| Name: | Debabrata Deb |
| Affiliation: | The Institute of Mathematical Sciences, Chennai |
| Conference ID: | ASI2025_659 |
| Title: | The Second Data Release of InPTA: Precise Timing of MSPs and Implications for Gravitational Wave Detection |
| Authors: | Presenting Author: Debabrata Deb, on behalf of Indian Pulsar Timing Array Collaboration |
| Authors Affiliation: | Presenting Author's Affiliation: The Institute of Mathematical Sciences, C. I. T. Campus, Taramani, Chennai 600113, India |
| Mode of Presentation: | Oral |
| Abstract Category: | High Energy Phenomena, Fundamental Physics and Astronomy |
| Abstract: | We present the second data release (DR2) of the Indian Pulsar Timing Array (InPTA) experiment, which provides precise times of arrival (ToAs) and dispersion measures (DMs) for around 27 millisecond pulsars (MSPs) observed using the uGMRT across Band 3 (300–500 MHz) and Band 5 (1260–1460 MHz). By optimizing sub-band selection and using noise-free, frequency-resolved templates, we eliminate the need for frequency-dependent parameters, enhancing timing precision. The time baselines range from 1.2 to 7.3 years, and recent hybrid observations increased coverage for additional pulsars. Precise DMs, with uncertainties between ${10}^{−4}$ and ${10}^{−6}$ pc cm−3, reveal solar wind effects in certain pulsars and highlight potential DM jumps, e.g., in PSR J1125+7819. This dataset, integrated with other PTA datasets for IPTA DR3, will contribute to gravitational wave detection efforts. Ongoing work includes noise modeling, exploring gravitational wave backgrounds, and studying interstellar medium (ISM) effects. Future plans also include leveraging this data for auxiliary science projects on DM and scattering, as well as continued monitoring until the Square Kilometer Array (SKA) becomes operational. |
