Fast radio bursts (FRBs) continue to raise more questions than they answer. Until last year, only one burst – the only one known to repeat - had been localized to a bright radio nebula (either a youn... moreg supernova remnant or pulsar wind nebulae) in a distant dwarf galaxy.
Over the last three years searches with the Australian Square Kilometre Array Pathfinder (ASKAP) have detected 35 bursts, eight of which have been localised to host galaxies at redshifts ranging from 0.1 to 0.5. These bursts and their hosts are very unlike the repeater, suggesting there may be a dichotomy in the population. However one of the arcminute-localised ASKAP FRBs has recently been found to repeat.
Here we propose to search and study repetitions in this FRB population. Our comprehensive sample and a dense monitoring campaign of well localised bursts, at a fluence limit more than 60 times lower than that of their detections to characterise the fraction of bursts that repeat. For bursts that repeat the unique wide bandwidth observations will be used to test leading models of burst emission.less
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 02 Jun 2020
We propose timing observations of southern double neutron star (DNS) systems to obtain precise estimates
of the component masses and thus increase the statistics of neutron star mass distribution. Th... moree improved
sensitivity of the Ultra Wideband Low (UWL) receiver will provide a 3X increase in the precision of the time
of arrivals (ToAs) of the pulses compared to the multibeam data. This has the potential to perform quick
measurements of masses for a number of binary systems in the next 1-2 years. We will also use MeerKAT
observations at crucial orbital phases to increase our chances of mass measurements. Increase in the number
of measured NS masses has significant implications for understanding NS internal structure and for stellar
and binary evolution physics.less
Australia Telescope National Facility - P1032 - Mass measurements of southern binary pulsar systems - Published 02 Jun 2020
We propose to carry out a Parkes timing campaign of the new millisecond pulsar, J1431-6328, discovered by the Australian SKA Pathfinder (ASKAP) and Parkes Ultra-Wideband Low (UWL) receiver. PSR J1431-... more6328 has a spin period of 2.77 ms and is in a very wide binary system with an orbital period of 88 days. The relatively low mass of the companion and the long orbital period make this binary system extremely interesting for the understanding of binary evolution. The wide orbit of J1431-6328 also makes it useful for tests of the strong equivalence principle. The proposed program will allow us to better measure its binary parameters and to achieve more precise localisation of the pulsar, which is crucial for the optical follow-up of the system.less
Australia Telescope National Facility - P1058 - Timing of the first ASKAP pulsar J1431-6328 - Published 02 Jun 2020
These data were captured as part of the CSIRO Data Practices and Attitudes Survey. The data files contain the R script and the set of measures used for the multi-level modelling of organisational, dis... moreciplinary and domain factors which influence research data sharing practices. For this reason there are four data files, one representing the data aggregated by disciplinary group (discipline_aggregation), one representing the data aggregated by organisational unit (orgunit_aggregation), one representing the data aggregated by domain group (domain_aggregation), and the corresponding R script. less
Group - Knowledge Discovery & Management - - Published 02 Jun 2020
The Galactic Center (GC) is a key target for the radio component of Breakthrough Listen (BL) program. Offering the largest amount of stars in any given direction in the sky, the GC is widely cited as ... morea location believed to harbour advanced civilizations, and it is also the most energetic region in the Milky Way. We aim to conduct BL-GC Survey with Parkes radio telescope for around 350 hours. We will cover the frequency range from 700 MHz to 4 GHz, utilizing the newly installed ultra-wideband receiver. Our team has already leveraged both standard and bespoke tools to construct a flexible software stack to search data for signals of interest. We will look for signals from extraterrestrial intelligence (ETI) by searching for both simple narrow-band signals and complex modulated signals. Along with that, as an ancillary science, we will also search for accelerated pulsars — likely orbiting a supermassive black hole at the centre of the Milky Way Galaxy. Data products produced during this program will also be publically available to engage larger pulsar communityless
Australia Telescope National Facility - PX600 - Breakthrough Listen Commensal Project: Galactic Centre - Published 02 Jun 2020
This record describes the deep-sea sediment core products by Holder et al. (2020) from two sites in the Sabrina Coast continental slope and rise, the first sedimentary sequences investigated in this r... moreegion of the East Antarctic.
The cores were used to study changes in the oceanic and depositional environment and their interaction with the nearby Totten Glacier. The two archives show clear variations between glacial and interglacial phases over the last 350 Kyrs, driven by the movement of the ice sheet advancing and retreating over the continental shelf and ocean circulation patterns that deliver heat either close to the Antarctic coastline or further away from the continental slope.
This research provided a foundation for future palaeoceanographic work in the region and suggested that warm oceanic conditions, similar to today, have influenced the Sabrina Coast during past warm interglacials over the last 350 Kyrs.
For more details please refer to the cited article (download link provided below):
Holder, L., M. Duffy, B. Opdyke, A. Leventer, A. Post, P. O’Brien and L. K. Armand (2020): Controls on Sedimentation and Primary Productivity in Late Pleistocene Slope Sediments Seaward of the Totten Glacier, East Antarctica. Paleoceanography, under review.less
Marine National Facility - MNF Investigator Processed Datasets - Published 01 Jun 2020
We propose to continue the PULSE@Parkes project in which high school students from Australia and around the World use the Parkes radio telescope in a remote observing model to observe and analyse puls... morear data. The data from some PULSE@Parkes observations are used to support the FERMI Gamma ray mission, other observations supplement the P456 Pulsar Timing Array project and the remainder were chosen in order to make a detailed analysis of pulsar timing irregularities and intermittency.less
Australia Telescope National Facility - P595 - PULSE@Parkes (Pulsar Student Exploration at Parkes) - Published 01 Jun 2020
Daily (1990-2014) reference evapotranspiration (FAO-56) across Victoria at a spatial resolution of 9 seconds (approx. 250 m).
Acquired - - Published 01 Jun 2020
Daily (1981-2019), monthly (1981-2019) and mean monthly (1981-2010) surfaces of minimum temperature (approx. 1.2 m from ground) across Victoria at a spatial resolution of 9 seconds (approx. 250 m). Su... morerfaces are developed using trivariate splines (latitude, longitude and elevation) with partial dependence upon a topographic index of relative elevation and standardised night time MODIS land surface temperature.less
Daily (1981-2019), monthly (1981-2019) and mean monthly (1981-2010) surfaces of precipitation across Victoria at a spatial resolution of 9 seconds (approx. 250 m).
Daily (1981-2019), monthly (1981-2019) and mean monthly (1981-2010) surfaces of minimum temperature (approx. 1.2 m from ground) across Victoria at a spatial resolution of 9 seconds (approx. 250 m). Su... morerfaces are developed using trivariate splines (latitude, longitude and elevation) with partial dependence upon a topographic index of relative elevation.less
Daily (1981-2019), monthly (1981-2019) and mean monthly (1981-2010) surfaces of minimum temperature (approx. 1.2 m from ground) across Victoria at a spatial resolution of 9 seconds (approx. 250 m). Su... morerfaces are developed using bivariate splines (latitude and longitude) with partial dependence upon elevation.less
Daily (1981-2019), monthly (1981-2019) and mean monthly (1981-2010) surfaces of maximum temperature (approx. 1.2 m from ground) across Victoria at a spatial resolution of 9 seconds (approx. 250 m). Su... morerfaces are developed using ordinary trivariate splines (full spline dependence upon latitude, longitude and elevation).
Daily (1981-2019), monthly (1981-2019) and mean monthly (1981-2010) surfaces of maximum temperature (approx. 1.2 m from ground) across Victoria at a spatial resolution of 9 seconds (approx. 250 m). Su... morerfaces are developed using trivariate splines (latitude, longitude and elevation) with partial dependence upon standardised day time MODIS land surface temperature. less
Daily (1981-2019), monthly (1981-2019) and mean monthly (1981-2010) surfaces of 9am vapour pressure across Victoria at a spatial resolution of 9 seconds (approx. 250 m).
Physiological data (such as heart rate, shell gape) of sets of oysters deployed at two marine sites in the D'Entrecasteaux Channel, Tasmania, Australia: Coningham (approximately 43.091 S 147.303 E), a... morend Redcliffs (approximately 43.310 S 147.085 E).
Water quality data (such as DO, Salinity, pH, Turbidity, Temp, Cond) for both Redcliffs and Coningham (also known as Tinderbox) site.
Sensors were deployed on 9th Nov 2018 at Coningham, and 18th Dec at Redcliffs. The dateset contains the measured water quality and oyster's physiological data up to 15 March 2019. At Redcliffs, there were four functional biosensors placed at the depth of 0.5, 1.5, 5, and 7 meters to measure the oyster's physiological data. On the other hand, there were five biosensors deployed at Coningham at the depth of 0.5, 1.5, 3.5, 5, and 10 meters.
The water quality at each site was measured using a YSI EXO2 multiparameter sonde at 5 m depth. less
Sentinel sensors: revolutionising our understanding and management of the estuarine environment - - Published 01 Jun 2020
We propose to observe the magnetars 1E 1547.0-5408 and PSR J1622-4950
approximately weekly, to track their rotation, flux density, and
polarisation, as we have long been doing through this project. ... moreThe
revolutionary UWL capabilities promise new opportunities to disentangle
still mysterious radio emission mechanisms in magnetars. This promise
is supported by the recent follow up of XTE J1810-197, again a radio
magnetar after 10 years dormant, for which our observations with
the UWL receiver are providing unique and tantalizing measurements
of its radio spectrum and polarisation.less
Australia Telescope National Facility - P885 - Understanding the Remarkable Behaviour of Radio Magnetars - Published 01 Jun 2020
We recently discovered five millisecond pulsars (MSPs) in the globular cluster Omega Centauri. This is the first pulsar discovery in this globular cluster. Four of these pulsars are isolated with spin... more periods of 4.1, 4.2, 4.6 and 6.8ms. The fifth has a spin period of 4.8ms and is in an eclipsing binary system with an orbital period of 2.1 hours. We propose to carry out a timing campaign of these new pulsars in order to study the dynamics in the core of Omega Centauri, to reveal the origin of Gamma-ray emission from the core, and to probe the ionised interstellar medium in Omega Centauri. Our proposed observations will also enable us to carry out deeper searches of pulsars in the cluster.less
Australia Telescope National Facility - P1041 - Timing of millisecond pulsars in Globular Cluster Omega Centauri - Published 01 Jun 2020
The Parkes Pulsar Timing Array (PPTA) project has three primary goals: (a) detection of gravitational waves from astronomical sources, (b) establishment of a pulsar timescale, and (c) improvement of o... moreur understanding of Solar-system dynamics. The PPTA is the oldest of three international pulsar timing groups. We have the smallest telescope and the smallest group, but the best measurements and the best results. Our bound on the strength of the incoherent gravitational wave background is the only bound which significantly constrains theoretical models. We have maintained our leading position because: we have the southern sky; we have a small but well-focussed group; we have the best-calibrated receivers; and we have been able to observe with an almost regular cadence of 15 to 20 days over a wide bandwidth. With this proposal we aim to maintain our pre-eminent position in the field.
Unlike most observing proposals, this is a continuing proposal for which the observations will continue to improve bounds on ultra-low-frequency gravitational waves until they are finally detected. Continued Parkes observations will remain valuable at least until the first stage of the SKA is able to improve on our sensitivity and observing cadence. Even after the gravitational wave background is detected we will want to continue observations in support of the nascent field of gravitational wave astronomy!less
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 31 May 2020
Australia Telescope National Facility - PX600 - Breakthrough Listen Commensal Project: Galactic Centre - Published 31 May 2020
DNA sequence data alignments, partitioning information and resulting phylogenetic trees for study of evolutionary relationships of the groundsel tribe (Senecioneae) of the daisy family (Asteraceae).
Strategic CANBR Research - - Published 31 May 2020
In the fast-moving world of Fast Radio Bursts (FRBs), the key question of what fraction (as high as 100%?) of FRBs emit repeat bursts remains unanswered. Of order 10 repeating FRBs are now known, and ... moretheir spectro-temporal properties hint at differences with apparently non-repeating bursts - but poor statistics preclude a definitive diagnosis. FRB 180301 is a promising source for further study for multiple reasons: it is the first repeating FRB seen by the FAST telescope, and has the second-highest rotation measure ever seen for a FRB (after the original repeater, FRB121102). We request Parkes observations with the UWL to characterise the broadband emission properties of this FRB, with the following key goals: to constrain the repetition rate, identify any variation of pulse characteristics over time, and provide insight into the emission mechanisms. In its initial detection, FRB 180301 was poorly fit by regular Faraday rotation models, and showed significant circular polarization, which may indicate the progenitor is embedded in an extreme magneto-ionic environment with complex field structure that has not been seen before. These observations will generate a large data volume. We will use the Medusa backend in parallel with the Breakthrough Listen data recorder (BL), and will transfer data to BL immediately after observations.These data will be used by P. Kumar to prototype a FRB pipeline for the UWL, that will be made broadly available for similar studies.less
Australia Telescope National Facility - P1068 - Monitoring the repeating FRB 180301 - Published 31 May 2020
The propagation of pulsar signal through the interstellar medium is affected by the fluctuations in the electron density in the line of sight from the pulsar to the observer. This is a frequency depen... moredent phenomenon and will produce brightness variations (scintillation) and also broadening of the otherwise narrow pulse (scatter-broadening). The effect of these two are measurable at different frequencies due to their strong dependence on frequency, viz., broadening will be evident at lower radio frequencies and scintillation will be clearly resolved at higher frequencies. With this proposal, we aim to study the evolution of scatter-broadening and scintillation properties of 137 pulsars with the UWL receiver, and verify their relationship with each other. With this experiment, we aim at testing some of the fundamental theories of ionised interstellar medium. This large sample will also help in improving the understanding of the turbulence characteristics in the inner Galaxy. We request a total of 149 hours for this project.less
Australia Telescope National Facility - P1064 - Probing the Ionised Interstellar Medium with Pulsars - Published 30 May 2020
We propose to monitor the potential repeating FRBs in the Southern Sky with luminosity di- chotomy criterion. With a success of luminosity-guided detection of a repeating source by FAST, we can contin... moreue to search for more repeaters hidden in current FRB sample according to luminosity dichotomy. Specifically, we select FRB 171020 and FRB 180923 as the targets of proposed obser- vations, which are located in the repeater population in the luminosity function. We demonstrate that the observing with 20 hours for each source is optimistic using Parkes ultra-wide-bandwidth receiver (UWL), if there are repeaters among them.less
Australia Telescope National Facility - P1062 - Monitoring the repeating FRB candidates in the Southern Sky - Published 30 May 2020
Australia Telescope National Facility - PX600 - Breakthrough Listen Commensal Project: Galactic Centre - Published 29 May 2020