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Recent detections of optical pulsations from both a transitional and an accreting millisecond pulsar have revealed unexpectedly bright signals, suggesting that the presence of an accretion disk enhances the efficiency of optical emission,…

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…

High Energy Astrophysical Phenomena · Physics 2022-07-19 J. P. Halpern

We present an analysis of the spin and orbital properties of the newly discovered accreting pulsar IGR J17480-2446, located in the globular cluster Terzan 5. Considering the pulses detected by the Rossi X-ray Timing Explorer at a period of…

High Energy Astrophysical Phenomena · Physics 2015-05-20 A. Papitto , A. D'Ai' , S. Motta , A. Riggio , L. Burderi , T. Di Salvo , T. Belloni , R. Iaria

In a search of the unidentified Fermi gamma-ray source 3FGL J1417.5-4402 with the Parkes radio telescope, we discovered PSR J1417-4402, a 2.66 ms pulsar having the same 5.4 day orbital period as the optical and X-ray binary identified by…

Solar and Stellar Astrophysics · Physics 2016-03-23 F. Camilo , J. E. Reynolds , S. M. Ransom , J. P. Halpern , S. Bogdanov , M. Kerr , P. S. Ray , J. M. Cordes , J. Sarkissian , E. D. Barr , E. C. Ferrara

We present timing solutions for four pulsars discovered in the Green Bank Northern Celestial Cap (GBNCC) survey. All four pulsars are isolated with spin periods between 0.26$\,$s and 1.84$\,$s. PSR J0038$-$2501 has a 0.26$\,$s period and a…

A search was carried out for pulsars with periods (P) from 2 to 90 s in daily observations carried out over an interval of 5 years in a area measuring 6300 sq.deg. The data was obtained on a Large Phased Array (LPA) at a frequency of 111…

High Energy Astrophysical Phenomena · Physics 2025-04-22 S. A. Tyul'bashev , G. E. Tyul'basheva

PSR J1738+0333 is one of the four millisecond pulsars known to be orbited by a white dwarf companion bright enough for optical spectroscopy. Of these, it has the shortest orbital period, making it especially interesting for a range of…

High Energy Astrophysical Phenomena · Physics 2012-07-11 J. Antoniadis , M. H. van Kerkwijk , D. Koester , P. C. C. Freire , N. Wex , T. M. Tauris , M. Kramer , C. G. Bassa

We report on the timing analysis of the 2015 outburst of the intermittent accreting millisecond X-ray pulsar SAX J1748.9-2021 observed on March 4 by the X-ray satellite XMM-Newton. By phase-connecting the time of arrivals of the observed…

High Energy Astrophysical Phenomena · Physics 2016-04-20 A. Sanna , L. Burderi , A. Riggio , F. Pintore , T. Di Salvo , A. F. Gambino , R. Iaria , M. Matranga , F. Scarano

We report the discovery of a new 5.78 ms-period millisecond pulsar (MSP), PSR J1740-5340B (NGC 6397B), in an eclipsing binary system discovered with the Parkes radio telescope (now also known as Murriyang), Australia, and confirmed with the…

We present the discovery of five millisecond pulsars (MSPs) from the PALFA Galactic plane survey using Arecibo. Four of these (PSRs J0557+1551, J1850+0244, J1902+0300, and J1943+2210) are binary pulsars whose companions are likely white…

We report on the optical identification of the companion star to the eclipsing millisecond pulsar PSR J1824-2452H in the galactic globular cluster M28 (NGC 6626). This star is at only 0.2" from the nominal position of the pulsar and it…

Solar and Stellar Astrophysics · Physics 2015-05-20 C. Pallanca , E. Dalessandro , F. R. Ferraro , B. Lanzoni , R. T. Rood , A. Possenti , N. D'Amico , P. C. Freire , I. Stairs , S. M. Ransom , S. Begin

XSS J12270-4859 is an X-ray binary associated with the Fermi LAT gamma-ray source 1FGL J1227.9-4852. In 2012 December, this source underwent a transition where the X-ray and optical luminosity dropped and the spectral signatures of an…

We present an evolutionary scenario for the spin-up and evolution of binary millisecond pulsars, according to which the companion of the pulsar PSR J 1740-5340, recently discovered as a binary with orbital period of 32.5 hr in the Globular…

Astrophysics · Physics 2009-11-07 Luciano Burderi , Francesca D'Antona , Marta Burgay

We report the discovery of the first millisecond pulsar with a pulsating white dwarf companion. Following the recent discoveries of pulsations in extremely low-mass (ELM, <0.3 Msol) white dwarfs (WDs), we targeted ELM WD companions to two…

Solar and Stellar Astrophysics · Physics 2015-06-23 Mukremin Kilic , J. J. Hermes , A. Gianninas , Warren R. Brown

The millisecond pulsar(MSP) is believed to be an old neutron star(NS) having undergone spin-up by the accreting material from the donor. Whereas, the discovery of eccentric millisecond pulsars (eMSPs) in the Galactic field challenges such a…

Solar and Stellar Astrophysics · Physics 2023-10-24 D. Wang , B. P. Gong

We observe systematic profile changes in the visible pulsar of the compact double neutron star system PSR~J1946+2052 using observations with the Five-hundred-meter Aperture Spherical radio Telescope (FAST). The interpulse of PSR~J1946+2052…

The velocity and density distribution of $e^\pm$ in the pulsar wind are crucial distinction among magnetosphere models, and contains key parameters determining the high energy emission of pulsar binaries. In this work, a direct method is…

High Energy Astrophysical Phenomena · Physics 2017-10-11 Shu-Xu Yi , K. S. Cheng

Over the summer of 2007, we obtained 1191 hours of `drift-scan' pulsar search observations with the Green Bank Telescope at a radio frequency of 350 MHz. Here we describe the survey setup, search procedure, and the discovery and follow-up…

We present evidence for a small glitch in the spin evolution of the millisecond pulsar J0613$-$0200, using the EPTA Data Release 1.0, combined with Jodrell Bank analogue filterbank TOAs recorded with the Lovell telescope and Effelsberg…

The Fermi Large Area Telescope gamma-ray source 3FGL J2039.6$-$5618 contains a periodic optical and X-ray source that was predicted to be a "redback" millisecond pulsar (MSP) binary system. However, the conclusive identification required…