The disturbance of a millisecond pulsar magnetosphere

Ryan M Shannon, Lindley Lentati, Matthew Kerr, Matthew Bailes, N. D R Bhat, William A Coles, Shi Dai, James Dempsey, George B Hobbs, Miranda J Keith-Roach, Yuri Levin, Richard Norman Manchester, S. Osłowski, Vikram Ravi, Daniel Reardon, Pablo Rosado, Renee Spiewak, Willem van Straten, Lawrence Toomey, J.-B. WangLi Wen, X. P. You, Xing Jiang Zhu

Research output: Contribution to journalArticleResearchpeer-review

23 Citations (Scopus)


Pulsar timing has enabled some of the strongest tests of fundamental physics. Central to the technique is the assumption that the detected radio pulses can be used to accurately measure the rotation of the pulsar. Here, we report on a broadband variation in the pulse profile of the millisecond pulsar J1643-1224. A new component of emission suddenly appears in the pulse profile, decays over four months, and results in a permanently modified pulse shape. Profile variations such as these may be the origin of timing noise observed in other millisecond pulsars. The sensitivity of pulsar-timing observations to gravitational radiation can be increased by accounting for this variability.

Original languageEnglish
Article numberL1
Number of pages6
JournalThe Astrophysical Journal Letters
Issue number1
Publication statusPublished - 1 Sep 2016


  • pulsars: general
  • pulsars: individual (PSR J16431224)
  • stars: neutron

Cite this