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publications
Solving post-Newtonian accurate Kepler equation
Published in Physical Review D, 2017
An analytic solution for the third post-Newtonian-accurate Kepler equation associated with the motion of relativistic binaries and a post-circular approximation of their gravitational waveform.
Recommended citation: Boetzel A, et al. (2017). "Solving post-Newtonian accurate Kepler equation." PRD. 96 044011. https://doi.org/10.1103/PhysRevD.96.044011
Exploring the effect of periastron advance in small-eccentricity binary pulsars
Published in Monthly Notices of the Royal Astronomical Society, 2018
An investigation of the effects and measurability of the advance of periapsis, arising due to relativistic and tidal effects, in nearly circular pulsar binaries.
Recommended citation: Susobhanan A, et al. (2018). "Exploring the effect of periastron advance in small-eccentricity binary pulsars." MNRAS. 480(4) 5260–5271. https://doi.org/10.1093/mnras/sty2177
Pulsar timing array signals induced by black hole binaries in relativistic eccentric orbits
Published in Physical Review D, 2020
An efficient method to compute PTA signals due to supermassive eccentric binaries based on an analytic solution to their leading-order relativistic orbital evolution.
Recommended citation: Susobhanan A, et al. (2020). "Pulsar timing array signals induced by black hole binaries in relativistic eccentric orbits." PRD. 101 043022. https://doi.org/10.1103/PhysRevD.101.043022
Explaining temporal variations in the jet position angle of blazar OJ 287 using its binary black hole central engine model
Published in Monthly Notices of the Royal Astronomical Society, 2021
Interpretation of the radio jet position angle variations observed in the blazar OJ 287 using a binary black hole central engine model informed by its optical observations, comparing two possible mechanisms.
Recommended citation: Dey L, et al. (2021); "Explaining temporal variations in the jet position angle of blazar OJ 287 using its binary black hole central engine model." MNRAS. 503(3) 4400–4412. https://doi.org/10.1093/mnras/stab730
pinta: The uGMRT data processing pipeline for the Indian Pulsar Timing Array
Published in Publications of the Astronomical Society of Australia, 2021
A data reduction pipeline for the GMRT pulsar observations. This is used as the starting point for all InPTA analyses and is deployed as an observatory pipeline at GMRT.
Recommended citation: Susobhanan A, et al. (2021). "pinta: The uGMRT data processing pipeline for the Indian Pulsar Timing Array." PASA. 38 e017. https://doi.org/10.1017/pasa.2021.12
Evidence for profile changes in PSR J1713+0747 using the uGMRT
Published in Monthly Notices of the Royal Astronomical Society: Letters, 2021
Investigation of a rare event where the pulse profile of the millisecond pulsar J1713+0747 underwent an abrupt radio frequency-dependent shape change followed by a gradual relaxation toward its original state, using GMRT observations.
Recommended citation: Singha J, et al. (2021); "Evidence for profile changes in PSR J1713+0747 using the uGMRT." MNRASL; 507(1) L57–L61. https://doi.org/10.1093/mnrasl/slab098
Low-frequency wideband timing of InPTA pulsars observed with the uGMRT
Published in Monthly Noticed of the Royal Astronomical Society, 2022
Application of the wideband timing method for low-frequency data from the GMRT. This method allows us to simultaneously measure the pulse time of arrival and the dispersion measure for a pulsar observation while dealing with frequency-dependent profile evolution.
Recommended citation: Nobleson, K et al. (2022); "Low-frequency wideband timing of InPTA pulsars observed with the uGMRT." MNRAS; 512(1) 1234-1243. https://doi.org/10.1093/mnras/stac532
The Indian Pulsar Timing Array: First data release
Published in Publications of the Astronomical Society of Australia, 2022
The first data release of the Indian Pulsar Timing Array experiment including times of arrival (TOAs) and dispersion measure (DM) time series for 14 millisecond pulsars spanning 3.5 years.
Recommended citation: Tarafdar P, et al. (2022); "The Indian Pulsar Timing Array: First data release." PASA; 39 e053. https://doi.org/10.1017/pasa.2022.46
Post-Newtonian-accurate pulsar timing array signals induced by inspiralling eccentric binaries: accuracy, computational cost, and single-pulsar search
Published in Classical and Quantum Gravity, 2023
Computationally efficient strategies for computing pulsar timing array signals induced by supermassive eccentric binaries, and their demonstration via a pilot single-pulsar search.
Recommended citation: Susobhanan, A. (2022); "Post-Newtonian-accurate pulsar timing array signals induced by inspiralling eccentric binaries: accuracy, computational cost, and single-pulsar search." CQG; 40 155014. https://doi.org/10.1088/1361-6382/ace234
Gravitational waves from black-hole encounters: Prospects for ground and galaxy-based observatories
Published in Physical Review D, 2023
Gravitational waveform and pulsar timing array signal models for relativistic encounters of stellar-mass and supermassive black holes along hyperbolic trajectories.
Recommended citation: Dandapat S, et al. (2023); "Gravitational waves from black-hole encounters: Prospects for ground and galaxy-based observatories." PRD 108 024013. https://doi.org/10.1103/PhysRevD.108.024013
Noise analysis of the Indian Pulsar Timing Array Data Release I
Published in Physical Review D, 2023
Bayesial characterization of the single-pulsar timing noise, arising from both astrophysical and instrumental sources, in the Indian Pulsar Timing Array (InPTA) data release 1.
Recommended citation: Srivastava A, et al. (2023); "Noise analysis of the Indian Pulsar Timing Array Data Release I." PRD 108 023008. https://doi.org/10.1103/PhysRevD.108.023008
Multi-band Extension of the Wideband Timing Technique
Published in Monthly Notices of the Royal Astronomical Society, 2023
Extension of the wide-band pulsar timing technique to combine simultaneous multi-band observations of the same pulsar.
Recommended citation: Paladi, A K et al. (2023); "Multi-band Extension of the Wideband Timing Technique." MNRAS; 527(1) 213-231. https://doi.org/10.1093/mnras/stad3122
The NANOGrav 12.5 yr Data Set: A Computationally Efficient Eccentric Binary Search Pipeline and Constraints on an Eccentric Supermassive Binary Candidate in 3C 66B
Published in The Astrophysical Journal, 2024
Targeted PTA search for an eccentric supermassive binary in the quasar 3C 66B.
Recommended citation: Agazie G, et al. (2023). "The NANOGrav 12.5 yr Data Set: A Computationally Efficient Eccentric Binary Search Pipeline and Constraints on an Eccentric Supermassive Binary Candidate in 3C 66B." ApJ 963 144. https://doi.org/10.3847/1538-4357/ad1f61
Efficient prescription to search for linear gravitational wave memory from hyperbolic black hole encounters and its application to the NANOGrav 12.5-year dataset
Published in Physical Review D, 2024
Searching for linear gravitational wave memory induced by hyperbolic encounters in the NANOGrav 12.5-year dataset.
Recommended citation: Dandapat S, et al. (2024); "Efficient prescription to search for linear gravitational wave memory from hyperbolic black hole encounters and its application to the NANOGrav 12.5-year dataset." PRD 109 103018 . https://doi.org/10.1103/PhysRevD.109.103018
PINT: Maximum-likelihood estimation of pulsar timing noise parameters
Published in The Astrophysical Journal, 2024
Frequentist single-pulsar noise analysis feature and other new features in the PINT pulsar timing package.
Recommended citation: Susobhanan A, et al. (2024); "PINT: Maximum-likelihood estimation of pulsar timing noise parameters." ApJ 971 150. https://doi.org/10.3847/1538-4357/ad59f7
Bayesian Pulsar Timing and Noise Analysis with Vela.jl: An Overview
Published in The Astrophysical Journal, 2025
Overview of Vela.jl, a new package for Bayesian pulsar timing & noise analysis written in Julia and Python focusing on the narrowband paradigm.
Recommended citation: Susobhanan A, et al. (2025); "Bayesian Pulsar Timing and Noise Analysis with Vela.jl: An Overview." ApJ 980 165. https://doi.org/10.3847/1538-4357/adaaec
Gaussian process representation of dispersion measure noise in pulsar wideband datasets
Published in arXiv eprints, 2025
A general method to incorporate Gaussian process representation of dispersion measure variability in timing and noise analysis of pulsar wideband datasets.
Recommended citation: Susobhanan A and van Haasteren R (2025); "Gaussian process representation of dispersion measure noise in pulsar wideband datasets." arXiv eprints 2505.05274. https://arxiv.org/abs/2505.05274
talks
Introduction to Linux & Python
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Timing a blazar
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pinta: A uGMRT pulsar pipeline
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Introduction to TEMPO2
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Nanohertz Gravitational Waves from Eccentric Supermassive Binaries: A Pilot Single-Pulsar Search
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What’s new in PINT?
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Pulsar Timing with PINT
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Introduction to Pulsar Timing
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teaching
Teaching Assistant for Astronomy & Astrophysics II
Graduate course, Tata Institute of Fundamental Research, 2016
Instructor: Manoj Puravankara
Teaching Assistant for Classical Electrodynamics II (P-206)
Graduate course, Tata Institute of Fundamental Research, 2017
Instructors: Sushil Mujumdar & A. Gopakumar
Teaching Assistant for Astronomy & Astrophysics I
Graduate course, Tata Institute of Fundamental Research, 2018
Instructors: HM Antia & A Gopakumar
Substitute Instructor for Survey of Astronomy (ASTRON 103)
Undergraduate course, University of Wisconsin-Milwaukee, 2023
Instructor: Sarah Vigeland