Interplanetary scintillation-informed heliospheric modelling for the MeerKAT Pulsar Timing Array 4.5 yr dataset

arXiv:2607.09004 · astro-ph.HE, astro-ph.SR, gr-qc · Submitted 2026-07-10 · Read on arXiv

Saurav Mishra, Daniel J. Reardon, Andrew Zic, Matthew Bailes, John Morgan, Atharva D. Kulkarni, Matthew T. Miles, Ryan M. Shannon, Caterina Tiburzi, Mark Cheung, Michael Kramer, Ruoyao Ni

astro-ph.HE, astro-ph.SR, gr-qc

Submitted: 2026-07-10

Comments: 14 pages, 9 figures

Code: https://github.com/nanograv/enterprise_extensions

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Solar Wind — 8× in this paper
• pulsar timing arrays — 2× in this paper · explained in 2 episodes
• Accuracy — 1× in this paper · explained in 1 episode
• Anti-correlation — 1× in this paper · explained in 3 episodes
• Bayesian Inference — 1× in this paper · explained in 5 episodes
• Consistency — 1× in this paper · explained in 3 episodes

Sources

• The International Pulsar Timing Array checklist for the detection of nanohertz gravitational waves
• Beyond diagonal approximations: improved covariance modeling for pulsar timing array data analysis
• The NANOGrav 12.5-year Data Set: Chromatic Noise Characterization & Mitigation with Time-Domain Kernels
• Pulsar timing methods for evaluating dispersion measure time series
• Dispersion measure: Confusion, Constants & Clarity
• An insight into chromatic behaviour of jitter in pulsars and its modelling: A case study of PSR J0437$-$4715
• A Gaussian-processes approach to fitting for time-variable spherical solar wind in pulsar timing data
• A Practical Theorem on Gravitational Wave Backgrounds
• The SKAO Pulsar Timing Array
• The Nanohertz Gravitational Wave Astronomer
• Exploring Galactic plasma with pulsars in the SKA era
• Latitudinal dependence of the solar wind during periods of high and low activity through interplanetary scintillation
• Earth-affecting Solar Transients: A Review of Progresses in Solar Cycle 24
• The Parkes Pulsar Timing Array Third Data Release

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