AndreaBozzo/ceres-open-data-index huggingface dataset:
Parkes observations for project P1382 semester 2025OCTS_01

The prevalence of millisecond pulsars (MSPs) in and around the Galactic center and the bulge has been one of the key questions in pulsar astronomy. In addition to finding more exotic and interesting binary systems at and around the Galactic center and bulge due to the enhanced density of stars/stellar remnants, MSPs are also proposed to be one of the candidates to explain the observed Fermi gamma-ray excess. However, most of the MSPs discovered so far are field (disk) MSPs or those in globular clusters. Initial steps towards addressing the question of Galactic center/bulge MSPs were made with the discovery of the first MSPs in a Galactic filament, but more progress comes from the discovery of a sample of MSPs around the Galactic center. Blind surveys targeting MSPs can suffer from many observational biases that smear the pulses due to binary acceleration, scattering from the enhanced density, and so on, which increases the parameter space for discovery and can sometimes make the problem intractable. However, if pulsar candidates can be identified reliably from imaging surveys, then targeted observations can make the problem tractable in identifying the pulsations. We followed up a sample of polarized sources identified in the MeerKAT bulge imaging survey and discovered a sample of 16 new MSPs. Here we request the timing observations of 8 interesting MSPs (a subset of our discovery sample), to study the binary nature of these sources and their potential inclusion in pulsar timing array efforts.

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Parkes observations for project PX500 semester 2025OCTS_01

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 (and 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.

Organization: CSIRO Data Access Portal
Parkes observations for project P1365 semester 2025OCTS_01

Following the successful demonstration of a pilot first-pass (shallow) search of a small fraction of the sky, the second-pass processing has commenced for the SMART pulsar survey, which involves deep searches of 80-minute observations. The processing over the past year has led to the discovery of 11 new pulsars (including two millisecond ones), thus tripling the initial count from the first pass, and hinting at the exciting promise of this first southern-sky pulsar survey in the frequency band of SKA-Low.  All new pulsars need to be timed in order to determine their spin and astrometric parameters and to select specialised targets for detailed follow-ups. With the MWA no longer supporting routine pulsar observations for the coming year, timing follow-ups rely on other telescopes. The Parkes \emph{Murriyang} telescope, with an identical sky coverage, sensitivity and the wide frequency coverage, offers the best option to time SMART discoveries. We have demonstrated \emph{Murriyang's} suitability for this through a pilot project last semester and are now extending the project to a larger sample of 10 pulsars including two from the pilot project. The data will also allow us to study pulse profiles, polarisation, and flux densities from $\sim$100 MHz to 4 GHz. The analysis/results will be included in a publication in preparation that will detail the deep-search pipeline and report on initial pulsar discoveries.

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Long-term project observations for project P1101 semester 2025APRS_10

We propose a long-term project to monitor a very active repeater, FRB 20190520B, with Murriyang's UWL system. Our previous observations show that FRB 20190520B is not only among the most active FRBs that can be observed with Murriyang, but also shows extreme rotation measure (RM) and dispersion measure (DM) evolution, along with distinctive behavior at 3GHz frequency. This makes the UWL receiver uniquely suited for detailed studies and long-term monitoring of this repeating FRB. Through this program, we anticipate detecting a large sample of bursts from this FRB. In collaboration with FAST, we aim to investigate the time evolution of various properties of FRB 20190520B, enhance our understanding of polarisation across an extremely wide bandwidth with high sensitivity, and gain deeper insights into the local environment and emission mechanisms of FRBs.

Organization: CSIRO Data Access Portal
Parkes observations for project P1054 semester 2025OCTS_01

With this proposal we ask time to continue our timing follow-up campaign of pulsars discovered with the MeerKAT telescope. Fourtyfour sources have been discovered in targeted observations of Fermi unidentified point sources, two towards Supernova Remnants, 26 in the Magellanic Clouds, 106 in Globular Clusters and 87 in a survey of the Galactic plane. A large fraction of the new discoveries are recycled pulsars (including a few relativistic systems, a pulsar with a planetary companion and  several 'spider' binaries), or young pulsars. Timing observations have an essential role in exploiting the full potential of any pulsar discovery, allowing for the precise measurement of rotational, astrometric and orbital parameters which, in turn, give us powerful tools to improve our understanding of the physics in extreme environments as well as of the population of neutron stars as a whole. The UWL receiver of the Parkes telescope is a sensitive, versatile instrument that is allowing us to successfully time these new sources, in the bright-end of TRAPUM discoveries.

Organization: CSIRO Data Access Portal
Parkes observations for project P1165 semester 2025OCTS_01

We recently discovered two new pulsars J1849+1001 (35.1 ms) and J1839+0543 (57.9 ms) in a FAST pulsar survey at intermediate Galactic latitudes (PT2020_0141). Follow-up timing observations show that they are in circular orbits with massive companions. This suggests that PSR J1849+1001 and J1839+0543 can be classified as the intermediate-mass binary pulsar (IMBP). Their massive companions also make them promising systems to measure "Post-Keplerian" parameters through pulsar timing. These Parkes observations will be combined with regular timing observations with FAST or MeerKAT to measure "Post-Keplerian" parameters and then measure both neutron star and companion masses.

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Parkes observations for project P1349 semester 2025APRS_08

We propose an investigation of pulsars with interpulse (IP) emissions using the Ultra-wide-bandwidth Low (UWL) receiver at the Parkes (Murriyang) telescope. We aim to explore the polarization and emission properties of these pulsars through the application of the rotating vector model (RVM). Polarization profiles will be obtained across a wide bandwidth spanning 704 MHz to 4032 MHz. Emission heights will be measured using both the delay-radius and geometrical
  methods to examine their frequency dependence and test the radius-to-frequency mapping (RFM) model. Spectral analyses of different profile components will be conducted to constrain pulsar emission properties, while pulse intensity modulations will be analyzed to identify potential phase-lock phenomena. Our study will provide more information on the understanding of the properties of pulsars with IP emissions.

Organization: CSIRO Data Access Portal
Parkes observations for project P1054 semester 2025APRS_21

With this proposal we ask time to continue our timing follow-up campaign of pulsars discovered with the MeerKAT telescope. Fourtytwo sources have been discovered in targeted observations of Fermi unidentified point sources, two towards Supernova Remnants, 19 in the Magellanic Clouds, 105 in Globular Clusters and 81 in a survey of the Galactic plane. A large fraction of the new discoveries are recycled pulsars (including a few relativistic systems and several 'spider' binaries), or young pulsars. Timing observations have an essential role in exploiting the full potential of any pulsar discovery, allowing for the precise measurement of rotational, astrometric and orbital parameters which, in turn, give us powerful tools to improve our understanding of the physics in extreme environments as well as of the population of neutron stars as a whole. The UWL receiver of the Parkes telescope is a sensitive, versatile instrument that is allowing us to successfully time these new sources, in the bright-end of TRAPUM discoveries.

Organization: CSIRO Data Access Portal
Parkes observations for project P1357 semester 2025APRS_12

MeerKAT has already discovered a number of Galactic transients, which are most likely to be Rotating Radio Transients (RRATs). Previous observations of a few of these sources with the Parkes UWL receiver have proven its utility in follow-up timing observations of MeerKAT discoveries.
  MeerKAT has discovered a few more RRATs in its latest observing cycle and more good quality UWL observations of these sources are required to determine the rotational period and period derivative and also to facilitate the study of their emission properties. Therefore, we request follow-up observations of 5 new sources to achieve this and to further enable spectral and polarization studies of these sources. Given the potential link between RRATs, magnetars, and some fast radio bursts (FRBs) suggested by both observations and theories, this study could reveal more similarities between these different classes of transient sources and significantly advance our understanding of their origins.

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Long-term project observations for project P1321 semester 2025APRS_24

The atomic interstellar medium shows tiny-scale optical depth fluctuations on the scale of 0.1~10,000 AU, whose origin and nature are poorly understood. The existence of this Tiny-Scale Atomic Structure (TSAS) has significant implications, potentially calling into question our fundamental understanding of heating, cooling and dynamical processes in the interstellar medium. Yet observations remain sparse. This long-term project plans to search for temporal variations in HI absorption spectra seen against background pulsars to characterise TSAS in the Milky Way interstellar medium (ISM). These observations constitute the largest number of sightlines and densest temporal sampling ever performed in a single experiment, and will test predictions that TSAS is the tail end of a turbulent cascade, constrain its minimum size scale (down to resolutions of ~0.05 AU) and potentially provide the first direct measurements of pressures in "large" TSAS features of &gt; 1000 AU. We make use of the phase-resolved spectral line mode that we have recently implemented on Parkes, which has cut data rates and processing times by factors of ~1000 compared to past studies. This is an expansion of our pilot P1321 to a long term study.

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Long-term project observations for project P885 semester 2025APRS_14

We propose a modest program to continue monitoring 4 of the 6 known radio magnetars in order to achieve three primary science goals. The first is to characterise magnetar outbursts over long timescales, for which tracking their rotational, flux density, and polarisation properties provide a clear view of the impulse response of their magnetic fields. Second, understanding the links between magnetars the mysterious fast radio burst phenomenon through the discovery of rare emission and propagation effects, shared spectro-temporal phenomenology, and connections to high-energy (X-ray/gamma-ray) phenomena. Lastly, our continued monitoring has enormous benefit to the wider magnetar community, providing rapid alerts to changes in activity, adding context to unusual behaviour detected by high-enery observations, and a host of supplementary science through the teams extensive collaborative networks. The project and its precursors have been running since 2007 and have contributed to 21 publications since then. We are seeking to convert the project to long-term status, thereby also carrying these investigations into the SKA era.

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Parkes observations for project P960 semester 2025APRS_14

We aim to carry out receiver pointing and characterisation tests of Parkes receivers. Typically, these tests are carried out after the receiver package is installed, but time does not always allow for proper characterisation. Receivers for consideration include UWL, MARS and 13MM packages. In addition to cross-referencing C007 for flux calibration via pointing, we aim to conduct gain-elevation and system temperature experiments using the Moon, to ensure users of the Parkes Observatory have the most accurate information available for calibration purposes.

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Parkes observations for project P1032 semester 2025APRS_06

With this proposal, we aim to continue P1032, the rapid measurements of relativistic parameters of southern binary pulsar systems using data from the Parkes Ultra Wideband Low (UWL) receiver. As the MeerTime project at the MeerKAT radio telescope ended in early 2024, observations with the UWL receiver now form the backbone for extending the timing baselines of many pulsars that have been part of this project. Since the source selection in APRS2024 was tailored such that the UWL receiver is the most (versatile and) suited instrument to achieve the proposed scientific goals for the chosen pulsars, we propose to continue these observations. We will use the UWL data to obtain significant orbital coverage and timing baselines on these pulsars and obtain important constraints on orbital and temporal DM variations that will help in identifying the nature of the companion stars. Increasing the number of measured Neutron Star (NS) masses, as well as improving on current constraints has profound implications for NS internal structure and for stellar and binary evolution physics. We request pre-graded status for this project for the next semester.

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Parkes observations for project P1321 semester 2024APRS_08

We propose to search for temporal variations in HI absorption spectra seen against background pulsars to characterise Tiny Scale Atomic Structure (TSAS) in the Milky Way interstellar medium (ISM). We will re-observe seven previously studied bright pulsars at two observing epochs in this semester, resulting in minimum and maximum experimental baselines of 0.25 and 50 years. These observations will test predictions that there is a minimum size scale set by the thermal and turbulent properties of the ISM, below which TSAS is only sporadically seen, and will potentially provide the first direct measurements of pressures in "large" TSAS features of &gt; 1000 AU.  By using a new phase-resolved spectral line mode that we have recently implemented on Parkes, we will cut data rates and processing times by factors of ~1000. Following the success of this pilot project, we plan to expand to a long-term monitoring programme. Successful demonstration of our techniques will lay the groundwork for future programmes on the SKA.

Organization: CSIRO Data Access Portal
Parkes observations for project P1330 semester 2025APRS_02

We discovered PSR J1716-2808A (NGC6316A), a highly accelerated binary millisecond pulsar (MSP), in the globular cluster NGC6316. We previously used Parkes to solve the orbit of this MSP and are currently timing it (P1330). We have five scheduled observations remaining in the OCT2024 semester. The goal of the proposed observations is to establish a year and a half long timing campaign with at least a year of monthly cadence observations. This is crucial to break the timing degeneracy that occurs between the pulsar's position and the pulsar's spindown rate. We will be able to use this to connect the pulsar to our previous observations spanning back to 2022, thereby creating a three year timing baseline. A secondary advantage of having these observations is that the data can also be used time any new pulsars that are discovered in any subsequent observations.

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Parkes observations for project P1328 semester 2025APRS_19

Fast radio bursts are peculiar micro-millisecond duration transients, which have been seen to be extragalactic in origin. Since their discovery, a dichotomy has emerged in their population. Some FRBs have been seen to be repeating, while others have not been seen to be repeating. The repeating FRBs, such as FRB 20180301A, provide an unparalleled window into their circumburst environment due to their repeating nature, which can be used to constrain possible progenitor models and test underlying emission mechanisms. Additionally, FRB 20180301A has been seen to have interesting polarisation properties, such as a switch in the sign of RM, indicating a reversal in the magnetic field and a marked reduction in the linear polarisation fraction towards lower frequencies (depolarisation). The previous Parkes/Murriyang source follow-up has also revealed a temporal evolution in the dispersion measure (DM) of the source and tentative evidence for correlation in the DM and rotation measure (RM). The ultra-wideband low (UWL) receiver on Parkes/Murriyang is ideally suited to explore the wideband spectro-temporal and polarimetric behaviour of the source. We propose regular monitoring of FRB 20180301A using UWL to model the magnetic field evolution, study its circumburst media using depolarisation behaviour, and constrain any correlation of DM and RM.

Organization: CSIRO Data Access Portal
Parkes observations for project P1343 semester 2025APRS_10

Fast radio bursts (FRBs) are millisecond-duration radio bursts of extragalactic origin. Since the discovery of the first FRB in the archival Parkes/Murriyang multibeam data, a broad dichotomy in population has emerged. Some FRBs have been seen to be repeating, while others are not, despite a significant amount of follow-up using different radio telescopes. The commissioning of new dedicated FRB detection systems has led to an exponential increase in the detected FRBs over the last decade. Despite &gt;700 FRBs published to date, there is still a lack of understanding about the physical mechanisms through which FRB emission is produced. Due to the possibility of detecting multiple bursts from the same source in a repeating FRB, it forms an ideal sample set to uncover the physics of the source (e.g., emission mechanism, progenitor surrounding media), and test possible progenitor models. The coherent upgrade to the FRB detection system to ASKAP is expected to detect ~1-2 FRB/week. However, due to the limited fractional bandwidth available with ASKAP and survey nature of the telescope, probing the spectro-polarimetric characteristics of repeating sources is non-optimal. Hence, the large bandwidth offered by the ultra wideband-low (UWL) on Parkes/Murriyang is an ideal instrument to follow-up repeating FRB sources discovered through CRACO. Over the next ~6 months, we expect to double the number of repeaters that have been studied through the UWL. This will provide unprecedented insight into the progenitor environment and the surrounding media of repeating FRBs. We propose using the UWL to follow up repeater-like sources to study their wideband spectro-polarimetric characteristics.

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Parkes observations for project P1211 semester 2024APRS_27

Traditional pulsar searching techniques are not sensitive enough to extreme pulsars such as millisecond pulsars (MSPs) in compact binaries (e.g., Pulsar-Blackhole binary systems), extremely fast spinning pulsars (e.g., sub-MSPs), and high dispersion measure (DM) pulsars. Such a situation is now changed thanks to the development of next generation radio telescope arrays such as Australian Square Kilometer Array Pathfinder (ASKAP). ASKAP is capable of conducting highly sensitive radio continuum surveys with wide sky coverage (e.g, Evolutionary Map of The Universe survey). One of the solutions is to find pulsar candidates in radio continuum surveys such as ASKAP surveys and then carry out targeted searches. This technique allows us to search over the wide bandwidth with full field of view while avoiding the need for expensive pixel-by-pixel high time resolution searches. In this proposal, we propose to observe 16 pulsar candidates identified in the Galactic plane using new ASKAP EMU images. We found 22 candidates by selecting sources with spectral index steeper than -2.0 and compactness less than 1.2. Among them 13 are known pulsars and a reasonable number of candidates to follow up (9 sources). In total, we have 16 candidates including seven sources from 2023APRS semester. Because of the dense ionised medium in the Galactic Plane, MSPs are likely to be missed by previous pulsar surveys carried out at 1.4 GHz. Here, we propose a targeted pulsar search with the Parkes UWL which allow us to search pulsation at higher frequencies and therefore avoid strong DM smearing and scattering effects.

Organization: CSIRO Data Access Portal
Long-term project observations for project P1321 semester 2025APRS_23

The atomic interstellar medium shows tiny-scale optical depth fluctuations on the scale of 0.1~10,000 AU, whose origin and nature are poorly understood. The existence of this Tiny-Scale Atomic Structure (TSAS) has significant implications, potentially calling into question our fundamental understanding of heating, cooling and dynamical processes in the interstellar medium. Yet observations remain sparse. This long-term project plans to search for temporal variations in HI absorption spectra seen against background pulsars to characterise TSAS in the Milky Way interstellar medium (ISM). These observations constitute the largest number of sightlines and densest temporal sampling ever performed in a single experiment, and will test predictions that TSAS is the tail end of a turbulent cascade, constrain its minimum size scale (down to resolutions of ~0.05 AU) and potentially provide the first direct measurements of pressures in "large" TSAS features of &gt; 1000 AU. We make use of the phase-resolved spectral line mode that we have recently implemented on Parkes, which has cut data rates and processing times by factors of ~1000 compared to past studies. This is an expansion of our pilot P1321 to a long term study.

Organization: CSIRO Data Access Portal