{"dataCollectionTypeCode":"ENCAPSULATED_PULSAR","id":{"identifierType":"Fedora PID","identifier":"csiro:53744"},"dataCollectionId":53744,"dataCollectionCommonId":53744,"versionNumber":1,"dataVersionNumber":1,"self":"https://data.csiro.au/dap/ws/v2/collections/53744","landingPage":{"relationship":"alternate","mediaType":"text/html","href":"https://data.csiro.au/collection/csiro:53744","fileUpload":false,"fileId":0},"title":"Parkes observations for project P1021 semester 2021OCTS_04","description":"We propose to continue our observations of PSR J1653-45 and PSR J1812-15, a pair of long spin-period binary pulsars which both show degrees of orbitally-dependent variability. Binary pulsars are valuable objects of scientific study, allowing for multiple 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. This is particularly true of PSR J1812-15, for which only one other pulsar (B1718-19) seems remotely comparable.\r\n\r\nBased upon previous Parkes proposals, our understanding of these pulsars and their place with binary evolution has significantly increased, such that we anticipate their publication in early 2022. We therefore propose a low-cadence campaign intended to finalise the timing of both pulsars. For PSR J1812-15, this data will be useful in addressing on-going problems with phase connection, which may be caused by an undiagnosed glitch or other un-modeled timing effect. For PSR J1653-45, this data will be useful in both capitalising on the breakthroughs of the 2021APRS campaign (detection of the pulsar during its eclipse phase) and in setting up a future eclipse campaign should it be deemed of sufficient scientific merit. These observations are the final step needed to ensure the publication of these pulsars in the immediate term.","legacyId":null,"fieldsOfResearch":["Astronomical sciences not elsewhere classified"],"dataStartDate":"2021-10-01","dataEndDate":"2022-03-31","keywords":"pulsars, neutron stars","licence":"Creative Commons Attribution 4.0 International Licence","licenceLink":{"relationship":"licence","mediaType":"text/html","href":"https://data.csiro.au/dap/ws/v2/licences/1121","fileUpload":false,"fileId":0},"organisations":["CSIRO (Australia)"],"attributionStatement":"Cameron, Andrew; Possenti, Andrea; Johnston, Simon; Kramer, Michael; Bailes, Matthew; Stappers, Benjamin; Champion, David; Kaczmarek, Jane; Madrid, Juan; Balakrishnan, Vishnu; & Freeburn, James (2021): Parkes observations for project P1021 semester 2021OCTS_04. v1. CSIRO. Data Collection. https://doi.org/10.25919/zk6n-3b35","rights":"All Rights (including copyright) CSIRO 2021.","access":"The metadata and files (if any) are available to the public.","published":"2022-01-31T08:12:15.916+11:00","leadResearcher":"Andrew Cameron","versions":"https://data.csiro.au/dap/ws/v2/collections/53744/versions","metadata":"https://data.csiro.au/dap/ws/v2/collections/53744/metadata","data":"https://data.csiro.au/dap/ws/v2/collections/53744/data","serviceCount":0,"supportingFiles":"https://data.csiro.au/dap/ws/v2/collections/53744/support","contributors":["Andrea Possenti","Simon Johnston","Michael Kramer","Matthew Bailes","Benjamin Stappers","David Champion","Jane Kaczmarek","Juan Madrid","Vishnu Balakrishnan","James Freeburn"],"allNames":[{"name":"Cameron, Andrew","display":"Andrew Cameron","orcidId":null,"type":"Person","orgInfo":"Swinburne University of Technology, Australia"},{"name":"Possenti, Andrea","display":"Andrea Possenti","orcidId":null,"type":"Person","orgInfo":"Osservatorio Astronomico di Cagliari (INAF), Italy"},{"name":"Johnston, Simon","display":"Simon Johnston","orcidId":null,"type":"Person","orgInfo":"CSIRO Australia Telescope National Facility, Australia"},{"name":"Kramer, Michael","display":"Michael Kramer","orcidId":null,"type":"Person","orgInfo":"Max Planck Inst. fuer Radioastronomie, Bonn, Germany"},{"name":"Bailes, Matthew","display":"Matthew Bailes","orcidId":null,"type":"Person","orgInfo":"Swinburne University of Technology, Australia"},{"name":"Stappers, Benjamin","display":"Benjamin Stappers","orcidId":null,"type":"Person","orgInfo":"Jodrell Bank Centre for Astrophysics, United Kingdom"},{"name":"Champion, David","display":"David Champion","orcidId":null,"type":"Person","orgInfo":"Max Planck Inst. fuer Radioastronomie, Bonn, Germany"},{"name":"Kaczmarek, Jane","display":"Jane Kaczmarek","orcidId":"0000-0003-4810-7803","type":"Person","orgInfo":"CSIRO Space and Astronomy, Australia"},{"name":"Madrid, Juan","display":"Juan Madrid","orcidId":null,"type":"Person","orgInfo":"CSIRO Australia Telescope National Facility, Australia"},{"name":"Balakrishnan, Vishnu","display":"Vishnu Balakrishnan","orcidId":null,"type":"Person","orgInfo":"Max Planck Inst. fuer Radioastronomie, Bonn, Germany"},{"name":"Freeburn, James","display":"James Freeburn","orcidId":null,"type":"Person","orgInfo":"University of Queensland, Australia"}],"activity":{"activityId":12548,"activityTitle":"P1021 - Mapping the orbit of an enigmatic 1.5-yr eclipsing binary pulsar.","activityType":"Observation","activityDescription":"Pulsars (rapidly-rotating, highly-magnetised neutron stars) are fascinating celestial objects, with pulsars in binary systems (about 11% of all known pulsars) being of particular interest. The study of binary pulsars can reveal information about how stars evolve over cosmological timescales, can provide extreme laboratories for testing gravitational theories like General Relativity, or can be used to probe the inner structure of neutron stars. The overwhelming majority of binary pulsars are among the fastest-spinning pulsars, with rotational periods of less than 30 milliseconds. Meanwhile, binary pulsars with longer spin periods (such as the one we are currently observing) are relatively rare, and present questions as to the process by which their binary systems have evolved.\r\nThis project aims to study one particular binary pulsar, PSR J1653-45. This pulsar has a long spin period of 951 milliseconds and a long orbital period of 1.5 years. This pulsar also experiences `eclipses’, where it appears to vanish as it passes behind its binary companion. Unusually however, these eclipses last for nearly half of the orbit, and have prevented us from determining the true shape of the pulsar’s orbit. Our observations are designed to learn as much as possible about the pulsar as it enters its eclipse, to try and determine exactly what is causing the eclipse to occur (and why the pulsar appears to vanish for so long), as well as to track the pulsar’s orbit for as possible before it becomes hidden from us once again.","activityInstrument":"Parkes"},"domainType":"ATNF","collectionContentType":"Data","andsPid":"102.100.100/435463","doi":"10.25919/zk6n-3b35","project":{"irpHierarchy":false,"projectTitle":"Australia Telescope National Facility"},"nationalFacility":"Australia Telescope National Facility","nationalCollection":"Australia Telescope National Facility","organisationalLevels":{"irpHierarchy":true,"businessUnit":"SPACE AND ASTRONOMY","team":"NSW Observatory Operations","program":"Australia Telescope National Facility","group":"ATNF Operations"},"accessLevel":"Public","dataRestricted":"FALSE","voResource":{"ivoIdentifier":"ivo://au.csiro.atnf/P1021-2021OCTS_04"},"depositStatus":"P","accessViewable":false,"withdrawn":false,"blocked":false,"askapLevel7":false,"permaLink":"https://doi.org/10.25919/zk6n-3b35","selfLink":"https://data.csiro.au/collection/csiro:53744","templateCollection":false}