The LOFAR Tied-Array All-Sky Survey: Timing of 21 pulsars including the first binary pulsar discovered with LOFAR

Abstract

We report on the multi-frequency timing observations of 21 pulsars discovered in the LOFAR Tied-Array All-Sky Survey (LOTAAS). The timing data were taken at central frequencies of 149 MHz (LOFAR) as well as 334 and 1532 MHz (Lovell Telecope). The sample of pulsars includes 20 isolated pulsars and the first binary pulsar discovered by the survey, PSR J1658$+$3630. We modelled the timing properties of the pulsars, which showed that they have, on average, larger characteristic ages. We present the pulse profiles of the pulsars across the three observing bands, where PSR J1643$+$1338 showed profile evolution that appears not to be well-described by the radius-to-frequency-mapping model. Furthermore, we modelled the spectra of the pulsars across the same observing bands, using a simple power law, and found an average spectral index of $-1.9\pm 0.5$. Amongst the pulsars studied here, PSR J1657$+$3304 showed large flux density variations of a factor of 10 over 300 days, as well as mode changing and nulling on timescales of a few minutes. We modelled the rotational and orbital properties of PSR J1658$+$3630, which has a spin period of 33 ms in a binary orbit of 3.0 days with a companion of minimum mass of 0.87$M_{\odot }$, likely a Carbon-Oxygen or Oxygen-Neon-Magnesium type white dwarf. PSR J1658$+$3630 has a dispersion measure of 3.0 pc cm${}^{-3}$, making it possibly one of the closest binary pulsars known.

21 pages, 12 figures, Accepted for publication in the Monthly Notices of the Royal Astronomical Society

References in corpus (23)

• Shapiro delay measurement of a two solar mass neutron star
• TEMPO2, a new pulsar timing package. I: Overview
• A New Electron Density Model for Estimation of Pulsar and FRB Distances
• PSRCHIVE and PSRFITS An Open Approach to Radio Pulsar Data Storage and Analysis
• Tempo2, a new pulsar timing package. II: The timing model and precision estimates
• Switched magnetospheric regulation of pulsar spin-down
• A periodically active pulsar giving insight into magnetospheric physics
• Pulsar Nulling and Mode Changing
• Found: The missing blue opacity in atmosphere models of cool hydrogen white dwarfs
• The Chandra Deep Protocluster Survey: Ly-alpha Blobs are powered by heating, not cooling
• Wide-band Simultaneous Observations of Pulsars: Disentangling Dispersion Measure and Profile Variations
• The LOFAR Tied-Array All-Sky Survey (LOTAAS): Survey overview and initial pulsar discoveries
• The LOFAR Pilot Surveys for Pulsars and Fast Radio Transients
• Pulsar polarisation below 200 MHz: Average profiles and propagation effects
• LOFAR discovery of the fastest-spinning millisecond pulsar in the Galactic field
• Scattering analysis of LOFAR pulsar observations
• Detection of new pulsars at the frequency 111 MHz
• Pulsars with gigahertz-peaked spectra
• PSR J2322$-$2650 -- A low-luminosity millisecond pulsar with a planetary-mass companion
• Frequency dependence of pulse width for 150 radio normal pulsars
• Understanding the spin-down rate changes of PSR B0919+06
• Search and detection of pulsars in the monitoring observations at the frequency 111 MHz
• The LOFAR Tied-Array All-Sky Survey (LOTAAS): Characterization of 20 pulsar discoveries and their single-pulse behavior

Cited by in corpus (15)

• The FAST Galactic Plane Pulsar Snapshot survey: VI. The discovery of 473 new pulsars
• V-LoTSS: The Circularly-Polarised LOFAR Two-metre Sky Survey
• Pushchino multibeam pulsar search: I. Targeted search of weak pulsars
• Searching for pulsars associated with polarised point sources using LOFAR: Initial discoveries from the TULIPP project
• Discovery of a steep-spectrum low-luminosity pulsar with the Murchison Widefield Array
• First Results from the REAL-time Transient Acquisition backend (REALTA) at the Irish LOFAR station
• The second decametre pulsar census at UTR-2 radio telescope
• Searching for Magnetar Binaries Disrupted by Core-Collapse Supernovae
• Arecibo Pulsar Beam Geometry at Lower Frequencies Radio Pulsar Beam Geometry Down to the 100-MHz Band: 76 Additional Sources Within the Arecibo Sky
• Global Sky Models can Improve Flux Estimates in Pulsar and FRB Studies
• Absence of TeV halos around millisecond pulsars
• Search for periodic emission of five gamma-ray pulsars at the frequency of 111 MHz
• PSR J1227$-$6208 and its massive white dwarf companion: pulsar emission analysis, timing update and mass measurements
• Identification of radio and gamma-ray pulsars in X-rays using data from the SRG/eROSITA all-sky survey
• Pulsars identified in the LOFAR Two-metre Sky Survey at 144 MHz