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Taylor, Helena

doi:10.2307/43629470

Cited by 14 publications

(17 citation statements)

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“…We generated TOAs with a template-matching procedure (Taylor 1992) (Hotan et al 2004;van Straten et al 2012). Outlier TOAs were removed via an automated method where we removed TOAs with the probability of being within the uniform outlier distribution 10% (Vallisneri & van Haasteren 2017;Arzoumanian et al 2018).…”

Section: Observationsmentioning

confidence: 99%

A Second Chromatic Timing Event of Interstellar Origin toward PSR J1713+0747

Lam

Ellis

Grillo

et al. 2018

ApJ

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The frequency dependence of radio pulse arrival times provides a probe of structures in the intervening media. Demorest et al. was the first to show a short-term (∼100-200 days) reduction in the electron content along the line of sight to PSRJ1713+0747 in data from 2008 (approximately MJD 54750) based on an apparent dip in the dispersion measure of the pulsar. We report on a similar event in 2016 (approximately MJD 57510), with average residual pulse-arrival times ≈−3.0, −1.3, and −0.7 μs at 820, 1400, and 2300MHz, respectively. Timing analyses indicate possible departures from the standard ν −2 dispersive-delay dependence. We discuss and rule out a wide variety of potential interpretations. We find the likeliest scenario to be lensing of the radio emission by some structure in the interstellar medium, which causes multiple frequency-dependent pulse arrival-time delays.

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Section: Observationsmentioning

confidence: 99%

A Second Chromatic Timing Event of Interstellar Origin toward PSR J1713+0747

Lam

Ellis

Grillo

et al. 2018

ApJ

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“…We calculated pulse times of arrival (TOAs) via Fourierdomain cross-correlation of a noise-free template and the observed pulse profile (Taylor 1992). Initial templates were created by fitting one or more Gaussians to the pulse profiles.…”

Section: Pulsar Timing Analysismentioning

confidence: 99%

The Green Bank North Celestial Cap Pulsar Survey. III. 45 New Pulsar Timing Solutions

Lynch

Swiggum

Kondratiev

et al. 2018

ApJ

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We provide timing solutions for 45 radio pulsars discovered by the Robert C. Byrd Green Bank Telescope. These pulsars were found in the Green Bank North Celestial Cap pulsar survey, an all-GBT-sky survey being carried out at a frequency of 350 MHz. We include pulsar timing data from the Green Bank Telescope and Low Frequency Array. Our sample includes five fully recycled millisecond pulsars (MSPs, three of which are in a binary system), a new relativistic double neutron star system, an intermediate-mass binary pulsar, a mode-changing pulsar, a 138 ms pulsar with a very low magnetic field, and several nulling pulsars. We have measured two post-Keplerian parameters and thus the masses of both objects in the double neutron star system. We also report a tentative companion mass measurement via Shapiro delay in a binary MSP. Two of the MSPs can be timed with high precision and have been included in pulsar timing arrays being used to search for low-frequency gravitational waves, while a third MSP is a member of the black widow class of binaries. Proper motion is measurable in five pulsars, and we provide an estimate of their space velocity. We report on an optical counterpart to a new black widow system and provide constraints on the optical counterparts to other binary MSPs. We also present a preliminary analysis of nulling pulsars in our sample. These results demonstrate the scientific return of long timing campaigns on pulsars of all types.

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“…Narrowband template fitting (Taylor 1992) assumes a relatively constant profile with frequency. In addition to distorting the pulse phase, merely averaging across frequency would result in drifting residuals with a nonwhite appearance (Craft 1970), due to the intrinsic profile evolution acting in combination with ISS.…”

Section: Description Of the Datamentioning

confidence: 99%

A 24 Hr Global Campaign to Assess Precision Timing of the Millisecond Pulsar J1713+0747

Dolch

Lam

Cordes

et al. 2014

ApJ

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General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Download date: 08 May 2018The Astrophysical Journal, 794:21 (14pp), 2014 October 10 doi:10.1088/0004-637X/794/1/21 C 2014. The American Astronomical Society. All rights reserved. Printed in the U.S.A. A 24 HR GLOBAL CAMPAIGN TO ASSESS PRECISION TIMING OF THE MILLISECOND PULSAR J1713+0747 ABSTRACTThe radio millisecond pulsar J1713+0747 is regarded as one of the highest-precision clocks in the sky and is regularly timed for the purpose of detecting gravitational waves. The International Pulsar Timing Array Collaboration undertook a 24 hr global observation of PSR J1713+0747 in an effort to better quantify sources of timing noise in this pulsar, particularly on intermediate (1-24 hr) timescales. We observed the pulsar continuously over 24 hr with the Arecibo, Effelsberg, GMRT, Green Bank, LOFAR, Lovell, Nançay, Parkes, and WSRT radio telescopes. The combined pulse times-of-arrival presented here provide an estimate of what sources of timing noise, excluding DM variations, would be present as compared to an idealized √ N improvement in timing precision, where N is the number of pulses analyzed. In the case of this particular pulsar, we find that intrinsic pulse phase jitter dominates arrival time precision when the signal-to-noise ratio of single pulses exceeds unity, as measured using the eight telescopes that observed at L band/1.4 GHz. We present first results of specific phenomena probed on the unusually long timescale (for a single continuous observing session) of tens of hours, in particular interstellar scintillation, and discuss the degree to which scintillation and profile evolution affect precision timing. This paper presents the data set as a basis for future, deeper studies.

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Cited by 14 publications

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A Second Chromatic Timing Event of Interstellar Origin toward PSR J1713+0747

A Second Chromatic Timing Event of Interstellar Origin toward PSR J1713+0747

The Green Bank North Celestial Cap Pulsar Survey. III. 45 New Pulsar Timing Solutions

A 24 Hr Global Campaign to Assess Precision Timing of the Millisecond Pulsar J1713+0747

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