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Parkes observations for project P1005 semester 2019APRS_02
We propose to conduct observations of PSRs J1812-15 and J1831-04, a pair of 1-s pulsars which exhibit both nulling behaviour and clear evidence of acceleration, suggesting that they are in binary systems. Binary pulsars are valuable objects of scientific study, allowing for a wide range of applications, including tests of gravity, probes of the neu... moretron 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.
Due to the nulling behaviour of both PSRs J1812-15 and J1831-04, determination of an orbital or phase-connected solution has so far proved impossible, but both of these steps are vital in allowing for their continued study. We propose a targeted, high-cadence observing campaign designed to map the orbits of these pulsars while simultaneously factoring in the redundancy required in order to overcome their nulling behaviour. By studying these pulsars, we hope to provide new insight into an unusual class of pulsar binary, as well to constrain the nulling properties of both pulsars. less
Astronomical and Space Sciences not elsewhere classified
01 Apr 2019
30 Sep 2019
Creative Commons Attribution 4.0 International Licence
Cameron, Andrew; Possenti, Andrea; Johnston, Simon; Kramer, Michael; Bailes, Matthew; Stappers, Benjamin; Champion, David; Balakrishnan, Vishnu (2019): Parkes observations for project P1005 semester 2019APRS_02. v1. CSIRO. Data Collection.
All Rights (including copyright) CSIRO 2019.
Access to this collection's metadata and/or files (if any) are restricted until 30 Mar 2021.
Australia Telescope National Facility
P1005 - Mapping the orbits of two nulling, long spin-period pulsars
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 ms. Meanwhile, binary pulsars with longer spin periods are relatively rare, and present questions as to the process by which their binary systems have evolved.
This project aims to study two unusual pulsars with 1-second spin periods, both of which appear to be in binary systems. The first step will be to determine the orbital parameters of binary systems, e.g. how long their orbit lasts, and how non-circular it is. This process is complicated by the fact that both of these pulsars appear to “null” (i.e. their radio emission turns “on” and “off” unpredictably), requiring an intense observing campaign in order to catch them when they are turned “on”. By determining these orbital solutions, we aim to learn more about these rare binary systems, including how they originated and how their behaviour fits into the overall population of pulsars. less
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