The Indian Pulsar Timing Array Data Release 2: II. Customised Single-Pulsar Noise Analysis and Noise Budget
K. Nobleson, Churchil Dwivedi, Shantanu Desai, Bhal Chandra Joshi, Himanshu Grover, Debabrata Deb, Vaishnavi Vyasraj, Kunjal Vara, Hemanga Tahbildar, Abhimanyu Susobhanan, Mayuresh Surnis, Aman Srivastava, Shubhit Sardana, Keitaro Takahashi, Amarnath, P. Arumugam, Manjari Bagchi

TL;DR
This paper performs detailed noise analysis on 27 pulsars from the Indian Pulsar Timing Array's second data release, modeling stochastic noise sources and estimating the noise budget using Bayesian methods, revealing insights into noise characteristics and potential biases.
Contribution
It introduces a customized Bayesian noise modeling approach for individual pulsars in InPTA-DR2, improving noise characterization and identifying biases from solar-wind effects.
Findings
All 11 pulsars with <2.5 yr baseline show Gaussian residuals.
Some pulsars exhibit complex red noise models, including achromatic and chromatic noise.
Extended data baseline improves constraints on noise processes.
Abstract
We present the results of customised single-pulsar noise analysis of 27 millisecond pulsars from the second data release of the Indian Pulsar Timing Array (InPTA-DR2). We model various stochastic noise sources present in the dataset using stationary Gaussian processes and estimate the noise budget of the InPTA-DR2 using Bayesian inference, involving model selection, Fourier harmonics selection, and parameter estimation for each pulsar. We check the efficacy of our noise characterisation by performing the Anderson-Darling test for Gaussianity on the noise-subtracted residuals. We find that all 11 pulsars with time baseline show Gaussian residuals and do not have evidence for any red noise process in the optimal model, except for PSR J19440907, which shows presence of DM noise. PSRs J04374715, J19093744 and J19392134 show preference for the most…
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Taxonomy
TopicsPulsars and Gravitational Waves Research · Scientific Research and Discoveries · Astronomy and Astrophysical Research
