Kalman Filter Analysis of X-Ray Pulsars in the Small Magellanic Cloud

J O’Leary, A Melatos, T Kimpson, DM Christodoulou, NJ O’Neill, PM Meyers, S Bhattacharya, SGT Laycock

2025-03-10

Global, three-dimensional magnetohydrodynamic simulations of Rayleigh-Taylor instabilities at the disk-magnetosphere boundary of r..

An optically led search for kilonovae to z∼0.3 with the Kilonova and Transients Programme (KNTraP)

N Van Bemmel, J Zhang, J Cooke, A Rest, A Möller, I Andreoni, K Auchettl, D Dobie, B Gendre, S Goode, J Freeburn, DO Jones, CD Kilpatrick, A Lien, A Rau, L Spitler, M Suhr, F Valdes

2025-03-01

Compact binary mergers detectable in gravitational waves can be accompanied by a kilonova, an electromagnetic transient powered by..

Hierarchical Bayesian estimation of population-level torque law parameters from anomalous pulsar braking indices

AF Vargas, JB Carlin, A Melatos

2025-03-01

Stochastic fluctuations in the spin frequency of a rotation-powered pulsar affect how accurately one measures the power-law brakin..

Searching for Gravitational-Wave Bursts from Cosmic String Cusps with the Parkes Pulsar Timing Array’s Third Data Release

Y Xia, J Wang, S Kuroyanagi, W Yan, Y Wen, A Kapur, J Zou, Y Feng, V Di Marco, S Mishra, CJ Russell, S Wang, D Zhao, X Zhu

2025-03-01

Pulsar timing arrays (PTAs) are designed to detect nanohertz-frequency gravitational waves (GWs). Since GWs are anticipated from c..

GRB 220831A: a hostless, intermediate gamma-ray burst with an unusual optical afterglow

J Freeburn, B O’Connor, J Cooke, D Dobie, A Möller, N Tejos, J Zhang, P Beniamini, K Auchettl, J DeLaunay, S Dichiara, WF Fong, S Goode, A Gordon, CD Kilpatrick, A Lien, C Mihalenko, G Ryan, K Siellez, M Suhr

2025-02-01

GRB 220831A is a gamma-ray burst (GRB) with a duration and spectral peak energy that places it at the interface between the distri..

TRACKING SINUSOIDAL SIGNALS WITH TIME VARYING FREQUENCY USING OPTIMAL CONTROL

RJ Evans, C Liu, GN Nair, S Suvorova, B Moran

2025-01-01

Sinusoidal signals with time varying frequency are widely encountered in real life applications. In this paper, we address the pro..

Adaptive cancellation of mains power interference in continuous gravitational wave searches with a hidden Markov model

T Kimpson, S Suvorova, H Middleton, C Liu, A Melatos, R Evans, W Moran

2024-12-15

Continuous gravitational wave searches with terrestrial, long-baseline interferometers are hampered by long-lived, narrow band fea..

Newtonian restricted three-body gravitational problem with positive and negative point masses

KH Thong, A Melatos

2024-12-15

The Newtonian restricted three-body problem involving a positive primary point mass, m+, and a negative secondary point mass, m-, ..

Kalman tracking and parameter estimation of continuous gravitational waves with a pulsar timing array

T Kimpson, A Melatos, J O’Leary, JB Carlin, RJ Evans, W Moran, T Cheunchitra, W Dong, L Dunn, J Greentree, NJ O’Neill, S Suvorova, KH Thong, AF Vargas

2024-11-01

Continuous nanohertz gravitational waves from individual supermassive black hole binaries may be detectable with pulsar timing arr..

Magnetic coupling through flux branching of adjacent type-I and -II superconductors in a neutron star

KH Thong, A Melatos

2024-11-01

The inner and outer cores of neutron stars are believed to contain type-I and -II proton superconductors, respectively. The type-I..

State-space analysis of a continuous gravitational wave source with a pulsar timing array: Inclusion of the pulsar terms

T Kimpson, A Melatos, J O'Leary, JB Carlin, RJ Evans, W Moran, T Cheunchitra, W Dong, L Dunn, J Greentree, NJ O'Neill, S Suvorova, KH Thong, AF Vargas

2024-11-01

Pulsar timing arrays (PTA) can detect continuous nanohertz gravitational waves (GW) emitted by individual supermassive black hole ..

Probing the soft X-ray properties and multi-wavelength variability of SN2023ixf and its progenitor

S Panjkov, K Auchettl, BJ Shappee, A Do, L Lopez, JF Beacom

2024-09-24

We present a detailed analysis of nearly two decades of optical/UV and X-ray data to study the multi-wavelength pre-explosion prop..

Measuring the Magnetic Dipole Moment and Magnetospheric Fluctuations of Accretion-powered Pulsars in the Small Magellanic Cloud with an Unscented Kalman Filter

J O’Leary, A Melatos, T Kimpson, NJ O’Neill, PM Meyers, DM Christodoulou, S Bhattacharya, SGT Laycock

2024-08-01

Many accretion-powered pulsars rotate in magnetocentrifugal disequilibrium, spinning up or down secularly over multiyear intervals..

Systematic errors in searches for nanohertz gravitational waves

V Di Marco, A Zic, RM Shannon, E Thrane

2024-08-01

A number of pulsar timing arrays have recently reported preliminary evidence for the existence of a nanohertz frequency gravitatio..

Analysing radio pulsar timing noise with a Kalman filter: a demonstration involving PSR J1359−6038

NJ O’Neill, PM Meyers, A Melatos

2024-06-01

In the standard two-component crust-superfluid model of a neutron star, timing noise can arise when the two components are perturb..

Comparing Recent Pulsar Timing Array Results on the Nanohertz Stochastic Gravitational-wave Background

G Agazie, J Antoniadis, A Anumarlapudi, AM Archibald, P Arumugam, S Arumugam, Z Arzoumanian, J Askew, S Babak, M Bagchi, M Bailes, ASB Nielsen, PT Baker, CG Bassa, A Bathula, B Bécsy, A Berthereau, NDR Bhat, L Blecha, M Bonetti

2024-05-01

The Australian, Chinese, European, Indian, and North American pulsar timing array (PTA) collaborations recently reported, at varyi..

Gravitational waves from non-radial oscillations of stochastically accreting neutron stars

W Dong, A Melatos

2024-05-01

Oscillating neutron stars are sources of continuous gravitational waves. We study analytically the excitation of stellar oscillati..

Axion sourcing in dense stellar matter via CP -violating couplings

F Anzuini, A Gómez-Bañón, JA Pons, A Melatos, PD Lasky

2024-04-15

Compact objects such as neutron stars and white dwarfs can source axionlike particles and QCD axions due to CP-violating axion-fer..

Impact of noise transients on gravitational-wave burst detection efficiency of the BayesWave pipeline with multidetector networks

YSC Lee, M Millhouse, A Melatos

2024-04-15

Detection confidence of the source-agnostic gravitational-wave burst search pipeline BayesWave is quantified by the log signal-ver..

Measuring the Magnetic Dipole Moment and Magnetospheric Fluctuations of SXP 18.3 with a Kalman Filter

Joseph O'Leary, Andrew Melatos, Nicholas J O'Neill, Patrick M Meyers, Dimitris M Christodoulou, Sayantan Bhattacharya, Silas GT Laycock

2024-04-01

The magnetic dipole moment μ of an accretion-powered pulsar in magnetocentrifugal equilibrium cannot be inferred uniquely from tim..

Search for continuous gravitational waves directed at subthreshold radiometer candidates in O3 LIGO data

AM Knee, H Du, E Goetz, J McIver, JB Carlin, L Sun, L Dunn, L Strang, H Middleton, A Melatos

2024-03-15

We present results of a follow-up search for continuous gravitational waves (CWs) associated with subthreshold candidates from the..

Persistent gravitational radiation from glitching pulsars II. Updated scaling with vortex number

T Cheunchitra, A Melatos, JB Carlin, G Howitt

2024-02-01

Superfluid vortices pinned to nuclear lattice sites or magnetic flux tubes in a neutron star evolve abruptly through a sequence of..

Magnetically confined mountains on accreting neutron stars in general relativity

PHB Rossetto, J Frauendiener, R Brunet, A Melatos

2023-12-01

The general relativistic formulation of the problem of magnetically confined mountains on neutron stars is presented, and the resu..

Toward Robust Detections of Nanohertz Gravitational Waves

V Di Marco, A Zic, MT Miles, DJ Reardon, E Thrane, RM Shannon

2023-10-01

The recent observation of a common red-noise process in pulsar timing arrays (PTAs) suggests that the detection of nanohertz gravi..

Reconstructing the cruise-phase trajectory of deep-space probes in a general relativistic framework: An application to the Cassini gravitational wave experiment

J O’Leary, JP Barriot

2023-09-01

Einstein’s theory of general relativity is playing an increasingly important role in fields such as interplanetary navigation, ast..

Discerning media bias within a network of political allies and opponents: Disruption by partisans

Y Bu, A Melatos

2023-08-15

An individual's opinions about media bias derive from their own independent assessment of media outputs combined with peer pressur..

A new small glitch in Vela discovered with a hidden Markov model

L Dunn, A Melatos, CM Espinoza, D Antonopoulou, R Dodson

2023-07-01

A striking feature of the Vela pulsar (PSR J0835−4510) is that it undergoes sudden increases in its spin frequency, known as glitc..

Apparent dispersion in pulsar braking index measurements caused by timing noise

AF Vargas, A Melatos

2023-07-01

Stochastic temporal wandering of the spin frequency ν of a rotation-powered pulsar (i.e. the achromatic component of timing noise ..

Least-square Fitting on the Circle using Optimal Control

C Liu, S Suvorova, RJ Evans, W Moran, A Melatos

2023-07-01

Filtering of circular data from noisy measurements is well known to be a hard problem because of the ambiguity of the wrapped phas..

Search for an Isotropic Gravitational-wave Background with the Parkes Pulsar Timing Array

DJ Reardon, A Zic, RM Shannon, GB Hobbs, M Bailes, V Di Marco, A Kapur, AF Rogers, E Thrane, J Askew, NDR Bhat, A Cameron, M Curyło, WA Coles, S Dai, B Goncharov, M Kerr, A Kulkarni, Y Levin, ME Lower

2023-07-01

Pulsar timing arrays aim to detect nanohertz-frequency gravitational waves (GWs). A background of GWs modulates pulsar arrival tim..

The Gravitational-wave Background Null Hypothesis: Characterizing Noise in Millisecond Pulsar Arrival Times with the Parkes Pulsar Timing Array

DJ Reardon, A Zic, RM Shannon, V Di Marco, GB Hobbs, A Kapur, ME Lower, R Mandow, H Middleton, MT Miles, AF Rogers, J Askew, M Bailes, NDR Bhat, A Cameron, M Kerr, A Kulkarni, RN Manchester, RS Nathan, CJ Russell

2023-07-01

The noise in millisecond pulsar (MSP) timing data can include contributions from observing instruments, the interstellar medium, t..

Seismic noise characterisation at a potential gravitational wave detector site in Australia

H Satari, C Blair, L Ju, D Blair, C Zhao, E Saygin, P Meyers, D Lumley

2023-06-01

A critical consideration in the design of next-generation gravitational wave detectors is the understanding of the seismic environ..

Stability of interlinked neutron vortex and proton flux-tube arrays in a neutron star - III. Proton feedback

KH Thong, A Melatos, LV Drummond

2023-06-01

The coupled, time-dependent Gross-Pitaevskii and Ginzburg-Landau equations are solved simultaneously in three dimensions to invest..

A Statistical Search for a Uniform Trigger Threshold in Solar Flares from Individual Active Regions

JB Carlin, A Melatos, MS Wheatland

2023-05-01

Solar flares result from the sudden release of energy deposited by subphotospheric motions into the magnetic field of the corona. ..

Inferring neutron star properties with continuous gravitational waves

N Lu, K Wette, SM Scott, A Melatos

2023-05-01

Detection of continuous gravitational waves from rapidly spinning neutron stars opens up the possibility of examining their intern..

Measuring the Vortex−Nucleus Pinning Force from Pulsar Glitch Rates

A Melatos, M Millhouse

2023-05-01

Superfluid vortex avalanches are one plausible cause of pulsar glitch activity. If they occur according to a state-dependent Poiss..

Magnetic Dynamo Caused by Axions in Neutron Stars

F Anzuini, JA Pons, A Gómez-Bañón, PD Lasky, F Bianchini, A Melatos

2023-02-17

The coupling between axions and photons modifies Maxwell's equations, introducing a dynamo term in the magnetic induction equation..

Localisation of gamma-ray bursts from the combined SpIRIT plus HERMES-TP/SP nano-satellite constellation

M Thomas, M Trenti, A Sanna, R Campana, G Ghirlanda, J Ripa, L Burderi, F Fiore, Y Evangelista, L Amati, S Barraclough, K Auchettl, MO del Castillo, A Chapman, M Citossi, A Colagrossi, G Dilillo, N Deiosso, E Demenev, F Longo

2023-02-08

Multi-messenger observations of the transient sky to detect cosmic explosions and counterparts of gravitational wave mergers criti..

Tracking Hidden Magnetospheric Fluctuations in Accretion-powered Pulsars With a Kalman Filter

A Melatos, NJ O’Neill, PM Meyers, J O’Leary

2023-02-01

X-ray flux and pulse period fluctuations in an accretion-powered pulsar convey important information about the disk-magnetosphere ..

Detection and Estimation of Randomly Phase Modulated Signals

C Liu, S Suvorova, RJ Evans, B Moran, A Melatos

2023-01-01

The design of detectors for weak sinusoidal signals with random varying phase and frequency has been studied for many decades and ..

Estimating and detecting random processes on the unit circle

C Liu, S Suvorova, RJ Evans, W Moran, A Melatos

2023-01-01

Detecting random processes on a circle has been studied for many decades. The Neyman-Pearson detector, which evaluates the likelih..

Validating continuous gravitational-wave candidates from a semicoherent search using Doppler modulation and an effective point spread function

D Jones, L Sun, J Carlin, L Dunn, M Millhouse, H Middleton, P Meyers, P Clearwater, D Beniwal, L Strang, A Vargas, A Melatos

2022-12-15

Following up large numbers of candidates in continuous gravitational-wave searches presents a challenge, particularly in regard to..

Repeated Mergers of Black Hole Binaries: Implications for GW190521

O Anagnostou, M Trenti, A Melatos

2022-12-01

The gravitational wave event GW190521 involves the merger of two black holes of ∼85 M <inf>⊙</inf> and ∼66 M <inf>⊙</inf> forming ..

Search for continuous gravitational waves from HESS J1427-608 with a hidden Markov model

D Beniwal, P Clearwater, L Dunn, L Strang, G Rowell, A Melatos, D Ottaway

2022-11-15

We present a search for continuous gravitational-wave signals from an unidentified pulsar potentially powering HESS J1427-608, a s..

Low coherency of wind induced seismic noise: implications for gravitational wave detection

H Satari, C Blair, L Ju, D Blair, C Zhao, E Saygin, P Meyers, D Lumley

2022-11-03

Seismic noise poses challenges for gravitational wave detection. Effective vibration isolation and methods to subtract unshieldabl..

The 'Giraffe': Discovery of a stripped red giant in an interacting binary with an ∼2 Mlower giant

T Jayasinghe, TA Thompson, CS Kochanek, KZ Stanek, DM Rowan, DV Martin, K El-Badry, PJ Vallely, JT Hinkle, D Huber, H Isaacson, J Tayar, K Auchettl, I Ilyin, AW Howard, C Badenes

2022-11-01

We report the discovery of a stripped giant + lower giant Algol-type binary, 2M04123153+6738486 (2M0412), identified during a sear..

Vacillating about media bias: Changing one's mind intermittently within a network of political allies and opponents

NKY Low, A Melatos

2022-10-15

One form of long-term behavior revealed by opinion dynamics simulations is intermittency, where an individual cycles between eras ..

Thermal luminosity degeneracy of magnetized neutron stars with and without hyperon cores

F Anzuini, A Melatos, C Dehman, D Viganò, JA Pons

2022-09-01

The dissipation of intense crustal electric currents produces high Joule heating rates in cooling neutron stars. Here, it is shown..

Mountain formation by repeated, inhomogeneous crustal failure in a neutron star

AD Kerin, A Melatos

2022-08-01

The elastic crust of a neutron star fractures repeatedly as it spins down electromagnetically. An idealized, macroscopic model of ..

Testing for a Random Walk Structure in the Frequency Evolution of a Tone in Noise

S Abramson, W Moran, R Evans, A Melatos

2022-08-01

Inference and hypothesis testing are typically constructed on the basis that a specific model holds for the data. To determine the..

Antiglitches in accreting pulsars from superfluid vortex avalanches

G Howitt, A Melatos

2022-07-01

Three sudden spin-down events, termed 'antiglitches', were recently discovered in the accreting pulsar NGC 300 ULX-1 by the Neutro..

Systematic upper limits on the size of missing pulsar glitches in the first UTMOST open data release

L Dunn, A Melatos, S Suvorova, W Moran, RJ Evans, S Osłowski, ME Lower, M Bailes, C Flynn, V Gupta

2022-05-01

A systematic, semi-automated search for pulsar glitches in the first UTMOST public data release is presented. The search is carrie..

An estimate of the stochastic gravitational wave background from the MassiveBlackII simulation

B Sykes, H Middleton, A Melatos, T Di Matteo, C Degraf, A Bhowmick

2022-04-01

A population of supermassive black hole (SMBH) binaries is expected to generate a stochastic gravitational wave background (SGWB) ..

An updated glitch rate law inferred from radio pulsars

M Millhouse, A Melatos, G Howitt, JB Carlin, L Dunn, G Ashton

2022-04-01

Radio pulsar glitches probe far-from-equilibrium processes involving stress accumulation and relaxation in neutron star interiors...

Continuous gravitational waves in the lab: Recovering audio signals with a table-top optical microphone

JW Gardner, H Middleton, C Liu, A Melatos, R Evans, W Moran, D Beniwal, HT Cao, C Ingram, D Brown, S Ng

2022-04-01

Gravitational-wave observatories around the world are searching for continuous waves: persistent signals from sources, such as spi..

Discerning media bias within a network of political allies and opponents: The idealized example of a biased coin

NKY Low, A Melatos

2022-03-15

Perceptions of political bias in the media are formed directly, through the independent consumption of the published outputs of a ..

Graphics processing unit implementation of the F-statistic for continuous gravitational wave searches

L Dunn, P Clearwater, A Melatos, K Wette

2022-02-17

The F-statistic is a detection statistic used widely in searches for continuous gravitational waves with terrestrial, long-baselin..

Rapid Stellar and Binary Population Synthesis with COMPAS

J Riley, P Agrawal, JW Barrett, KNK Boyett, FS Broekgaarden, D Chattopadhyay, SM Gaebel, F Gittins, R Hirai, G Howitt, S Justham, L Khandelwal, F Kummer, MYM Lau, I Mandel, SE De Mink, C Neijssel, T Riley, L Van Son, S Stevenson

2022-02-01

Compact Object Mergers: Population Astrophysics and Statistics (COMPAS; https://compas.science) is a public rapid binary populatio..

Bayesian Detection of a Sinusoidal Signal With Randomly Varying Frequency

C Liu, S Suvorova, RJ Evans, B Moran, A Melatos

2022-01-01

The problem of detecting a sinusoidal signal with randomly varying frequency has a long history. It is one of the core problems in..

Impact of Schumann resonances on the Einstein Telescope and projections for the magnetic coupling function

K Janssens, K Martinovic, N Christensen, PM Meyers, M Sakellariadou

2021-12-15

Correlated magnetic noise in the form of Schumann resonances could introduce limitations to the gravitational-wave background sear..

The impact of glitches on young pulsar rotational evolution

ME Lower, S Johnston, L Dunn, RM Shannon, M Bailes, S Dai, M Kerr, RN Manchester, A Melatos, LS Oswald, A Parthasarathy, C Sobey, P Weltevrede

2021-12-01

We report on a timing programme of 74 young pulsars that have been observed by the Parkes 64-m radio telescope over the past decad..

Inferring properties of neutron stars born in short gamma-ray bursts with a plerion-like X-ray plateau

LC Strang, A Melatos, N Sarin, PD Lasky

2021-10-01

Time-resolved spectra of six short gamma-ray bursts (sGRBs), measured by the Swift telescope, are used to estimate the parameters ..

Rapid parameter estimation of a two-component neutron star model with spin wandering using a Kalman filter

PM Meyers, NJ O'neill, A Melatos, RJ Evans

2021-09-01

The classic, two-component, crust-superfluid model of a neutron star can be formulated as a noise-driven, linear dynamical system,..

Hidden Markov model tracking of continuous gravitational waves from a binary neutron star with wandering spin. III. Rotational phase tracking

A Melatos, P Clearwater, S Suvorova, L Sun, W Moran, RJ Evans

2021-08-15

A hidden Markov model (HMM) solved recursively by the Viterbi algorithm can be configured to search for persistent, quasimonochrom..

Long-term Statistics of Pulsar Glitches Due to History-dependent Avalanches

JB Carlin, A Melatos

2021-08-10

Stress accumulation-relaxation meta-models of pulsar glitches make precise, microphysics-agnostic predictions of long-term glitch ..

A linear inversion approach to measuring the composition and directionality of the seismic noise field

PM Meyers, T Prestegard, V Mandic, VC Tsai, DC Bowden, A Matas, G Pavlis, R Caton

2021-08-02

We develop a linear inversion technique for measuring the modal composition and directionality of ambient seismic noise. The techn..

Effects of periodicity in observation scheduling on parameter estimation of pulsar glitches

L Dunn, ME Lower, A Melatos

2021-07-01

In certain pulsar timing experiments, where observations are scheduled approximately periodically (e.g. daily), timing models with..

Evidence for an intermediate-mass black hole from a gravitationally lensed gamma-ray burst

J Paynter, R Webster, E Thrane

2021-06-01

If gamma-ray bursts are at cosmological distances, they must be gravitationally lensed occasionally^1,2. The detection o..

Deep exploration for continuous gravitational waves at 171-172 Hz in LIGO second observing run data DEEP EXPLORATION for CONTINUOUS GRAVITATIONAL ... WETTE et al.

K Wette, L Dunn, P Clearwater, A Melatos

2021-04-22

We pursue a novel strategy toward a first detection of continuous gravitational waves from rapidly rotating deformed neutron stars..

Search for continuous gravitational waves from ten H.E.S.S. sources using a hidden Markov model

D Beniwal, P Clearwater, L Dunn, A Melatos, D Ottaway

2021-04-15

Isolated neutron stars are prime targets for continuous-wave (CW) searches by ground-based gravitational-wave interferometers. Res..

Enhancing the gravitational-wave burst detection confidence in expanded detector networks with the BayesWave pipeline

YSC Lee, M Millhouse, A Melatos

2021-03-16

The global gravitational-wave detector network achieves higher detection rates, better parameter estimates, and more accurate sky ..

Simultaneous estimation of astrophysical and cosmological stochastic gravitational-wave backgrounds with terrestrial detectors

K Martinovic, PM Meyers, M Sakellariadou, N Christensen

2021-02-26

The recent Advanced LIGO and Advanced Virgo joint observing runs have not claimed a stochastic gravitational-wave background detec..

Parameter estimation of a two-component neutron star model with spin wandering

Patrick M Meyers, Andrew Melatos, Nicholas J O'Neill

2021-02-16

<jats:title>ABSTRACT</jats:title> <jats:p>It is an open challenge to estimate systematically the physical parameter..

Recycled pulsars with multipolar magnetospheres from accretion-induced magnetic burial

AG Suvorov, A Melatos

2020-12-01

Many millisecond pulsars are thought to be old neutron stars spun up ('recycled') during an earlier accretion phase. They typicall..

Detecting a stochastic gravitational-wave background in the presence of correlated magnetic noise

PM Meyers, K Martinovic, N Christensen, M Sakellariadou

2020-11-13

A detection of the stochastic gravitational-wave background (SGWB) from unresolved compact binary coalescences could be made by Ad..

Search for gravitational waves from 12 young supernova remnants with a hidden Markov model in Advanced LIGO's second observing run

Margaret Millhouse, Lucy Strang, Andrew Melatos

2020-10-21

Persistent gravitational waves from rapidly rotating neutron stars, such as those found in some young supernova remnants, may fall..

Simulating pulsar glitches: an N-body solver for superfluid vortex motion in two dimensions

G Howitt, A Melatos, B Haskell

2020-10-01

A rotating superfluid forms an array of quantized vortex lines that determine its angular velocity. The spasmodic evolution of the..

Site-selection criteria for the Einstein Telescope

Florian Amann, Fabio Bonsignorio, Tomasz Bulik, Henk Jan Bulten, Stefano Cuccuru, Alain Dassargues, Riccardo DeSalvo, Edit Fenyvesi, Francesco Fidecaro, Irene Fiori, Carlo Giunchi, Aniello Grado, Jan Harms, Soumen Koley, Laszlo Kovacs, Giovanni Losurdo, Vuk Mandic, Patrick Meyers, Luca Naticchioni, Frederic Nguyen

2020-09-01

The Einstein Telescope (ET) is a proposed next-generation, underground gravitational-wave detector to be based in Europe. It will ..

Search for gravitational waves from five low mass x-ray binaries in the second Advanced LIGO observing run with an improved hidden Markov model

Hannah Middleton, Patrick Clearwater, Andrew Melatos, Liam Dunn

2020-07-02

Low mass x-ray binaries are prime targets for continuous gravitational wave searches by ground-based interferometers. Results are ..

Pulsar Glitch Detection with a Hidden Markov Model

A Melatos, LM Dunn, S Suvorova, W Moran, RJ Evans

2020-06-10

Pulsar timing experiments typically generate a phase-connected timing solution from a sequence of times of arrival (TOAs) by absol..

Long-term statistics of pulsar glitches triggered by a Brownian stress accumulation process

JB Carlin, A Melatos

2020-05-01

A microphysics-agnostic meta-model of rotational glitches in rotation-powered pulsars is developed, wherein the globally averaged ..

Dynamically formed black hole binaries: In-cluster versus ejected mergers

O Anagnostou, M Trenti, A Melatos

2020-01-01

The growing number of black hole binary (BHB) mergers detected by the Laser Interferometer Gravitational-Wave Observatory have the..

Neutron Star Extreme Matter Observatory: A kilohertz-band gravitational-wave detector in the global network

K Ackley, VB Adya, P Agrawal, P Altin, G Ashton, M Bailes, E Baltinas, A Barbuio, D Beniwal, C Blair, D Blair, GN Bolingbroke, V Bossilkov, S Shachar Boublil, DD Brown, BJ Burridge, J Calderon Bustillo, J Cameron, H Tuong Cao, JB Carlin

2020-01-01

Gravitational waves from coalescing neutron stars encode information about nuclear matter at extreme densities, inaccessible by la..

Non-invasive in vivo hyperspectral imaging of the retina for potential biomarker use in Alzheimer’s disease

X Hadoux, F Hui, JKH Lim, CL Masters, A Pébay, S Chevalier, J Ha, S Loi, CJ Fowler, C Rowe, VL Villemagne, EN Taylor, C Fluke, JP Soucy, F Lesage, JP Sylvestre, P Rosa-Neto, S Mathotaarachchi, S Gauthier, ZS Nasreddine

2019-12-01

Studies of rodent models of Alzheimer’s disease (AD) and of human tissues suggest that the retinal changes that occur in AD, inclu..

Pulsar Glitch Activity as a State-dependent Poisson Process: Parameter Estimation and Epoch Prediction

A Melatos, LV Drummond

2019-11-01

Rotational glitches in some rotation-powered pulsars display power-law size and exponential waiting-time distributions. These stat..

Autocorrelations in pulsar glitch waiting times and sizes

JB Carlin, A Melatos

2019-10-01

Among the five pulsars with the most recorded rotational glitches, only PSR J0534+2200 is found to have an autocorrelation between..

Direct observations of surface-wave eigenfunctions at the homestake 3d array

P Meyers, DC Bowden, T Prestegard, VC Tsai, V Mandic, G Pavlis, R Caton

2019-08-01

Despite the theory for both Rayleigh and Love waves being well accepted and the theoretical predictions accurately matching observ..

Search strategies for long gravitational-wave transients: Hidden Markov model tracking and seedless clustering

Sharan Banagiri, Ling Sun, Michael W Coughlin, Andrew Melatos

2019-07-16

A number of detections have been made in the past few years of gravitational waves from compact binary coalescences. While there e..

Plerion model of the X-ray plateau in short gamma-ray bursts

LC Strang, A Melatos

2019-06-25

Many short gamma-ray bursts (sGRBs) exhibit a prolonged plateau in the X-ray light curve following the main burst. It is shown tha..

Reconstructing gravitational wave core-collapse supernova signals with dynamic time warping

Sofia Suvorova, Jade Powell, Andrew Melatos

2019-06-17

Core-collapse supernovae (CCSNe) are a potential source for ground-based gravitational wave detectors, as their predicted emission..

Tracking continuous gravitational waves from a neutron star at once and twice the spin frequency with a hidden Markov model

L Sun, A Melatos, PD Lasky

2019-06-13

Searches for continuous gravitational waves from rapidly spinning neutron stars normally assume that the star rotates about one of..

Application of hidden Markov model tracking to the search for long-duration transient gravitational waves from the remnant of the binary neutron star merger GW170817

L Sun, A Melatos

2019-06-06

The nature of the postmerger remnant of GW170817, the first binary neutron star coalescence observed by the Advanced Laser Interfe..

First search for a stochastic gravitational-wave background from ultralight bosons

L Tsukada, T Callister, A Matas, P Meyers

2019-05-15

Ultralight bosons with masses in the range 10-13 eV≤mb≤10-12 eV can induce a superradiant instability around spinning black holes ..

Directed searches for gravitational waves from ultralight bosons

M Isi, L Sun, R Brito, A Melatos

2019-04-15

Gravitational-wave detectors can be used to search for yet-undiscovered ultralight bosons, including those conjectured to solve pr..

Generating quasi-periodic pulsar glitches using a state-dependent Poisson process

JB Carlin, A Melatos

2019-03-11

Glitching pulsars fall broadly into two statistical classes: those with Poisson-like waiting times and power-law sizes, and those ..

Temporal clustering of rotational glitches in the Crab pulsar

JB Carlin, A Melatos, D Vukcevic

2019-01-21

It is an open question whether glitch activity in individual pulsars varies on decadal time-scales. The Crab pulsar has experience..

Phase-Continuous Frequency Line Track-Before-Detect of a Tone with Slow Frequency Variation

S Suvorova, A Melatos, RJ Evans, W Moran, P Clearwater, L Sun

2018-12-15

We consider optimal Bayesian detection of a slowly varying tone of unknown amplitude in situations characterized by very low signa..

Nonparametric Estimation of the Size and Waiting Time Distributions of Pulsar Glitches

G Howitt, A Melatos, A Delaigle

2018-11-01

Glitch size and waiting time probability density functions (PDFs) are estimated for the five pulsars that have glitched the most u..

Size-waiting-time Correlations in Pulsar Glitches

A Melatos, G Howitt, W Fulgenzi

2018-08-20

Few statistically compelling correlations are found in pulsar timing data between the size of a rotational glitch and the time to ..

Stability of interlinked neutron vortex and proton flux-tube arrays in a neutron star - II. Far-from-equilibrium dynamics

LV Drummond, A Melatos

2018-03-01

The equilibrium configurations of neutron superfluid vortices interacting with proton superconductor flux tubes in a rotating, har..

Stability of interlinked neutron vortex and proton flux tube arrays in a neutron star: Equilibrium configurations

LV Drummond, A Melatos

2017-12-21

Three-dimensional, Gross-Pitaevskii equation (GPE) simulations are presented of the interaction between neutron superfluid vortice..

Radio pulsar glitches as a state-dependent Poisson process

W Fulgenzi, A Melatos, BD Hughes

2017-10-01

Gross-Pitaevskii simulations of vortex avalanches in a neutron star superfluid are limited computationally to ≲10² vort..

Causal properties of nonlinear gravitational waves in modified gravity

AG Suvorov, A Melatos

2017-09-21

Some exact, nonlinear, vacuum gravitational wave solutions are derived for certain polynomial f(R) gravities. We show that the bou..

Validating gravitational-wave detections: The Advanced LIGO hardware injection system

C Biwer, D Barker, JC Batch, J Betzwieser, RP Fisher, E Goetz, S Kandhasamy, S Karki, JS Kissel, AP Lundgren, DM Macleod, A Mullavey, K Riles, JG Rollins, KA Thorne, E Thrane, TD Abbott, B Allen, DA Brown, P Charlton

2017-03-27

Hardware injections are simulated gravitational-wave signals added to the Laser Interferometer Gravitational-wave Observatory (LIG..

Hidden Markov model tracking of continuous gravitational waves from a binary neutron star with wandering spin. II. Binary orbital phase tracking

S Suvorova, P Clearwater, A Melatos, L Sun, W Moran, RJ Evans

2017-01-01

A hidden Markov model (HMM) scheme for tracking continuous-wave gravitational radiation from neutron stars in low-mass x-ray binar..