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Showing results for: [ Astronomical and Space Sciences not elsewhere classified ]
We propose a targeted pulsar survey of twelve candidate sources that display interplanetary scintillation or linear polarisation in lower frequency observations using the Murchison Widefield Array (MW... moreA). Known pulsars have been detected using these characteristics. We request 12 hours of Parkes observations using the UWL receiver and back-end to conduct a sensitive and thorough pulsar search using novel techniques. Targeted searches for pulsars using imaging surveys have been revived in recent years due to the availability of new sensitive, broadband, widefield surveys using SKA precursors/pathfinders, and have already resulted in pulsar discoveries. Discovering new pulsars provides prospects for many science cases because pulsars provide powerful probes of the ISM and fundamental physics either individually or as a population.less
Australia Telescope National Facility - P1088 - Targeted survey of pulsar candidates identified via polarisation and interplanetary scintillation properties - Published 28 Jan 2021
This project aims to perform rapid measurements of relativistic parameters of southern binary pulsar systems enabling measurement of their component masses, using data from the Parkes Ultra-Wideband L... moreow (UWL) receiver and the MeerKAT telescope. We will use the UWL data to obtain significant orbital coverage on these pulsars and obtain crucial constraints on orbital and temporal DM variations that will help in constraining the nature of the companion. We will then use MeerKAT data at crucial orbital phases to improve our chances of measuring relativistic parameters, and hence the component masses. Increase in the number of measured NS masses has profound implications for NS internal structure and for stellar and binary evolution physics.less
Australia Telescope National Facility - P1032 - Mass measurements of southern binary pulsar systems - Published 28 Jan 2021
PSR~J1759-2402 is one of a small handful of pulsars which are in orbit about high mass stars. Its orbital period is 8.3 years and the orbit is highly eccentric with periastron expected in 2021 March. ... moreAlthough discovered at Parkes, the Lovell telescope has been monitoring the pulsar over many years. However, it’s restricted bandwidth, maintenance schedule and poorer polarization capability make it unsuitable to follow the pulsar as it enters and leaves the eclipse by the companion. In contrast, the UWL on Parkes with its wide- band and excellent polarization characteristics means that we can determine scattering, polarization, dispersion measure and rotation measure changes as the pulsar enters its companion wind. We request a continuation of our weekly observations of the pulsar to track its progress around the orbit.less
Australia Telescope National Facility - P1038 - Wide-band observations of PSR J1759-2402 through periastron - Published 28 Jan 2021
We have re-processed all the observations in the Parkes pulsar data archive obtained during the first four years of the Parkes multibeam receiver and have discovered two new fast radio bursts (FRBs) a... morend five single pulse candidates (SPCs) from unknown sources, but with Galactic dispersion measures. These signals were only detected in a single beam of the receiver suggesting that they are unlikely to be terrestrial. There are no known pulsars in the pointing direction of the five SPCs and therefore are likely giant pulses from currently unknown pulsars. Using the Ultra Wideband Low (UWL) receiver we have opportunity to detect repeating signals from the two FRBs and to confirm the five SPCs. Our previous observations have obtained new detections for one of these targets and therefore confirming that source. Therefore we propose for more observation in an attempt to confirm the remainder and to study the newly discovered source.less
Australia Telescope National Facility - P1040 - Follow-up observations of transient events detected in the Parkes data archive - Published 28 Jan 2021
We request time to observe 260 pulsars on a regular basis to provide the accurate ephemerides necessary for the detection and characterisation of gamma-ray pulsars with the Fermi satellite. The main s... morecience goals are to increase the number of known gamma-ray pulsars (both radio-loud and radio-quiet), to determine accurate pulse profiles, and to characterise their high energy (phase-resolved) spectra. In the radio, the observations will also allow us to find glitches, characterise timing noise, investigate dispersion and rotation measure variability, and enhance our knowledge of single pulse phenomenology. To date, we are (co-)authors on over 80 papers arising from the collaboration and P574 data. The data have contributed to the PhD theses of students from Bordeaux, Oxford, Manchester, Stanford, and Swinburne.less
Australia Telescope National Facility - P574 - Pulsar timing and the GLAST mission - Published 27 Jan 2021
We propose to continue observing the magnetars 1E 1547.0?5408 and PSR J1622?4950 weekly, to track their rotation, flux density, and polarisation. The revolutionary UWL capabilities promise new opportu... morenities 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, and of the hot-off-the-press magnetar Swift J1818.0?1607, for which our observations with the UWL receiver are providing unique and tantalizing measurements of radio spectrum and polarisation.less
Australia Telescope National Facility - P885 - Understanding the Remarkable Behaviour of Radio Magnetars - Published 27 Jan 2021
Australia Telescope National Facility - P1040 - Follow-up observations of transient events detected in the Parkes data archive - Published 27 Jan 2021
This proposal relates to time purchased by the Chinese Academy of Sciences for Parkes follow-up confirmation and timing of FAST discoveries. As the observing time has been purchased this proposal (an... mored the related PX501) does not require TAC grading. The primary reason for submitting a proposal is to ensure an outreach statement and that the proposal is entered into OPAL for the data archive to access. The Chinese team have two time requests. The time scheduled for the first, relating to this proposal, will be allocated in blocks of 24 hours and the data will become available in the data archive with an 18 month embargo period. The second type of time will be scheduled in shorter blocks and the data archived with a 10 year embargo.less
Australia Telescope National Facility - PX500 - FAST: category 1 purchased time - Published 26 Jan 2021
Intermittent pulsars are a major topic of current pulsar research as they provide a direct link between studies of pulsar emission and irregularities in the rotation of the pulsars. The new Ultra-Wide... more-Low(UWL) receiver provides unprecedented frequency coverage and will allow us to study the emission properties of the intermittent pulsars in great detail. We request observations with the UWL receiver to intermittent pulsars. These are pulsars whose emission switches on and off at long intervals from days to years. We will determine the distribution and frequency dependence of the time scales, look for weak or bursty emission in the off states and determine the bandwidth of the on/off emission process, the spectral characteristics of the emission, the evolution of pulse energy distribution over wide-band and search for possible link between long- and short-term emission variability. These observations will provide insights into how these pulsars emit and how that emission is changing in time and as a function of frequency.less
Australia Telescope National Facility - P1071 - Study of intermittent pulsars with UWL - Published 26 Jan 2021
Australia Telescope National Facility - P1038 - Wide-band observations of PSR J1759-2402 through periastron - Published 26 Jan 2021
We propose to use the Parkes UWL receiver for confirmation and monitoring a sub-set of bright FAST-discovered pulsars, especially for those discoveries located outside the sky regions covered by the p... moreurchased PX-500 project. For special FAST discoveries that already confirmed by Parkes, such as MSPs or pulsars with interesting emission properties, we propose to do long-term monitoring for them as well. These monitoring aim to solve their parameters, binary orbit, and provide significant insight into the special emission properties of these new discoveries and facilitate science. The Parkes UWL system provides a unique capability for studying the pulsars over wide bandwidths, in term of both the timing precision and frequency-dependent observing properties.less
Australia Telescope National Facility - P1092 - Confirmation and monitoring of bright FAST pulsar discoveries - Published 26 Jan 2021
Australia Telescope National Facility - P1071 - Study of intermittent pulsars with UWL - Published 25 Jan 2021
This project is to continue timing and profile studies of the first double-pulsar system, a unique laboratory for gravitational physics. Recent results, including the first measurements of higher-orde... morer light-propagation effects and of the relativistic deformation of the orbit, highlight the importance of a long term observational campaign for this remarkable system. The main aims of this proposal are to exploit the high sensitivity of the UWL receiver to provide the strongest tests to date for general relativity and to measure for the first time the moment-of-inertia of a neutron star. Additionally, we will search for the reappearance of the B pulsar.less
Australia Telescope National Facility - P455 - Timing & geodetic precession in the double pulsar and two relativistic binaries - Published 24 Jan 2021
Australia Telescope National Facility - P1032 - Mass measurements of southern binary pulsar systems - Published 24 Jan 2021
We propose to continue the timing campaign of the new millisecond pulsar, J1431-6328, discovered by the Australian SKA Pathfinder (ASKAP). PSR J1431-6328 has a spin period of 2.77 ms and is in a very ... morewide 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 stable profile and wide orbit of J1431-6328 also makes it a good candidate for pulsar timing arrays and tests of the strong equivalence principle. By the end of this semester, we plan to summarise the timing campaign with a paper and publish the timing solution, wide band polarisation properties of this pulsar and studies of the binary system.less
Australia Telescope National Facility - P1058 - Timing of the first ASKAP pulsar J1431-6328 - Published 24 Jan 2021
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 24 Jan 2021
We propose to continue our observations of PSR J1653-45, a 951-ms pulsar in a long, 1.5-yr orbit, and experiences apparent eclipses whose duration and nature have yet to be fully understood. Binary pu... morelsars are valuable objects of scientific study, allowing for a wide range of applications, including tests of gravity, probes of the neutron star equation of state, and fossil records of stellar evolution. Long spin-period pulsars in binary systems are generally much rarer than faster-spinning `recycled’ pulsars, and represent an under-explored region of pulsar binary evolution. Based upon previous Parkes proposals, our understanding of this pulsar has significantly increased. We have detected the pulsar in previously unexplored regions of its orbit, and have constrained the duration of the eclipse, such that a targeted campaign in the 2021APRS semester (during which the next eclipse is expected) will provide the breakthrough needed to solve and understand this pulsar. For the 2020OCTS semester, we propose a lower-cadence monitoring campaign, intended to allow these future observations to be successfully-phase connected with the existing dataset, maximising their scientific utility. We also propose to conduct a small set of high-cadence observations of PSR J1653-45 intended to characterise its emission and explore any short-term variability which may be inhibiting our ability to determine a timing solution. Through this, we hope to gain a greater understanding of this pulsar’s properties and how it fits into this under-explored class of unrecycled pulsar binaries.less
Australia Telescope National Facility - P1021 - Mapping the orbit of an enigmatic 1.5-yr eclipsing binary pulsar. - Published 24 Jan 2021
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 24 Jan 2021
This is a request for observing time for the timing campaign of new pulsar discoveries and follow-up of expected new potential pulsars from the re-processing of the low-latitude Galactic plane section... more of the HTRU survey (P630). We have now completed the first pass re-processing of the 62 % of the survey with GPU based coherent acceleration search and template bank search pipelines, and have discovered 51 previously unknown pulsars. Interesting science can usually only be derived from a new pulsar after confirmation and a follow-up timing campaign is carried out. One year of initial timing is the minimum timespan required to fully characterise any newly-discovered pulsars, essential for deriving pulsar parameters such as the characteristic age, magnetic field strength, spin-down rate, as well as to detect any unexpected behaviour of the pulsar which might result from emission instabilities. This timing project is necessary for following up on any interesting pulsar systems discovered from the HTRU Galactic plane survey. Since all of the pulsars on the observing list here have been confirmed in the current 2020APRS semester, the follow-up timing will produce completely new and exciting results. In addition, this timing project will enable a large-scale examination of the Galactic plane pulsar population, exploring the true boundaries of pulsar parameter space in the galactic plane.less
Australia Telescope National Facility - P1050 - Initial Follow-up of Potential Pulsar Discoveries from Re-processing of the HTRU-S LowLat Galactic Plane Survey - Published 23 Jan 2021
We propose timing observations of the relativistic pulsar - white-dwarf binary, PSR J1141$-$6545. This unique system offers access to a wide range of physics, from relativistic phenomena through pulsa... morer emission cone studies, to the structure and distribution of interstellar plasma along our line-of-sight. The Parkes Ultra Wide Band Low Frequency (UWL) receiver has opened up the possibility of performing the first-ever studies of its orbital dynamics at high temporal resolution. Our analysis of data obtained to date suggests that the pulsar will precess away from our line-of-sight before 2023. Hence, regular observations are crucial to maximize science outcomes with this source.less
Australia Telescope National Facility - P971 - Orbital dynamics and the intra-binary medium of PSR J1141-6545 - Published 23 Jan 2021
Australia Telescope National Facility - P1092 - Confirmation and monitoring of bright FAST pulsar discoveries - Published 23 Jan 2021
Australia Telescope National Facility - P1038 - Wide-band observations of PSR J1759-2402 through periastron - Published 23 Jan 2021
Globular clusters can harbour many compact objects including intermediate mass black holes and a zoo of neutron star systems. Mercer 5 is a newly identified globular cluster whose gamma-ray emission p... moreroperties suggest it may host 200 or more millisecond pulsars. If this is the case it could be the most abundant system known by some distance, opening up several avenues of study on fundamental astrophysical questions. Using the UWL receiver we propose to perform deep searches of the cluster with Parkes to identify the pulsar population.less
Australia Telescope National Facility - P1082 - Revealing Mercer 5's Pulsar Population with Parkes - Published 23 Jan 2021
Australia Telescope National Facility - P1082 - Revealing Mercer 5's Pulsar Population with Parkes - Published 22 Jan 2021
