Radio emission features in different modes of PSR J0826+2637 (B0823+26)

Basu, Rahul; Mitra, Dipanjan

doi:10.1093/mnras/stz1590

Cited by 23 publications

(15 citation statements)

References 61 publications

(109 reference statements)

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“…Detailed work of Herfindal & Rankin (2009) identified additional 9 pulsars to show this behaviour, which was further increased to a total of 19 pulsars by Basu et al (2017, see Table 3 of this paper). Subsequently, pe- riodic nulling was also detected in PSR B0823+26 (Basu & Mitra 2019), PSR B1819−22 (Basu & Mitra 2018b) and PSR B2003−08 (Basu et al 2019b). We have identified an additional 8 pulsars which exhibit periodic nulling in Table 1.…”

Section: Pulsars With Periodic Modulationsmentioning

confidence: 64%

“…Some of the interesting physical behaviour of periodic amplitude modulation are summarized below. The pulsar B0823+26 has periodic amplitude modulation during its B mode, while the Q mode shows periodic nulling (Basu & Mitra 2019). The two modes in PSR B1822−09 have periodic amplitude modulation with different periodicities (Latham et al 2012;Hermsen et al 2017;Yan et al 2019).…”

Section: Periodic Amplitude Modulationmentioning

confidence: 99%

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Periodic Modulation: Newly Emergent Emission Behavior in Pulsars

Basu

Mitra

Melikidze

2020

ApJ

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Periodic modulations are seen in normal period pulsars (P > 0.1 sec) over timescales ranging from a few seconds to several minutes. Such modulations have usually been associated with the phenomenon of subpulse drifting. A number of recent studies have shown subpulse drifting to exhibit very specific physical characteristics : i) drifting is seen only in conal components of the pulse profile and is absent in central core emission; ii) drifting pulsars are distributed over a narrow range of spin-down energy loss (Ė), where pulsars withĖ < 2×10 32 erg s −1 show this behaviour, iii) drifting periodicity (P 3 ) is anti-correlated witḣ E, such that pulsars with lower values ofĖ tend to have longer P 3 . These detailed characterisations of drifting behaviour on the other hand also revealed the presence of other distinct periodic modulations, which can be broadly categorised into two types, periodic nulling and periodic amplitude modulation. In contrast to drifting these periodic phenomena are seen across the entire profile in both the core and conal components simultaneously and are not restricted to any specificĖ range. In this work we have assembled an exhaustive list of around 70 pulsars which show such periodic modulations, 22 of which were newly detected using observations from the Giant Meterwave Radio Telescope and the remaining compiled from past publications. The presence of such a significant group in the pulsar population suggests that periodic nulling and periodic amplitude modulations to be newly emergent phenomena in pulsars with their physical origin distinct from subpulse drifting. Rankin, J.M.; Weisberg, J.M. 2016, MNRAS, 461, 3740 Weisberg, J.M.; Armstrong, B.K.; Backus, P.R.; Cordes, J.M.; Boriakoff, V.; Ferguson, D.C. 1986, AJ, 92, 621 Weltevrede, P.; Edwards, R. T.; Stappers, B. W. 2006, A&A, 445, 243 Weltevrede, P.; Edwards, R. T.; Stappers, B. W. 2007, A&A, 469, 607 Wen, Z.G.; Wang, N.; Yuan, J.P.; Yan, W.M.; Manchester, R.N.; Yuen, R.; Gajjar, V. 2016, A&A, 592, 127

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Section: Pulsars With Periodic Modulationsmentioning

confidence: 64%

Section: Periodic Amplitude Modulationmentioning

confidence: 99%

Periodic Modulation: Newly Emergent Emission Behavior in Pulsars

Basu

Mitra

Melikidze

2020

ApJ

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“…This could also not be explained using the carousel model and was considered as an entirely new phenomenon. In a recent work by Basu & Mitra (2019), the periodic amplitude modulation has also been seen in the core single pulsar PSR J0826+2637. A periodic phase-stationary intensity modulation occurring in the interpulse and the main pulse was observed in PSR J1825−0935 (Fowler & Wright 1982;Gil et al 1994;Backus et al 2010;Latham et al 2012;Hermsen et al 2017;Yan et al 2019).…”

Section: Discussionmentioning

confidence: 73%

“…Periodic nulling has been reported in some 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). Observed periodicities in the amplitude modulation of some components of some pulsars are very similar to periodic nulling, and therefore Basu et al (2017) suggested that they have a common origin.…”

Section: Discussionmentioning

confidence: 90%

Periodic mode changing in PSR J1048−5832

Yan

Manchester

Wang

et al. 2019

Monthly Notices of the Royal Astronomical Society

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By analysing the data acquired from the Parkes 64-m radio telescope at 1369 MHz, we report on the phase-stationary non-drift amplitude modulation observed in PSR J1048−5832. The high-sensitivity observations revealed that the central and trailing components of the pulse profile of this pulsar switch between a strong mode and a weak mode periodically. However, the leading component remains unchanged. Polarization properties of the strong and weak modes are investigated. Considering the similarity to mode changing, we argue that the periodic amplitude modulation in PSR J1048−5832 is periodic mode changing. The fluctuation spectral analysis showed that the modulation period is very short (∼2.1 s or 17P 1 ), where P 1 is the rotation period of the pulsar. We find that this periodic amplitude modulation is hard to explain by existing models that account for the periodic phenomena in pulsars like subpulse drifting.

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“…Recently, the prominent "quiet" and "bright" modes were identified, which might be related to the change of the plasma formation front (e.g., Sobey et al 2015;Rankin et al 2020). In the bright mode, the nulls had a fraction of a few percent, but more than 90% in the quiet mode (Basu & Mitra 2019).…”

Section: Psr J0826+2637mentioning

confidence: 97%

Jiamusi pulsar observations

Wang

Han

et al. 2020

A&A

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Aims. Most pulsar nulling observations have been conducted at frequencies lower than 1400 MHz. We aim to understand the nulling behaviors of pulsars at relatively high frequencies, and to decipher whether or not nulling is caused by a global change in the pulsar magnetosphere. Methods. We used the Jiamusi 66 m telescope to observe 20 bright pulsars at 2250 MHz with unprecedented lengths of time. We estimated the nulling fractions of these pulsars, and identified the null and emission states of the pulses. We also calculated the nulling degrees and scales of the emission-null pairs to describe the distributions of emission and null lengths. Results. Three pulsars, PSRs J0248+6021, J0543+2329, and J1844+00, are found to null for the first time. The details of null-to-emission and emission-to-null transitions within the pulse window are observed for the first time for PSR J1509+5531, which is a low-probability event. A complete cycle of long nulls with timescales of hours is observed for PSR J1709−1640. For most of these pulsars, the K-S tests of nulling degrees and nulling scales reject the hypothesis that null and emission are caused by random processes at high significance levels. Emission-null sequences of some pulsars exhibit quasi-periodic, low-frequency or featureless modulations, which might be related to different origins. During transitions between emission and null states, pulse intensities have diverse tendencies for variation. Significant correlations are found between respectively nulling fraction, nulling cadence, and nulling scale and the energy loss rate of the pulsars. Combined with the nulling fractions reported in the literature for 146 nulling pulsars, we find that statistically large nulling fractions are more tightly related to pulsar period than to characteristic age or energy-loss rate.

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Radio emission features in different modes of PSR J0826+2637 (B0823+26)

Cited by 23 publications

References 61 publications

Periodic Modulation: Newly Emergent Emission Behavior in Pulsars

Periodic Modulation: Newly Emergent Emission Behavior in Pulsars

Periodic mode changing in PSR J1048−5832

Jiamusi pulsar observations

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