Wide-band Timing of GMRT-discovered Millisecond Pulsars

Sharma, Shyam Sundar; Roy, Jayanta; Bhattacharyya, Bhaswati; Levin, Lina; Stappers, B. W.; Pennucci, Timothy T.; Schult, Levi; Singh, Shubham; A., Kaninghat,

doi:10.3847/1538-4357/ac86d8

Cited by 4 publications

(8 citation statements)

References 32 publications

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“…Apart from showing the aforementioned consistency between results obtained with wideand narrowband methods, Nobleson et al (2022) also emphasize an increased precision of low-frequency DM measurements and prove wide-band timing methods to be beneficial even for small fractional bandwidths. Other examples of implementations of methods presented by Pennucci et al (2014) can be found in Fonseca et al (2021) and Sharma et al (2022), where the analyses focus on detailed binary parameter estimation and study of new PTA-candidate pulsars, respectively.…”

Section: Introductionmentioning

confidence: 99%

Wide-band Timing of the Parkes Pulsar Timing Array UWL Data

Curyło

Pennucci

Bailes

et al. 2023

ApJ

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In 2018 an ultra–wide-bandwidth low-frequency (UWL) receiver was installed on the 64 m Parkes Radio Telescope, enabling observations with an instantaneous frequency coverage from 704 to 4032 MHz. Here we present the analysis of a 3 yr data set of 35 ms pulsars observed with the UWL by the Parkes Pulsar Timing Array, using wide-band timing methods. The two key differences compared to typical narrowband methods are (1) generation of two-dimensional templates accounting for pulse shape evolution with frequency and (2) simultaneous measurements of the pulse time of arrival (TOA) and dispersion measure (DM). This is the first time that wide-band timing has been applied to a uniform data set collected with a single large fractional bandwidth receiver, for which such techniques were originally developed. As a result of our study, we present a set of profile evolution models and new timing solutions, including initial noise analysis. Precision of our TOA and DM measurements is in the range of 0.005–2.08 μs and (0.043–14.24) × 10−4 cm−3 pc, respectively, with 94% of the pulsars achieving a median TOA uncertainty of less than 1 μs.

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Section: Introductionmentioning

confidence: 99%

Wide-band Timing of the Parkes Pulsar Timing Array UWL Data

Curyło

Pennucci

Bailes

et al. 2023

ApJ

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“…Phase-coherent timing has been obtained for the GSB observations for these four MSPs and was reported in Bhattacharyya et al (2019) and Bhattacharyya et al (2022). Sharma et al (2022) reported the phase-coherent timing with GWB observations for the same MSPs, which accounts for 2− 4 yr of observational timing baseline.…”

Section: Introductionmentioning

confidence: 68%

Decade-long Timing of Four GMRT Discovered Millisecond Pulsars

Sharma,

Roy,

Bhattacharyya

et al. 2024

ApJ

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The discovery and timing follow up of millisecond pulsars (MSPs) are necessary not just for their usefulness in pulsar timing arrays (PTAs) but also for investigating their own intriguing properties. In this work, we provide the findings of the decade-long timing of four MSPs discovered by the Giant Meterwave Radio Telescope (GMRT), including their timing precision, model parameters, and newly detected proper motions. We compare the timing results for these MSPs before and after the GMRT upgrade in 2017 and characterize the improvement in timing precision due to the bandwidth upgrade. We discuss the suitability of these four GMRT MSPs as well as the usefulness of the decade-long timing data for PTA experiments. These data may aid in the global effort to improve the signal-to-noise ratios of recently detected signature of gravitational waves in cross-correlation statistics of residuals of MSPs.

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“…The results from the timing studies will be reported in the future GHRSS publications. Sharma et al (2022) recently reported the long-term wideband timing of four GMRT-discovered MSPs. Considering band 3 detection S/N, those four MSPs are roughly 4 times weaker than the two MSPs reported in this paper.…”

Section: Discussionmentioning

confidence: 95%

“…This 2D template is created in PulsePortraiture using principal-component-decomposition (Pennucci 2019). To extract the wide-band ToA and DM from the observational data, we used the same strategy described in Sharma et al (2022).…”

Section: Toa and Dm Precisionmentioning

confidence: 99%

“…Using these precise positions, Bhattacharyya et al (2022) demonstrated phase coherent timing solutions for three of those MSPs (J1120−3618, J1646−2142, and J1828+0625) using the legacy GMRT. Along with a GHRSS MSP (J2144−5237), these three MSPs were followed by Sharma et al (2022) using the upgraded GMRT (uGMRT). Sharma et al (2022) reported ∼3.4 times better timing precision for these MSPs with the uGMRT wide-band receiver observations compared to the legacy GMRT narrowband observations reported in Bhattacharyya et al (2022) and investigated the possibility of using them in the PTA experiment.…”

Section: Introductionmentioning

confidence: 99%

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The GMRT High Resolution Southern Sky Survey for Pulsars and Transients. V. Localization of Two Millisecond Pulsars

Sharma

Roy

Kudale

et al. 2023

ApJ

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The timing follow-up of newly discovered millisecond pulsars (MSPs) is hindered by the larger positional uncertainty (a few tens of arcminutes) associated with the discovery. In this paper, we present the localization of two MSPs, discovered by the GMRT High Resolution Southern Sky survey, up to arcsecond accuracy using a 33 MHz offline coherently dedispersed gated correlator. This gated correlator is an upgraded version of the earlier 16 MHz design. This new development with a factor of 2 enhancement in the observing bandwidth offers better sensitivity in the image domain, leading to more precise localization. Aided by the precise position, we followed up these two MSPs with sensitive phased-array (PA) beams of upgraded GMRT from 300 to 1460 MHz. More sensitive observations in the PA mode for these two MSPs yield precise (∼sub-μs) time-of-arrivals, with dispersion measure uncertainties in the range of 10−4–10−5 pc cm−3. We also report the profile evolution of the two MSPs over 300–1460 MHz. Finally, we discuss the suitability of these MSPs for the pulsar timing array experiments aimed to detect low-frequency gravitational waves.

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Wide-band Timing of GMRT-discovered Millisecond Pulsars

Cited by 4 publications

References 32 publications

Wide-band Timing of the Parkes Pulsar Timing Array UWL Data

Wide-band Timing of the Parkes Pulsar Timing Array UWL Data

Decade-long Timing of Four GMRT Discovered Millisecond Pulsars

The GMRT High Resolution Southern Sky Survey for Pulsars and Transients. V. Localization of Two Millisecond Pulsars

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