2fgl J1653.6–0159: A New Low in Evaporating Pulsar Binary Periods

Romani, Roger W.; Filippenko, A. V.; Cenko, S. Bradley

doi:10.1088/2041-8205/793/1/l20

Cited by 38 publications

(45 citation statements)

References 19 publications

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“…For comparison, the densest known black-widow companions have densities of around 50 g cm −3 (e.g. PSR J0636+5128 Kaplan et al 2018), with the record being that of the blackwidow candidate 3FGL J1653.6−0158 in a 75-min orbit (Romani et al 2014) where ρ 70 g cm −3 . These objects have been proposed to be the descendants of ultra-compact X-ray binaries, but this origin is unlikely for PSR J0952−0607 given its much longer orbital period (van Haaften et al 2012).…”

Section: Discussionmentioning

confidence: 99%

Detection and Timing of Gamma-Ray Pulsations from the 707 Hz Pulsar J0952−0607

Nieder

Clark

Bassa

et al. 2019

ApJ

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The Low-Frequency Array radio telescope discovered the 707 Hz binary millisecond pulsar (MSP) J0952−0607 in a targeted radio pulsation search of an unidentified Fermi gamma-ray source. This source shows a weak energy flux of F γ = 2.6 × 10 −12 erg cm −2 s −1 in the energy range between 100 MeV and 100 GeV. Here we report the detection of pulsed gamma-ray emission from PSR J0952−0607 in a very sensitive gamma-ray pulsation search. The pulsar's rotational, binary, and astrometric properties are measured over seven years of Fermi-Large Area Telescope data. For this we take into account the uncertainty on the shape of the gamma-ray pulse profile. We present an updated radio-timing solution now spanning more than two years and show results from optical modeling of the black-widow-type companion based on new multi-band photometric data taken with HiPERCAM on the Gran Telescopio Canarias on La Palma and ULTRACAM on the New Technology Telescope at ESO La Silla a) . PSR J0952−0607 is now the fastest-spinning pulsar for which the intrinsic spindown rate has been reliably constrained (Ṗ int 4.6 × 10 −21 s s −1 ). The inferred surface magnetic field strength of B surf 8.2 × 10 7 G is among the ten lowest of all known pulsars. This discovery is another example of an extremely fast spinning black-widow pulsar hiding within an unidentified Fermi gamma-ray source. In the future such systems might help to pin down the maximum spin frequency and the minimum surface magnetic field strength of MSPs.

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Section: Discussionmentioning

confidence: 99%

Detection and Timing of Gamma-Ray Pulsations from the 707 Hz Pulsar J0952−0607

Nieder

Clark

Bassa

et al. 2019

ApJ

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“…There are other systems that have been proposed as possible redbacks, but for which the weight of the evidence currently suggests they are better classified as black widow systems, such as 2FGL J1653.6-0159 (Romani et al 2014;Kong et al 2014). These are not included at present, but could be reclassified with future data.…”

Section: Defining the Redback Samplementioning

confidence: 99%

Optical Spectroscopy and Demographics of Redback Millisecond Pulsar Binaries

Strader¹,

Swihart²,

Chomiuk³

et al. 2019

ApJ

121

138

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We present the first optical spectroscopy of five confirmed (or strong candidate) redback millisecond pulsar binaries, obtaining complete radial velocity curves for each companion star. The properties of these millisecond pulsar binaries with low-mass, hydrogen-rich companions are discussed in the context of the 14 confirmed and 10 candidate field redbacks. We find that the neutron stars in redbacks have a median mass of 1.78 ± 0.09M with a dispersion of σ = 0.21 ± 0.09. Neutron stars with masses in excess of 2M are consistent with, but not firmly demanded by, current observations. Redback companions have median masses of 0.36 ± 0.04M with a scatter of σ = 0.15 ± 0.04M , and a tail possibly extending up to 0.7-0.9M . Candidate redbacks tend to have higher companion masses than confirmed redbacks, suggesting a possible selection bias against the detection of radio pulsations in these more massive candidate systems. The distribution of companion masses between redbacks and the less massive black widows continues to be strongly bimodal, which is an important constraint on evolutionary models for these systems. Among redbacks, the median efficiency of converting the pulsar spindown energy to γ-ray luminosity is ∼ 10%.

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“…Candidate X-ray counterparts to 3FGL J1653.6−0158 were found by Cheung et al (2012) using a Chandra-ACIS 21 ks observation (OBSID 11787). An optical follow-up of the 3FGL J1653.6−0158 field by Romani et al (2014) led to the discovery of a periodic flux modulation (0.052 d) in the optical counterpart to the brightest of the Chandra sources, making a case for a new binary MSP identified through the detection of an optical periodicity, also in this case a likely RB. The periodicity was also found in the Catalina data, allowing Romani et al (2014) to extend the time baseline for the period determination.…”

Section: Fgl J16536−0158mentioning

confidence: 99%

A multiwavelength investigation of candidate millisecond pulsars in unassociated γ-ray sources

Salvetti

Mignani

Luca

et al. 2017

Monthly Notices of the Royal Astronomical Society

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About one third of the 3033 γ-ray sources in the Third Fermi-LAT Gamma-ray Source Catalogue (3FGL) are unidentified and do not have even a tentative association with a known object, hence they are defined as unassociated. Among Galactic γ-ray sources, pulsars represent the largest class, with over 200 identifications to date. About one third of them are milli-second pulsars (MSPs) in binary systems. Therefore, it is plausible that a sizeable fraction of the unassociated Galactic γ-ray sources belong to this class. We collected X-ray and optical observations of the fields of twelve unassociated Fermi sources that have been classified as likely MSPs according to statistical classification techniques. To find observational support for the proposed classification, we looked for periodic modulations of the X-ray and optical flux of these sources, which could be associated with the orbital period of a MSP in a tight binary system. Four of the observed sources were identified as binary MSPs, or proposed as high-confidence candidates, while this work was in progress. For these sources, we present the results of our follow-up investigations, whereas for the others we present possible evidence of new MSP identifications. In particular, we discuss the case of 3FGL J0744.1−2523 that we proposed as a possible binary MSP based upon the preliminary detection of a 0.115 d periodicity in the flux of its candidate optical counterpart. We also found very marginal evidence of periodicity in the candidate optical counterpart to 3FGL J0802.3−5610, at a period of 0.4159 d, which needs to be confirmed by further observations.

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2fgl J1653.6–0159: A New Low in Evaporating Pulsar Binary Periods

Cited by 38 publications

References 19 publications

Detection and Timing of Gamma-Ray Pulsations from the 707 Hz Pulsar J0952−0607

Detection and Timing of Gamma-Ray Pulsations from the 707 Hz Pulsar J0952−0607

Optical Spectroscopy and Demographics of Redback Millisecond Pulsar Binaries

A multiwavelength investigation of candidate millisecond pulsars in unassociated γ-ray sources

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