Publications (25)
MeerCRAB: MeerLICHT Classification of Real and Bogus Transients using Deep Learning
Zafiirah Hosenie, Steven Bloemen, Paul Groot +13
Astronomers require efficient automated detection and classification pipelines when conducting large-scale surveys of the (optical) sky for variable and transient sources. Such pip…
Multi-wavelength, Multi-Messenger Pulsar Science in the SKA Era
John Antoniadis, Lucas Guillemot, Andrea Possenti +6
The Square Kilometre Array (SKA) is an integral part of the next-generation observatories that will survey the Universe across the electromagnetic spectrum, and beyond, revolutioni…
First systematic study reporting the changes in eclipse cut-off frequency for pulsar J1544+4937
Sangita Kumari, Bhaswati Bhattacharyya, Rahul Sharan +3
We present results from a long-term monitoring of frequency dependent eclipses of the radio emission from PSR J1544+4937 which is a ``black widow spider'' millisecond pulsar (MSP)…
Unraveling the Eclipse Mechanism of a Binary Millisecond Pulsar Using Broadband Radio Spectra
Devojyoti Kansabanik, Bhaswati Bhattacharyya, Jayanta Roy +1
The frequency dependent eclipses of the radio emission from millisecond pulsars (MSPs) in compact binary systems provide an opportunity to understand the eclipse mechanism and to d…
Understanding Pulsar Wind Nebulae with the SKA
Joseph D. Gelfand, C. -Y. Ng, B. Posselt +9
Produced by the interaction between the ``pulsar wind'' powered by the rotational energy of a neutron star and its surroundings, the study of pulsar wind nebulae (PWNe) provides vi…
MeerTRAP in the era of multi-messenger astrophysics
Kaustubh Rajwade, Benjamin Stappers, Christopher Williams +9
Real-time detections of transients and rapid multi-wavelength follow-up are at the core of modern multi-messenger astrophysics. MeerTRAP is one such instrument that has been deploy…
Discovery of a radio emitting neutron star with an ultra-long spin period of 76 seconds
Manisha Caleb, Ian Heywood, Kaustubh Rajwade +19
The radio-emitting neutron star population encompasses objects with spin periods ranging from milliseconds to tens of seconds. As they age and spin more slowly, their radio emissio…
The orbital-decay test of general relativity to the 2% level with 6-year VLBA astrometry of the double neutron star PSR J1537+1155
Hao Ding, Adam Deller, Emmanuel Fonseca +3
PSR J1537+1155, also known as PSR B1534+12, is the second discovered double neutron star (DNS) binary. More than 20 years of timing observations of PSR J1537+1155 have offered some…
High-Angular-Resolution and High-Sensitivity Science Enabled by Beamformed ALMA
Vincent Fish, Walter Alef, James Anderson +66
An international consortium is presently constructing a beamformer for the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile that will be available as a facility instrum…
Spectro-temporal analysis of a sample of bursts from FRB 121102
Kaustubh Rajwade, Mitchell Mickaliger, Benjamin Stappers +4
FRB~121102 was the first Fast Radio Burst (FRB) that was shown to repeat. Since its discovery in 2012, more than two hundred bursts have been detected from the source. These bursts…
Understanding Pulsar Wind Nebulae with the SKA
Joseph D. Gelfand, C. -Y. Ng, B. Posselt +9
Produced by the interaction between the ``pulsar wind'' powered by the rotational energy of a neutron star and its surroundings, the study of pulsar wind nebulae (PWNe) provides vi…
Missing for 20 years: MeerKAT re-detects the elusive binary pulsar M30B
Vishnu Balakrishnan, Paulo Freire, Scott Ransom +14
PSR J21402311B is a 13-ms pulsar discovered in 2001 in a 7.8-hour Green Bank Telescope (GBT) observation of the core-collapsed globular cluster M30 and predicted to be in a high…
A fast radio burst from the first 3 billion years of the Universe
Manisha Caleb, Themiya Nanayakkara, Benjamin Stappers +25
Fast radio bursts (FRBs) are enigmatic millisecond-duration signals which encode otherwise unattainable information on the plasma which permeates our Universe, providing insights i…
Comparing Multi-class, Binary and Hierarchical Machine Learning Classification schemes for variable stars
Zafiirah Hosenie, Robert Lyon, Benjamin Stappers +1
Upcoming synoptic surveys are set to generate an unprecedented amount of data. This requires an automatic framework that can quickly and efficiently provide classification labels f…
First search for long-duration transient gravitational waves after glitches in the Vela and Crab pulsars
David Keitel, Graham Woan, Matthew Pitkin +7
Gravitational waves (GWs) can offer a novel window into the structure and dynamics of neutron stars. Here we present the first search for long-duration quasi-monochromatic GW trans…
Localising fast radio bursts and other transients using interferometric arrays
Monika Obrocka, Benjamin Stappers, Peter Wilkinson
A new population of sources emitting fast and bright transient radio bursts has recently been identified. The observed large dispersion measure values of FRBs suggests an extragala…
Dense matter with eXTP
Anna L. Watts, Wenfei Yu, Juri Poutanen +73
In this White Paper we present the potential of the Enhanced X-ray Timing and Polarimetry (eXTP) mission for determining the nature of dense matter; neutron star cores host an extr…
A joint MeerKAT and Parkes view of Omega Centauri: New TRAPUM Searches and Pulsar Timing
Miquel Colom i Bernadich, Shi Dai, Federico Abbate +27
Millisecond pulsars (MSPs) are powerful probes of globular clusters (GCs), tracing stellar evolution, cluster dynamics, and the local gravitational potential. We investigate the MS…
Two New Black Widow Millisecond Pulsars In M28
Andrew Douglas, Prajwal Padmanabh, Scott Ransom +18
We report the discovery of two Black Widow millisecond pulsars in the globular cluster M28 with the MeerKAT telescope. PSR J18242452M (M28M) is a 4.78-ms pulsar in a hou…
Very long baseline astrometry of PSR J1012+5307 and its implications on alternative theories of gravity
Hao Ding, Adam T. Deller, Paulo Freire +4
PSR J1012+5307, a millisecond pulsar in orbit with a helium white dwarf (WD), has been timed with high precision for about 25 years. One of the main objectives of this long-term ti…
Imbalance Learning for Variable Star Classification
Zafiirah Hosenie, Robert Lyon, Benjamin Stappers +2
The accurate automated classification of variable stars into their respective sub-types is difficult. Machine learning based solutions often fall foul of the imbalanced learning pr…
The Northern High Time Resolution Universe Pulsar Survey I: Setup and initial discoveries
Ewan D. Barr, David J. Champion, Michael Kramer +10
We report on the setup and initial discoveries of the Northern High Time Resolution Universe survey for pulsars and fast transients, the first major pulsar survey conducted with th…
NuSTAR Observations of the State Transition of Millisecond Pulsar Binary PSR J1023+0038
Shriharsh P. Tendulkar, Chengwei Yang, Hongjun An +19
We report NuSTAR observations of the millisecond pulsar - low mass X-ray binary (LMXB) transition system PSR J1023+0038 from June and October 2013, before and after the formation o…
Wide field beamformed observation with MeerKAT
Weiwei Chen, Ewan Barr, Ramesh Karuppusamy +2
Large-scale beamforming with radio interferometers has the potential to revolutionize the science done with pulsars and fast radio bursts by improving the survey efficiency for the…
Unveiling frequency-dependent eclipsing in spider millisecond pulsars using broadband polarization observations with the Parkes
Sangita Kumari, Bhaswati Bhattacharyya, Rahul Sharan +6
This study presents an orbital phase-dependent analysis of three black widow spider millisecond pulsars (BW MSPs), aiming to investigate the magnetic field within the eclipse envir…