Transitional Millisecond Pulsars

Papitto, A.; Martino, D. de

doi:10.1007/978-3-030-85198-9_6

Cited by 31 publications

(22 citation statements)

References 189 publications

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“…Low-B-field pulsars with slightly longer periods may also have been recycled, albeit "mildly." There are also 20 accretion-powered MSPs known as of 2020 (Papitto & de Martino 2022), all in X-ray transient systems with orbital periods <1 day, that may eventually become radio MSPs.…”

Section: Introductionmentioning

confidence: 99%

“…There are an additional five putative tMSPs identified whose spin periods are not yet known because they have not yet been observed in a pulsar state (Bogdanov & Halpern 2015;Strader et al 2016;Miller et al 2020;Coti Zelati et al 2021;Strader et al 2021). See Papitto & de Martino (2022) for a review of tMSPs, their accretion physics, and their relation to redbacks.…”

Section: Introductionmentioning

confidence: 99%

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Luminous Optical and X-Ray Flaring of the Putative Redback Millisecond Pulsar 1FGL J0523.5–2529

Halpern

Perez

Bogdanov

2022

ApJ

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Several redback and black widow millisecond pulsar binaries have episodes of flaring in X-rays and optical. We initially detected such behavior from the Fermi selected redback candidate 1FGL J0523.5–2529 during optical time-series monitoring. Triggered observations with the Neil Gehrels Swift Observatory over the next ≈100 days showed episodic flaring in X-rays with luminosity up to 8 × 1033 erg s−1 (∼100 times the minimum), and a comparable luminosity in the optical/UV, with similar power-law spectra of f ν ∝ ν −0.7. These are the most luminous flares seen in any nonaccreting “spider” pulsar system, which may be related to the large size of the companion through the fraction of the pulsar wind that it or its ablated wind intercepts. Simultaneously with an optical flare, we see Balmer line and He i emission, not previously known in this object, which is evidence of a stellar wind that may also inhibit detection of radio pulsations. The quiescent optical light curves, while dominated by ellipsoidal modulation, show evidence of variable nonuniform temperature that could be due either to large starspots or asymmetric heating of the companion by the pulsar. This may explain a previous measurement of unusual nonzero orbital eccentricity as, alternatively, distortion of the radial-velocity curve by the surface temperature distribution of the large companion.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Luminous Optical and X-Ray Flaring of the Putative Redback Millisecond Pulsar 1FGL J0523.5–2529

Halpern

Perez

Bogdanov

2022

ApJ

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“…There are additional tMSP candidates whose spin periods are not known because they have not yet been seen in a radio pulsar state. See Papitto & de Martino (2022) for a review of tMSPs, their accretion physics, and their relation to redbacks.…”

Section: Introductionmentioning

confidence: 99%

Optical Light Curve of 4FGL J0935.3+0901: A Flaring Black Widow Candidate

Halpern

2022

ApJL

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I obtained time-series photometry of the compact binary candidate for the Fermi source 4FGL J0935.3+0901. Superposed on the 2.44 hr orbital modulation are day-to-day variations and frequent flaring as seen in several redback and black widow millisecond pulsars (MSPs). The short orbital period favors a black widow. While the modulation of ≤1 mag is smaller than that of most black widows, it could indicate a low orbital inclination. Although a published optical spectrum shows strong emission lines, the light curve evinces pulsar heating of the companion star rather than accretion-disk emission of a transitional MSP. Emission lines and flaring occur in the same objects, probably powered by shocks between the relativistic pulsar wind and a wind driven off the companion star. I also recovered the period in photometry from the Zwicky Transient Facility (ZTF). A phase-connected ephemeris derived from MDM Observatory and ZTF data spanning 4 yr yields a period of 0.10153276(36) days and an epoch for the ascending node of the putative pulsar.

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“…With almost known spin period, it's helpful to perform exhaustive searching the coherent pulsation from the persistent emissions with reduced parameter spaces when the outburst stops (e.g., Strohmayer et al 2018). In addition, radio observations are highly encouraged to carry out, to search for the coherent radio pulsation and catch the possible transition from accretion-powered to rotation-powered states, when the source evolves into the X-ray quiescent state (see Papitto & de Martino 2022).…”

Section: Discussionmentioning

confidence: 99%

Discovery of a 584.65 Hz Burst Oscillation in the Low Mass X-Ray Binary 4U 1730$-$22

Li¹,

Yu²,

Lu³

et al. 2022

Preprint

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Type-I X-ray burst oscillations are powered by thermonuclear released on the neutron star (NS) surface in low mass X-ray binaries (LMXBs), where the burst oscillation frequencies are close to the NS spin rates. In this work, we report the detection of oscillation at 584.65 Hz during the cooling tail of a type-I X-ray bursts observed from the accreting NS LMXB 4U 1730-22 in 2022 March 20, by the Neutron star Interior Composition Explorer (NICER) telescope. The oscillation signal showed a strong Leahy power, P m ∼ 54.04, around 584.65 Hz, which has single trial and multiple trials confidence levels of 7.05σ and 4.78σ, respectively. The folded pulse profile of the oscillation in the 0.2-10 keV band showed a sinusoidal shape with the fraction amplitude rms of (12.5 ± 1.8)%. We found the oscillation frequency showed insignificant upward drifting, i.e., less than 0.3 Hz, during the cooling tail, similar as the behavior appearing in accreting millisecond X-ray pulsars (AMXP), and indicate the source could be an AMXP spinning at 1.71 ms.

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Transitional Millisecond Pulsars

Cited by 31 publications

References 189 publications

Luminous Optical and X-Ray Flaring of the Putative Redback Millisecond Pulsar 1FGL J0523.5–2529

Luminous Optical and X-Ray Flaring of the Putative Redback Millisecond Pulsar 1FGL J0523.5–2529

Optical Light Curve of 4FGL J0935.3+0901: A Flaring Black Widow Candidate

Discovery of a 584.65 Hz Burst Oscillation in the Low Mass X-Ray Binary 4U 1730$-$22

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