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We report 21-yr timing of one of the most precise pulsars: PSR J1713+0747. Its pulse times of arrival are well modeled by a comprehensive pulsar binary model including its three-dimensional orbit and a noise model that incorporates…

We report observed and derived timing parameters for three millisecond pulsars (MSPs) from observations collected with the Parkes 64-m telescope, Murriyang. The pulsars were found during re-processing of archival survey data by Mickaliger…

The double pulsar system PSR J0737-3039A/B is a double neutron star binary, with a 2.4-hour orbital period, which has allowed measurement of relativistic orbital perturbations to high precision. The low mass of the second-formed neutron…

We report on an {unusually} bright observation of PSR J1720$-$0533 using the Five-hundred-meter Aperture Spherical radio Telescope (FAST). The pulsar is in a black widow system that {was discovered by the Commensal Radio Astronomy FAST…

High Energy Astrophysical Phenomena · Physics 2021-11-24 S. Q. Wang , J. B. Wang , N. Wang , J. M. Yao , G. Hobbs , S. Dai , F. F. Kou , C. C. Miao , D. Li , Y. Feng , S. J. Dang , D. H. Wang , P. Wang , J. P. Yuan , C. M. Zhang , L. Zhang , S. B. Zhang , W. W. Zhu

PSR J1906+0746 is a young pulsar in the relativistic binary with the second-shortest known orbital period, of 3.98 hours. We here present a timing study based on five years of observations, conducted with the 5 largest radio telescopes in…

We provide an update on the ongoing monitoring and study of the highly-relativistic double neutron star binary system PSR J1757-1854, a 21.5-ms pulsar in a highly eccentric, 4.4-hour orbit. The extreme nature of this pulsar's orbit allows…

We present the results of Green Bank Telescope (GBT) observations of two pulsars discovered with the Five-hundred-meter Aperture Spherical Radio Telescope (FAST) during the 19-beam Commensal Radio Astronomy FasT Survey (CRAFTS). We…

High Energy Astrophysical Phenomena · Physics 2026-04-09 Victoria A. Blackmon , Maura A. McLaughlin , De Zhao , Jianping Yuan , Qingdong Wu , Chen-Chen Miao , Meng-Yao Xue , Di Li , Wei-Wei Zhu

We report on the optical identification of the companion to the eclipsing millisecond pulsar PSR J1701$-$3006B in the globular cluster NGC 6266. A relatively bright star with an anomalous red colour and an optical variability ($\sim$ 0.2…

Astrophysics · Physics 2009-11-13 G. Cocozza , F. R. Ferraro , A. Possenti , G. Beccari , B. Lanzoni , S. Ranson , R. T. Rood , N. D'Amico

The radio millisecond pulsar PSR B1620-26 is part of an extraordinary triple star system in the globular cluster M4. The inner companion to the neutron star is thought to be a white dwarf of mass m1 ~0.3 Msun in an orbit of period ~0.5…

Astrophysics · Physics 2007-05-23 F. A. Rasio

We report on Keck and Hubble Space Telescope optical observations of the eclipsing binary pulsar system PSR B1718-19, in the direction of the globular cluster NGC 6342. These reveal a faint star ($m_{\rm F702W}=25.21\pm0.07$; Vega system)…

Astrophysics · Physics 2009-10-31 M. H. van Kerkwijk , V. M. Kaspi , A. R. Klemola , S. R. Kulkarni , A. G. Lyne , D. Van Buren

The Galactic Center is host to a population of extraordinary radio filaments, thin linear structures that trace out magnetic field lines running perpendicular to the Galactic plane. Using Murriyang, the 64 m Parkes radio telescope, we…

High Energy Astrophysical Phenomena · Physics 2024-05-08 Marcus E. Lower , Shi Dai , Simon Johnston , Ewan D. Barr

We have discovered two recycled pulsars in relativistic orbits as part of the first high-frequency survey of intermediate Galactic latitudes. PSR J1157-5112 is a 44 ms pulsar and the first recycled pulsar with an ultra-massive (M > 1.14 Mo)…

Astrophysics · Physics 2009-10-31 R. T. Edwards , M. Bailes

The millisecond pulsar PSR J1740-5340 in the globular cluster NGC 6397 shows radio eclipses over ~40% of its binary orbit. A first Chandra observation revealed indications for the X-ray flux being orbit dependent as well. In this work we…

High Energy Astrophysical Phenomena · Physics 2015-05-14 R. H. H. Huang , W. Becker

We report on the discovery of coherent pulsations at a period of 2.9 ms from the X-ray transient MAXI J0911-655 in the globular cluster NGC 2808. We observed X-ray pulsations at a frequency of $\sim339.97$ Hz in three different observations…

High Energy Astrophysical Phenomena · Physics 2017-02-01 A. Sanna , A. Papitto , L. Burderi , E. Bozzo , A. Riggio , T. Di Salvo , C. Ferrigno , N. Rea , R. Iaria

We report on nine years of timing observations of PSR J2019+2425, a millisecond pulsar in a wide 76.5 day orbit with a white dwarf. We measure a significant change over time of the projected semi-major axis of the orbit,…

Astrophysics · Physics 2009-10-31 David J. Nice , Eric M. Splaver , Ingrid H. Stairs

We report the discovery of the first radio pulsar associated with NGC 6712, an eclipsing black widow (BW) pulsar, J1853$-$0842A, found by high-sensitivity searches using the Five-hundred-meter Aperture Spherical radio Telescope. This 2.15…

High Energy Astrophysical Phenomena · Physics 2021-11-17 Zhen Yan , Zhi-chen Pan , Scott M. Ransom , Duncan R. Lorimer , Lei Qian , Pei Wang , Zhi-qiang Shen , Di Li , Peng Jiang , Jin-Tao Luo , Jie Liu , Zhi-peng Huang

We present the discovery of PSR J1728-4608, a new redback spider pulsar identified in images from the Australian SKA Pathfinder telescope. PSR J1728-4608 is a millisecond pulsar with a spin period of 2.86 ms, in a 5.05 hr orbit with a…

High Energy Astrophysical Phenomena · Physics 2025-12-11 F. Petrou , Y. Wang , N. Hurley-Walker , S. McSweeney , L. Zhang , R. G. Key , J. Freeburn , B. W. Meyers , David L. Kaplan , A. Zic , Tara Murphy , D. Dobie , Y. Maan

Exploiting a five-year span of data, we present improved timing solutions for the five millisecond pulsars known in the globular cluster NGC 6752. They include proper motion determinations for the two outermost pulsars in the cluster, PSR…

To understand the nature of supernovae and neutron star (NS) formation, as well as binary stellar evolution and their interactions, it is important to probe the distribution of NS masses. Until now, all double NS (DNS) systems have been…

High Energy Astrophysical Phenomena · Physics 2018-04-04 J. G. Martinez , K. Stovall , P. C. C. Freire , J. S. Deneva , F. A. Jenet , M. A. McLaughlin , M. Bagchi , S. D. Bates , A. Ridolfi

Many physically motivated extensions to general relativity (GR) predict significant deviations in the properties of spacetime surrounding massive neutron stars. We report the measurement of a 2.01 +/- 0.04 solar mass pulsar in a 2.46-hr…