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Parkes observations for project P1021 semester 2020APRS_05
We propose to continue our observations of PSR J1653-45, a 951-ms pulsar in a long, 1.5-yr orbit. Binary pulsars 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 sy... morestems are generally much rarer than faster-spinning `recycled’ pulsars, and represent an under-explored region of pulsar binary evolution.
In addition to its long orbital period, PSR J1653-45 also experiences extended eclipses, lasting up to half of the orbital period and whose nature is not well understood. These eclipses have also prevented the determination of an orbital or phase-connected timing solution, both vital steps in allowing for the continued study of this system. We propose a targeted, high-cadence observing campaign designed to monitor this pulsar as it transitions out of its eclipsing state. The campaign has the twin goals of both monitoring how the eclipse affects the pulsar’s emission properties, thereby revealed more about the nature of the eclipses themselves, and of extracting as much information regarding the pulsar’s orbit during its least-explored regions, thereby constrained and hopefully solving the pulsar’s orbit and ideally leading to the development of a timing solution. In both instances, 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
Astronomical and Space Sciences not elsewhere classified
01 Apr 2020
30 Sep 2020
Creative Commons Attribution 4.0 International Licence
Cameron, Andrew; Possenti, Andrea; Johnston, Simon; Kramer, Michael; Bailes, Matthew; Stappers, Benjamin; Champion, David; Kaczmarek, Jane; Balakrishnan, Vishnu; Freeburn, James (2020): Parkes observations for project P1021 semester 2020APRS_05. v1. CSIRO. Data Collection.
All Rights (including copyright) CSIRO 2020.
Access to this collection's metadata and/or files (if any) are restricted until 30 Mar 2022.
Australia Telescope National Facility
P1021 - Mapping the orbit of an enigmatic 1.5-yr eclipsing binary pulsar.
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 gravitationa... morel 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.
This 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. less