Grant number: CE170100004 | Funding period: 2017 - 2024
Completed
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..
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..
T Cheunchitra, A Melatos, RL Webster
2025-11-20
The luminosity distance–redshift (D <inf>L</inf>–z) relation derived from Type Ia supernovae (SNe Ia) yields evidence for a nonzer..
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..
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 ..
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..
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 ..
AF Vargas, A Melatos
Results are presented for a semicoherent search for gravitational waves from the low-mass x-ray binary Scorpius X-1 in Observing R..
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..
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..
AF Vargas, JB Carlin, A Melatos
Stochastic fluctuations in the spin frequency of a rotation-powered pulsar affect how accurately one measures the power-law brakin..
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
Pulsar timing arrays (PTAs) are designed to detect nanohertz-frequency gravitational waves (GWs). Since GWs are anticipated from c..
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..
H Tong, N Guttman, TA Clarke, PD Lasky, E Thrane, E Payne, R Nathan, B Farr, M Fishbach, G Ashton, VD Marco
It has become increasingly useful to answer questions in gravitational-wave astronomy using transdimensional models, where the num..
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..
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..
The Newtonian restricted three-body problem involving a positive primary point mass, m+, and a negative secondary point mass, m-, ..
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..
The inner and outer cores of neutron stars are believed to contain type-I and -II proton superconductors, respectively. The type-I..
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
Pulsar timing arrays (PTA) can detect continuous nanohertz gravitational waves (GW) emitted by individual supermassive black hole ..
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..
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..
V Di Marco, A Zic, RM Shannon, E Thrane
A number of pulsar timing arrays have recently reported preliminary evidence for the existence of a nanohertz frequency gravitatio..
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..
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..
W Dong, A Melatos
Oscillating neutron stars are sources of continuous gravitational waves. We study analytically the excitation of stellar oscillati..
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..
YSC Lee, M Millhouse, A Melatos
Detection confidence of the source-agnostic gravitational-wave burst search pipeline BayesWave is quantified by the log signal-ver..
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..
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..
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..
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..
SJ Magnall, DJ Price, PD Lasky, HJ MacPherson
2023-11-15
We perform three-dimensional simulations of homogeneous and inhomogeneous cosmologies via the coupling of the einstein toolkit num..
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..
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..
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..
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..
Stochastic temporal wandering of the spin frequency ν of a rotation-powered pulsar (i.e. the achromatic component of timing noise ..
C Liu, S Suvorova, RJ Evans, W Moran, A Melatos
Filtering of circular data from noisy measurements is well known to be a hard problem because of the ambiguity of the wrapped phas..
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
Pulsar timing arrays aim to detect nanohertz-frequency gravitational waves (GWs). A background of GWs modulates pulsar arrival tim..
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
The noise in millisecond pulsar (MSP) timing data can include contributions from observing instruments, the interstellar medium, t..
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..
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. ..
N Lu, K Wette, SM Scott, A Melatos
Detection of continuous gravitational waves from rapidly spinning neutron stars opens up the possibility of examining their intern..
A Melatos, M Millhouse
Superfluid vortex avalanches are one plausible cause of pulsar glitch activity. If they occur according to a state-dependent Poiss..
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..
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..
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 ..
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 ..
Detecting random processes on a circle has been studied for many decades. The Neyman-Pearson detector, which evaluates the likelih..
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..
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 ..
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..
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..
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 ..
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..
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 ..
S Abramson, W Moran, R Evans, A Melatos
Inference and hypothesis testing are typically constructed on the basis that a specific model holds for the data. To determine the..
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..
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..
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) ..
M Millhouse, A Melatos, G Howitt, JB Carlin, L Dunn, G Ashton
Radio pulsar glitches probe far-from-equilibrium processes involving stress accumulation and relaxation in neutron star interiors...
JW Gardner, H Middleton, C Liu, A Melatos, R Evans, W Moran, D Beniwal, HT Cao, C Ingram, D Brown, S Ng
Gravitational-wave observatories around the world are searching for continuous waves: persistent signals from sources, such as spi..
2022-03-15
Perceptions of political bias in the media are formed directly, through the independent consumption of the published outputs of a ..
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..
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..
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..
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..
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 ..
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,..
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..
2021-08-10
Stress accumulation-relaxation meta-models of pulsar glitches make precise, microphysics-agnostic predictions of long-term glitch ..
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..
J Paynter, R Webster, E Thrane
2021-06-01
If gamma-ray bursts are at cosmological distances, they must be gravitationally lensed occasionally<sup>1,2</sup>. The detection o..
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..
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..
2021-03-16
The global gravitational-wave detector network achieves higher detection rates, better parameter estimates, and more accurate sky ..
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..
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..
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..
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..
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 ..
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..
2020-05-01
A microphysics-agnostic meta-model of rotational glitches in rotation-powered pulsars is developed, wherein the globally averaged ..
2020-01-01
The growing number of black hole binary (BHB) mergers detected by the Laser Interferometer Gravitational-Wave Observatory have the..
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
Gravitational waves from coalescing neutron stars encode information about nuclear matter at extreme densities, inaccessible by la..
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..
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..
2019-10-01
Among the five pulsars with the most recorded rotational glitches, only PSR J0534+2200 is found to have an autocorrelation between..
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..
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..
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..
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..
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..
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..
2019-03-11
Glitching pulsars fall broadly into two statistical classes: those with Poisson-like waiting times and power-law sizes, and those ..
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..
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..
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..
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 ..
LV Drummond, A Melatos
2018-03-01
The equilibrium configurations of neutron superfluid vortices interacting with proton superconductor flux tubes in a rotating, har..
2017-12-21
Three-dimensional, Gross-Pitaevskii equation (GPE) simulations are presented of the interaction between neutron superfluid vortice..
W Fulgenzi, A Melatos, BD Hughes
2017-10-01
Gross-Pitaevskii simulations of vortex avalanches in a neutron star superfluid are limited computationally to ≲10<sup>2</sup> vort..
2017-09-21
Some exact, nonlinear, vacuum gravitational wave solutions are derived for certain polynomial f(R) gravities. We show that the bou..
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..