The Indian Pulsar Timing Array Data Release 2: I. Dataset and Timing Analysis
Abstract
The Indian Pulsar Timing Array (InPTA) employs unique features of the upgraded Giant Metrewave Radio Telescope (uGMRT) to monitor dozens of the International Pulsar Timing Array (IPTA) millisecond pulsars (MSPs), simultaneously in the 300-500 MHz and the 1260-1460 MHz bands. This dual-band approach ensures that any frequency-dependent delays are accurately characterized, significantly improving the timing precision for pulsar observations, which is crucial for pulsar timing arrays. We present details of InPTA's second data release that involves 7 yrs of data on 27 IPTA MSPs. This includes sub-banded Times of Arrival (ToAs), Dispersion Measures (DM), and initial timing ephemerides for our MSPs. A part of this dataset, originally released in InPTA's first data release, is being incorporated into IPTA's third data release which is expected to detect and characterize nanohertz gravitational waves in the coming years. The entire dataset is reprocessed in this second data release providing some of the highest precision DM estimates so far and interesting solar wind related DM variations in some pulsars. This is likely to characterize the noise introduced by the dynamic inter-stellar ionised medium much better than the previous release thereby increasing sensitivity to any future gravitational wave search.
Keywords
Cite
@article{arxiv.2506.16769,
title = {The Indian Pulsar Timing Array Data Release 2: I. Dataset and Timing Analysis},
author = {Prerna Rana and Pratik Tarafdar and Nobleson K and Churchil Dwivedi and Bhal Chandra Joshi and Debabrata Deb and Sushovan Mondal and M. A. Krishnakumar and Adya Shukla and Jaikhomba Singha and Himanshu Grover and Hemanga Tahbildar and Abhimanyu Susobhanan and Mayuresh Surnis and Shantanu Desai and Neelam Dhanda Batra and Aman Srivastava and Vinay Bharambe and Jibin Jose and Vaishnavi Vyasraj and Shebin Jose Jacob and Amarnath and Manpreet Singh and Zenia Zuraiq and Sarbartha Sengupta and Toki Ogi and Dhruv Kumar and S Jagadeesh and Fazal Kareem and Deep Maity and Kaustubh Rai and Kunjal Vara and Shaswata Chowdhury and Ryo Kato and Swetha Arumugam and Pragna Mamidipaka and Arul Pandian B and Kavya Shaji and Prabu Thiagaraj and P. Arumugam and Manjari Bagchi and Manoneeta Chakraborty and A. Gopakumar and Yashwant Gupta and Yogesh Maan and Avinash Kumar Paladi and Keitaro Takahashi},
journal= {arXiv preprint arXiv:2506.16769},
year = {2025}
}
Comments
34 pages, 35 figures, and 3 tables. Accepted for publication in Publications of the Astronomical Society of Australia (PASA) journal