Study of pulse jitter characteristics of PSR J1744-1134: Towards high precision pulsar timing with InPTA
Abstract
Variations in the shapes of individual pulses introduce a broadband noise component in pulsar times of arrival beyond what is expected from radiometer noise, referred to as the jitter noise. This noise limits the timing accuracy and, consequently, the sensitivity required for the detection of nanohertz gravitational waves using pulsar timing arrays. Accurate characterization of jitter noise, including its amplitude and frequency dependence, is therefore essential for each pulsar. In this work, we present the first detailed study of jitter noise in PSR J1744-1134 over the frequency range 300-500 MHz, using observations from the Indian Pulsar Timing Array experiment conducted with the upgraded Giant Metrewave Radio Telescope. We detect clear signatures of jitter in this pulsar through pulse-level analysis and Bayesian inference. Furthermore, we investigated the frequency dependence of the jitter noise and compared our results with earlier measurements at higher frequencies. The observed differences in jitter amplitude suggest a possible frequency evolution, highlighting the importance of low-frequency studies for improving pulsar timing precision and accuracy. We also investigated the effect of jitter on the high precision dispersion measure derived from our observations and found that jitter is not the limiting factor for DM precision achieved for this pulsar in the given observation timescale.
Versions
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BibTeX
@misc{jose2026study,
title = {{Study of pulse jitter characteristics of PSR J1744-1134: Towards high precision pulsar timing with InPTA}},
author = {Jibin Jose and Manoneeta Chakraborty and Neelam Dhanda Batra and K Nobleson and Shantanu Desai and Manjari Bagchi and Bhal Chandra Joshi and Keitaro Takahashi and Shaswata Chowdhury and Churchil Dwivedi and Abhimanyu Susobhanan and Debabrata Deb and Sushovan Mondal and Zenia Zuraiq and Kaustubh Rai and Sharika Dhakappa and Pratik Tarafdar and Kuldeep Meena},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.20848},
eprint = {2610.20848},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.20848},
note = {CC0},
}
RIS
TY - UNPB
TI - Study of pulse jitter characteristics of PSR J1744-1134: Towards high precision pulsar timing with InPTA
AU - Jibin Jose
AU - Manoneeta Chakraborty
AU - Neelam Dhanda Batra
AU - K Nobleson
AU - Shantanu Desai
AU - Manjari Bagchi
AU - Bhal Chandra Joshi
AU - Keitaro Takahashi
AU - Shaswata Chowdhury
AU - Churchil Dwivedi
AU - Abhimanyu Susobhanan
AU - Debabrata Deb
AU - Sushovan Mondal
AU - Zenia Zuraiq
AU - Kaustubh Rai
AU - Sharika Dhakappa
AU - Pratik Tarafdar
AU - Kuldeep Meena
PY - 2026
DA - 2026/10/14
PB - arXiv
DO - 10.48550/arxiv.2610.20848
UR - https://arxiv.org/abs/2610.20848
AB - Variations in the shapes of individual pulses introduce a broadband noise component in pulsar times of arrival beyond what is expected from radiometer noise, referred to as the jitter noise. This noise limits the timing accuracy and, consequently, the sensitivity required for the detection of nanohertz gravitational waves using pulsar timing arrays. Accurate characterization of jitter noise, including its amplitude and frequency dependence, is therefore essential for each pulsar. In this work, we present the first detailed study of jitter noise in PSR J1744-1134 over the frequency range 300-500 MHz, using observations from the Indian Pulsar Timing Array experiment conducted with the upgraded Giant Metrewave Radio Telescope. We detect clear signatures of jitter in this pulsar through pulse-level analysis and Bayesian inference. Furthermore, we investigated the frequency dependence of the jitter noise and compared our results with earlier measurements at higher frequencies. The observed differences in jitter amplitude suggest a possible frequency evolution, highlighting the importance of low-frequency studies for improving pulsar timing precision and accuracy. We also investigated the effect of jitter on the high precision dispersion measure derived from our observations and found that jitter is not the limiting factor for DM precision achieved for this pulsar in the given observation timescale.
ER -