Green Bank Telescope Discovery of the Redback Binary Millisecond Pulsar PSR J0212+5321

Perez, Karen I.; Bogdanov, Slavko; Halpern, J. P.; Gajjar, Vishal

doi:10.3847/1538-4357/acdc23

Cited by 4 publications

(4 citation statements)

References 85 publications

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“…Future Compton polarimeters that are sensitive to hard X-rays and low-energy gamma-rays (Lei et al 1997) may also probe the cooled population and possibly the exponential tail, especially given the expected increasingly high polarization. NuSTAR hard X-ray observations of some redbacks have shown a double-peak structure consistent with the IBS (e.g., Kong et al 2018;Perez et al 2023), making targeted polarization measurements of the IBS in this band appealing.…”

Section: Discussionmentioning

confidence: 99%

“…At the shock, magnetic reconnection likely occurs, accelerating shocked particles; a residual magnetic field remains in the IBS after the stripes are annihilated (Lyubarsky 2003;Pétri & Lyubarsky 2007;Sironi & Spitkovsky 2011). The very hard spectra observed in spiders (i.e., Γ x ≈ 1; Bogdanov et al 2014;Kandel et al 2021;Perez et al 2023) support this picture (Cortés & Sironi 2022;Zhang et al 2023). The toroidal field remaining after the annihilation of the pulsar wind represents a promising candidate for the magnetic field geometry, but postshock dynamics such as turbulence may produce differently ordered fields (e.g., Goldsmith & Pittard 2016).…”

Section: Magnetic Field Geometrymentioning

confidence: 99%

“…Synchrotron emission from organized fields is polarized. While analyses of the synchrotron X-ray light curve and of the spectrum have been conducted on a number of redbacks and black widows (e.g., Gentile et al 2014;Romani & Sanchez 2016;Kandel et al 2019Kandel et al , 2021Perez et al 2023), the X-ray polarization of these sources has not yet been studied. New X-ray capabilities such as the Imaging X-ray Polarization Explorer (IXPE; Weisskopf et al 2016Weisskopf et al , 2022 may make this possible, affording new information on the magnetic field geometry of the IBS.…”

Section: Introductionmentioning

confidence: 99%

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Polarization of Intrabinary Shock Emission in Spider Pulsars

Sullivan,

Romani

2023

ApJ

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In so-called spider pulsars, the X-ray band is dominated by intrabinary shock (IBS) synchrotron emission. While the double-peaked X-ray light curves from these shocks have been well characterized in several spider systems (both black widows and redbacks), the polarization of this emission is yet to be studied. Motivated by the new polarization capability of the Imaging X-ray Polarization Explorer and the confirmation of highly ordered magnetic fields in pulsar wind nebulae, we model the IBS polarization by employing two potential magnetic field configurations: toroidal magnetic fields imposed by the preshock pulsar wind, and tangential shock-generated fields that follow the postshock flow. We find that if IBSs host ordered magnetic fields, the synchrotron X-rays from spider binaries can display a high degree of polarization (≳50%), while the variation in polarization angle provides a good probe of the binary geometry and the magnetic field structure. Our results encourage observational polarization studies of spider pulsars that can distinguish the proposed magnetic models and that constrain the unique properties of these systems better.

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Section: Discussionmentioning

confidence: 99%

Section: Magnetic Field Geometrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Polarization of Intrabinary Shock Emission in Spider Pulsars

Sullivan,

Romani

2023

ApJ

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“…Note added in proof Perez et al (2023). discovered a 2.11 ms pulsar at the position of 4FGL J0212.1+5321.…”

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confidence: 99%

The Third Fermi Large Area Telescope Catalog of Gamma-Ray Pulsars

Smith,

Abdollahi,

Ajello

et al. 2023

ApJ

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We present 294 pulsars found in GeV data from the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope. Another 33 millisecond pulsars (MSPs) discovered in deep radio searches of LAT sources will likely reveal pulsations once phase-connected rotation ephemerides are achieved. A further dozen optical and/or X-ray binary systems colocated with LAT sources also likely harbor gamma-ray MSPs. This catalog thus reports roughly 340 gamma-ray pulsars and candidates, 10% of all known pulsars, compared to ≤11 known before Fermi. Half of the gamma-ray pulsars are young. Of these, the half that are undetected in radio have a broader Galactic latitude distribution than the young radio-loud pulsars. The others are MSPs, with six undetected in radio. Overall, ≥236 are bright enough above 50 MeV to fit the pulse profile, the energy spectrum, or both. For the common two-peaked profiles, the gamma-ray peak closest to the magnetic pole crossing generally has a softer spectrum. The spectral energy distributions tend to narrow as the spindown power E ̇ decreases to its observed minimum near 1033 erg s−1, approaching the shape for synchrotron radiation from monoenergetic electrons. We calculate gamma-ray luminosities when distances are available. Our all-sky gamma-ray sensitivity map is useful for population syntheses. The electronic catalog version provides gamma-ray pulsar ephemerides, properties, and fit results to guide and be compared with modeling results.

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A Gaia view of the optical and X-ray luminosities of compact binary millisecond pulsars

Koljonen,

Linares

2023

Monthly Notices of the Royal Astronomical Society

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In this paper, we study compact binary millisecond pulsars with low- and very low-mass companion stars (spiders) in the Galactic field, using data from the latest Gaia data release (DR3). We infer the parallax distances of the optical counterparts to spiders, which we use to estimate optical and X-ray luminosities. We compare the parallax distances to those derived from radio pulse dispersion measures and find that they have systematically larger values, by 40% on average. We also test the correlation between X-ray and spin-down luminosities, finding that most redbacks have a spin-down to X-ray luminosity conversion efficiency of ∼0.1%, indicating a contribution from the intrabinary shock. On the other hand, most black widows have an efficiency of ∼0.01%, similar to the majority of the pulsar population. Finally, we find that the bolometric optical luminosity significantly correlates with the orbital period, with a large scatter due to different irradiated stellar temperatures and binary properties. We interpret this correlation as the effect of the increasing size of the Roche Lobe radius with the orbital period. With this newly found correlation, an estimate of the optical magnitude can be obtained from the orbital period and a distance estimate.

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Green Bank Telescope Discovery of the Redback Binary Millisecond Pulsar PSR J0212+5321

Cited by 4 publications

References 85 publications

Polarization of Intrabinary Shock Emission in Spider Pulsars

Polarization of Intrabinary Shock Emission in Spider Pulsars

The Third Fermi Large Area Telescope Catalog of Gamma-Ray Pulsars

A Gaia view of the optical and X-ray luminosities of compact binary millisecond pulsars

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