A Study in Frequency-Dependent Effects on Precision Pulsar Timing Parameters with the Pulsar Signal Simulator

Abstract

In this paper we introduce a new Python package, the Pulsar Signal Simulator, or PsrSigSim, which is designed to simulate a pulsar signal from emission at the pulsar, through the interstellar medium, to observation by a radio telescope, and digitization in a standard data format. We use the PsrSigSim to simulate observations of three millisecond pulsars, PSRs J1744--1134, B1855+09, and B1953+29, to explore the covariances between frequency-dependent parameters, such as variations in the dispersion measure (DM), pulse profile evolution with frequency, and pulse scatter broadening. We show that the PsrSigSim can produce realistic simulated data and can accurately recover the parameters injected into the data. We also find that while there are covariances when fitting DM variations and frequency-dependent parameters, they have little effect on timing precision. Our simulations also show that time-variable scattering delays decrease the accuracy and increase the variability of the recovered DM and frequency-dependent parameters. Despite this, our simulations also show that the time-variable scattering delays have little impact on the root mean square of the timing residuals. This suggests that the variability seen in recovered DM, when time-variable scattering delays are present, is due to a covariance between the two parameters, with the DM modeling out the additional scattering delays.

arXiv comment21 pages, 9 figures, 7 tables, accepted for publication in ApJ

References in corpus (39)

• Astropy: A Community Python Package for Astronomy
• The NumPy array: a structure for efficient numerical computation
• A Massive Pulsar in a Compact Relativistic Binary
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• Relativistic Shapiro delay measurements of an extremely massive millisecond pulsar
• Tests of general relativity from timing the double pulsar
• PSRCHIVE and PSRFITS An Open Approach to Radio Pulsar Data Storage and Analysis
• The NANOGrav 12.5-year Data Set: Search For An Isotropic Stochastic Gravitational-Wave Background
• The NANOGrav 11-year Data Set: High-precision timing of 45 Millisecond Pulsars
• European Pulsar Timing Array Limits On An Isotropic Stochastic Gravitational-Wave Background
• Gravitational waves from binary supermassive black holes missing in pulsar observations
• The International Pulsar Timing Array: First Data Release
• The North American Nanohertz Observatory for Gravitational Waves
• The NANOGrav 11-year Data Set: Pulsar-timing Constraints On The Stochastic Gravitational-wave Background
• Limits on the Stochastic Gravitational Wave Background from the North American Nanohertz Observatory for Gravitational Waves
• The NANOGrav Nine-year Data Set: Limits on the Isotropic Stochastic Gravitational Wave Background
• The characteristics of millisecond pulsar emission: I. Spectra, pulse shapes and the beaming fraction
• European Pulsar Timing Array Limits on Continuous Gravitational Waves from Individual Supermassive Black Hole Binaries
• The Parkes Pulsar Timing Array
• Spectral properties of 441 radio pulsars
• Gravitational-wave Limits from Pulsar Timing Constrain Supermassive Black Hole Evolution
• Testing the universality of free fall by tracking a pulsar in a stellar triple system
• The NANOGrav 11-Year Data Set: Limits on Gravitational Waves from Individual Supermassive Black Hole Binaries
• The NANOGrav 12.5 yr Data Set: Observations and Narrowband Timing of 47 Millisecond Pulsars
• PALFA Discovery of a Highly Relativistic Double Neutron Star Binary
• An all-sky search for continuous gravitational waves in the Parkes Pulsar Timing Array data set
• Tests of Gravitational Symmetries with Pulsar Binary J1713+0747
• The NANOGrav Nine-Year Data Set: Measurement and Interpretation of Variations in Dispersion Measures
• The NANOGrav 12.5-year Data Set: Wideband Timing of 47 Millisecond Pulsars
• Testing Theories of Gravitation Using 21-Year Timing of Pulsar Binary J1713+0747
• Elementary Wideband Timing of Radio Pulsars
• Realistic sensitivity curves for pulsar timing arrays
• The NANOGrav Nine-year Data Set: Monitoring Interstellar Scattering Delays
• A Second Chromatic Timing Event of Interstellar Origin toward PSR J1713+0747
• Pulse intensity modulation and the timing stability of millisecond pulsars: A case study of PSR J1713+0747
• The NANOGrav 12.5-Year Data Set: The Frequency Dependence of Pulse Jitter in Precision Millisecond Pulsars
• Measuring Interstellar Delays of PSR J0613-0200 over 7 years, using the Large European Array for Pulsars
• Optimizing Pulsar Timing Arrays Observations for Detection and Characterization of Low-Frequency Gravitational Wave Sources
• Analysis of Multi-Hour Continuous Observations of Seven Millisecond Pulsars

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