Piyush Marmat
A5081873960- Pulsars and Gravitational Waves Research
- Radio Astronomy Observations and Technology
- Advanced Frequency and Time Standards
- GNSS positioning and interference
- Seismic Imaging and Inversion Techniques
- Superconducting and THz Device Technology
- Image and Signal Denoising Methods
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Planetary Science and Exploration
Indian Institute of Technology Roorkee
2021-2024
University of Bern
2023
We present the pulse arrival times and high-precision dispersion measure estimates for 14 millisecond pulsars observed simultaneously in 300-500 MHz 1260-1460 frequency bands using upgraded Giant Metrewave Radio Telescope (uGMRT). The data spans over a baseline of 3.5 years (2018-2021), is first official release made available by Indian Pulsar Timing Array collaboration. This presents unique opportunity investigating interstellar medium effects at low radio frequencies their impact on timing...
Abstract A new era of lunar exploration has begun bringing immense opportunities for science as well. It been proposed to deploy a generation observatories on the surface deep studies our Universe. This includes radio antennas, which would be protected far side Moon from terrestrial interference, and gravitational-wave (GW) detectors, profit extremely low level seismic disturbances Moon. In recent years, novel concepts have GW detectors based long-baseline laser interferometry or compact...
PSR J1713+0747 is one of the most precisely timed pulsars in international pulsar timing array experiment. This showed an abrupt profile shape change between April 16, 2021 (MJD 59320) and 17, 59321). In this paper, we report results from multi-frequency observations carried out with upgraded Giant Metrewave Radio Telescope (uGMRT) before after event. We demonstrate seen Band 5 (1260 MHz - 1460 MHz) 3 (300 500 MHz). The analysis shows a disturbance accompanying followed by recovery timescale...
High-precision measurements of the pulsar dispersion measure (DM) are possible using telescopes with low-frequency wideband receivers. We present an initial study application timing technique, which can simultaneously times arrival (ToAs) and DMs, for a set five pulsars observed upgraded Giant Metrewave Radio Telescope (uGMRT) as part Indian Pulsar Timing Array (InPTA) campaign. have used observations 300-500 MHz band uGMRT this purpose. obtain high precision in DM precisions order...
We present the pulse arrival times and high-precision dispersion measure estimates for 14 millisecond pulsars observed simultaneously in 300-500 MHz 1260-1460 frequency bands using upgraded Giant Metrewave Radio Telescope (uGMRT). The data spans over a baseline of 3.5 years (2018-2021), is first official release made available by Indian Pulsar Timing Array collaboration. This presents unique opportunity investigating interstellar medium effects at low radio frequencies their impact on timing...
ABSTRACT A pulsar’s pulse profile gets broadened at low frequencies due to dispersion along the line of sight or multipath propagation. The dynamic nature interstellar medium makes both these effects time-dependent and introduces slowly varying time delays in measured times-of-arrival similar those introduced by passing gravitational waves. In this article, we present an improved method correct for such obtaining unbiased measure (DM) measurements using low-frequency estimates scattering...
Decades long monitoring of millisecond pulsars, which exhibit highly stable rotational periods, in pulsar timing array experiments is on the threshold discovering nanohertz stochastic gravitational wave background. This paper describes Indian Pulsar (InPTA) experiment, employs upgraded Giant Metrewave Radio Telescope (uGMRT) for an ensemble pulsars this purpose. We highlight InPTA's observation strategies and analysis methods, are relevant a future PTA experiment with more sensitive Square...
A pulsar's pulse profile gets broadened at low frequencies due to dispersion along the line of sight or multi-path propagation. The dynamic nature interstellar medium makes both these effects time-dependent and introduces slowly varying time delays in measured times-of-arrival similar those introduced by passing gravitational waves. In this article, we present a new method correct for such obtaining unbiased measure (DM) measurements using low-frequency estimates scattering parameters. We...