The Indian Pulsar Timing Array data release 2: I. Dataset and timing analysis
astronomy data analysis; Gravitational wave astronomy; millisecond pulsars; pulsar timing method; radio astronomy; Radio telescopes
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 300500 MHz and the 12601460 MHz bands. This dual-band approach ensures that any frequency-dependent delays are accurately characterised, significantly improving the timing precision for pulsar observations, which is crucial for pulsar timing arrays. We present details of InPTAs second data release that involves 7 yr 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 InPTAs first data release, is being incorporated into IPTAs third data release, which is expected to detect and characterise nanohertz gravitational waves (GWs) 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 characterise the noise introduced by the dynamic inter-stellar ionised medium much better than the previous release thereby increasing sensitivity to any future GW search. The Author(s), 2025. Published by Cambridge University Press on behalf of Astronomical Society of Australia.
Rana, Prerna; Tarafdar, Pratik; Nobleson, K.; Dwivedi, Churchil; Joshi, Bhal Chandra; Deb, Debabrata; Mondal, Sushovan; Krishnakumar, M.A.; Shukla, Adya; Singha, Jaikhomba; Grover, Himanshu; Tahbildar, Hemanga; Susobhanan, Abhimanyu; Surnis, Mayuresh; Desai, Shantanu; Batra, Neelam Dhanda; Srivastava, Aman; Bharambe, Vinay; Jose, Jibin; Vyasraj, Vaishnavi; Jacob, Shebin Jose; Amarnath; Singh, Manpreet; Zuraiq, Zenia; Sengupta, Sarbartha; Ogi, Toki; Kumar, Dhruv; Jagadeesh, S.; Kareem, Fazal; Maity, Deep; Rai, Kaustubh; Vara, Kunjal; Chowdhury, Shaswata; Kato, Ryo; Arumugam, Swetha; Mamidipaka, Pragna; Pandian, B. Arul; Shaji, Kavya; Thiagaraj, Prabu; Arumugam, Paramasivan; Bagchi, Manjari; Chakraborty, Manoneeta; Gopakumar, Achamveedu; Gupta, Yashwant; Maan, Yogesh; Paladi, Avinash Kumar; Takahashi, Keitaro
Publications of the Astronomical Society of Australia;Volume;42;Issue;;Article No.;e108;
All Open Access; Green Open Access; Hybrid Gold Open Access
https://doi.org/10.1017/pasa.2025.10066 https://www.scopus.com/pages/publications/105010747551?origin=resultslist
Rana P., Department of Astronomy, University of Cape Town, Cape Town, South Africa, Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Colaba, Mumbai, India; Tarafdar P., The Institute of Mathematical Sciences, C. I. T. Campus, Taramani, Chennai, India; Nobleson K., International Research Organization for Advanced Science and Technology, Kumamoto University, Kumamoto, Japan; Dwivedi C., Astronomy and Astrophysics Division, Physical Research Laboratory, Gujarat, Ahmedabad, India, Department of Earth and Space Sciences, Indian Institute of Space Science and Technology, Kerala, Thiruvananthapuram, India; Joshi B.C., National Centre for Radio Astrophysics, Pune University Campus, Maharashtra, Pune, India, Department of Physics, Indian Institute of Technology Roorkee, Uttarakhand, Roorkee, India; Deb D., The Institute of Mathematical Sciences, C. I. T. Campus, Taramani, Chennai, India; Mondal S., The Institute of Mathematical Sciences, C. I. T. Campus, Taramani, Chennai, India, Homi Bhabha National Institute, Training School Complex, Mumbai, India; Krishnakumar M.A., National Centre for Radio Astrophysics, Pune University Campus, Maharashtra, Pune, India, Max-Planck-Institut f Radioastronomie, Bonn, Germany; Shukla A., Department of Physics, Indian Institute of Technology Roorkee, Uttarakhand, Roorkee, India; Singha J., Department of Mathematics and Applied Mathematics, University of Cape Town, Cape Town, South Africa; Grover H., Department of Physics, Indian Institute of Technology Roorkee, Uttarakhand, Roorkee, India; Tahbildar H., Department of Physics, IISER Bhopal, Bhopal, India; Susobhanan A., Max-Planck-Institut f Gravitationsphysik (Albert-Einstein-Institut), Leibniz Universit Hannover, Hannover, Germany; Surnis M., Department of Physics, IISER Bhopal, Bhopal, India; Desai S., Department of Physics, IIT Hyderabad, Telangana, Kandi, India; Batra N.D., Department of Physics & Astrophysics, University of Delhi, Delhi, India; Srivastava A., Department of Physics, IIT Hyderabad, Telangana, Kandi, India, Department of Physics, GLA University, Uttar Pradesh, Mathura, India; Bharambe V., Department of Physics & Astrophysics, University of Delhi, Delhi, India; Jose J., Department of Astronomy, Astrophysics, and Space Engineering, Indian Institute of Technology Indore, Indore, India; Vyasraj V., Department of Physics, IIT Hyderabad, Telangana, Kandi, India; Jacob S.J., Department of Physics, Government Brennen College, Thalassery, Kannur University, Kerala, Kannur, India; Amarnath, Raman Research Institute, Karnataka, Bengaluru, India, Department of Physics, Cochin University of Science and Technology, Kerala, Kochi, India; Singh M., Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Punjab, Mohali, India; Zuraiq Z., Department of Physics, Indian Institute of Science, Karnataka, Bengaluru, India; Sengupta S., The Institute of Mathematical Sciences, C. I. T. Campus, Taramani, Chennai, India, Homi Bhabha National Institute, Training School Complex, Mumbai, India; Ogi T., Graduate School of Science and Technology, Kumamoto University, Kumamoto, Japan; Kumar D., Department of Physics, National Institute of Technology Agartala, Tripura, India; Jagadeesh S., Department of Engineering Science, IIT Hyderabad, Telangana, Kandi, India; Kareem F., Max-Planck-Institut f Radioastronomie, Bonn, Germany; Maity D., The Institute of Mathematical Sciences, C. I. T. Campus, Taramani, Chennai, India, Homi Bhabha National Institute, Training School Complex, Mumbai, India; Rai K., Department of Physics, IISER Bhopal, Bhopal, India; Vara K., Department of Physics, IISER Bhopal, Bhopal, India; Chowdhury S., The Institute of Mathematical Sciences, C. I. T. Campus, Taramani, Chennai, India; Kato R., Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Mitaka, Tokyo, Japan; Arumugam S., Department of Physics and Astronomy, Clemson University, Clemson, SC, United States; Mamidipaka P., Department of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, PA, United States; Pandian B.A., Raman Research Institute, Karnataka, Bengaluru, India, Department of Physics and Electronics, CHRIST (Deemed to be University), Bengaluru, India; Shaji K., National Centre for Radio Astrophysics, Pune University Campus, Maharashtra, Pune, India, School of Physics, University of Sydney, Camperdown, Australia; Thiagaraj P., Raman Research Institute, Karnataka, Bengaluru, India; Arumugam P., Department of Physics, Indian Institute of Technology Roorkee, Uttarakhand, Roorkee, India; Bagchi M., The Institute of Mathematical Sciences, C. I. T. Campus, Taramani, Chennai, India, Homi Bhabha National Institute, Training School Complex, Mumbai, India; Chakraborty M., Department of Astronomy, Astrophysics, and Space Engineering, Indian Institute of Technology Indore, Indore, India; Gopakumar A., Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Colaba, Mumbai, India; Gupta Y., National Centre for Radio Astrophysics, Pune University Campus, Maharashtra, Pune, India; Maan Y., National Centre for Radio Astrophysics, Pune University Campus, Maharashtra, Pune, India; Paladi A.K., Department of Physics, Indian Institute of Science, Karnataka, Bengaluru, India; Takahashi K., International Research Organization for Advanced Science and Technology, Kumamoto University, Kumamoto, Japan, Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto, Japan