Periodic mode changing in PSR J1048−5832

Yan, W. M.; Manchester, R. N.; Wang, Na; Wen, Z. G.; Yuan, Jianping; Lee, K. J.; Chen, J. L.

doi:10.1093/mnras/stz3399

Cited by 24 publications

(22 citation statements)

References 59 publications

(84 reference statements)

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“…The magnetic field decay occurring in pulsars (especially in magnetars) has been confirmed by a series of theoretical and observational studies (Kaspi & Beloborodov 2017). The MDR model allows a change in magnetic moment M and/or a change in the angle α of a pulsar; the latter is usually companied with a change in pulse profiles (Wen et al 2016a, 2016b, 2020; Yan et al 2019, 2020; Zhao et al 2020). If the changes of M and α are considered simultaneously, the observed braking index n obs is obtained as

n_{normalobs} = 3 + \frac{2 Ω}{\overset{Ω}{true}} (\frac{\overset{α}{true}}{\tan α} + \frac{\overset{M}{true}}{M})

from Equation (18) and Equation (19), where

\dot{α}

is the derivative of α , and

\dot{M}

is the derivative of M .…”

Section: Two Work In Progressmentioning

confidence: 99%

The dissipation of toroidal magnetic fields and spin‐down evolution of young and strongly magnetized pulsars

2021

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Magnetars are a kind of pulsars powered mainly by superhigh magnetic fields. They are popular sources with many unsolved issues in themselves but are also linked to various high-energy phenomena, such as quasi periodic oscillations (QPOs), giant flares, fast radio bursts, and superluminous supernovae. In this work, we first review our recent works on the dissipation of toroidal magnetic fields in magnetars and rotationally powered pulsars and then review the spin-down evolution of young and strongly magnetized pulsars, especially of magnetars. We present an interesting and important relation between the magnetization parameter and magnetic field in the magnetar crust. Finally, we introduce our two works in progress: to explain the magnetar "antiglitch" events in the thermal plastic flow model and to revisit the expression of braking index n, which is independent of the second derivative of spin frequency of a pulsar, and give some proposals for our future work.

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n_{normalobs} = 3 + \frac{2 Ω}{\overset{Ω}{true}} (\frac{\overset{α}{true}}{\tan α} + \frac{\overset{M}{true}}{M})

from Equation (18) and Equation (19), where

\dot{α}

is the derivative of α , and

\dot{M}

is the derivative of M .…”

Section: Two Work In Progressmentioning

confidence: 99%

The dissipation of toroidal magnetic fields and spin‐down evolution of young and strongly magnetized pulsars

2021

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“…A number of studies in the recent past (Basu et al 2016; Yan et al 2019Yan et al , 2020 have highlighted the physical differences between subpulse drifting and low frequency modulations corresponding to periodic nulling and periodic amplitude modulation. The subpulse drifting is only associated with conal components while the entire pulsar emission is simultaneously affected by periodic modulations.…”

Section: Discussionmentioning

confidence: 99%

Subpulse Drifting and Periodic Nulling in single pulse emission of PSR B2000+40

Basu¹,

Lewandowski²,

Kijak³

2020

Preprint

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We have carried out a detailed study of single pulse emission from the pulsar B2000+40 (J2002+4050), observed at 1.6 GHz frequencies using the Effelsberg radio telescope. The pulsar has three components which are not well separated, with the central component resembling core emission. We have investigated modulations in single pulse behaviour using the fluctuation spectral analysis which showed presence of two prominent periodicities, around 2.5P and 40P , respectively. The shorter periodicity was associated with the phenomenon of subpulse drifting and was seen to be absent in central core component. Drifting showed large phase variations in conal components. Additionally, the periodic modulations had significant evolution with time, varying between very sharp and highly diffuse features. In addition to drifting the pulsar also had presence of nulling in the single pulse sequence. The longer periodic feature in the fluctuation spectra was associated with nulling behaviour. The pulsar joins a select group which shows the presence of phase modulated drifting as well as periodic nulling in the presence of core emission. This provides further evidence for the two phenomena to be distinct from each other with different physical origin.

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“…Periodic nulling has been observed in many pulsars (Herfindal & Rankin 2007, 2009Rankin & Wright 2008;Rankin et al 2013;Gajjar et al 2014Gajjar et al , 2017Basu et al 2017;Basu & Mitra 2018;Basu et al 2019b;Basu & Mitra 2019). Recently, periodic mode changing also has been reported in some pulsars (Mitra & Rankin 2017;Basu & Mitra 2019;Yan et al 2019Yan et al , 2020.…”

Section: Introductionmentioning

confidence: 94%

Nulling and subpulse drifting in PSR J1727-2739

Rejep,

Wang,

Yan

et al. 2021

Preprint

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In this paper, we investigate the emission properties of PSR J1727−2739, whose mean pulse profile has two main components, by analysing five single-pulse observations made using the Parkes 64-m radio telescope with a central frequency of 1369 MHz between 2014 April and October. The total observation time is about 6.1 hours which contains 16718 pulses after removal of radio frequency interference (RFI). Previous studies reveal that PSR J1727−2739 exhibits both nulling and subpulse drifting. We estimate the nulling fraction to be 66%±1.4%, which is consistent with previously published results. In addition to the previously known subpulse drifting in the leading component, we also explore the drifting properties for the trailing component. We observe two distinct drift modes whose vertical drift band separations ( 3 ) are consistent with earlier studies. We find that both profile components share the same drift periodicity 3 in a certain drift mode, but the measured horizontal separations ( 2 ) are quite different for them. That is, PSR J1727−2739 is a pulsar showing both changes of drift periodicity 3 between different drift modes and drift rate variations between components in a given drift mode. Pulsars exhibiting nulling along with drift mode changing, such as PSR J1727−2739, give an unique opportunity to investigate the physical mechanism of these phenomena.

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Periodic mode changing in PSR J1048−5832

Cited by 24 publications

References 59 publications

The dissipation of toroidal magnetic fields and spin‐down evolution of young and strongly magnetized pulsars

The dissipation of toroidal magnetic fields and spin‐down evolution of young and strongly magnetized pulsars

Subpulse Drifting and Periodic Nulling in single pulse emission of PSR B2000+40

Nulling and subpulse drifting in PSR J1727-2739

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