The variable spin-down rate of the transient magnetar XTE J1810-197

Fabio Pintore, Federico Bernardini, Sandro Mereghetti, Paolo Esposito, Roberto Turolla, Nanda Rea, Francesco Coti Zelati, Gian Luca Israel, Andrea Tiengo, Silvia Zane

    Research output: Contribution to journalArticlepeer-review


    We have analysed XMM-Newton and Chandra observations of the transient magnetar XTE J1810-197 spanning more than 11 yr, from the initial phases of the 2003 outburst to the current quiescent level. We investigated the evolution of the pulsar spin period and we found evidence for two distinct regimes: during the outburst decay, v˙ was highly variable in the range -(2-4.5) × 10-13 Hz s-1, while during quiescence the spin-down rate was more stable at an average value of -1 × 10-13 Hz s-1. Only during ~3000 d (from MJD 54165 to MJD 56908) in the quiescent stage it was possible to find a phase-connected timing solution, with v˙ =-4.9 × 10-14 Hz s-1, and a positive second frequency derivative, v =1.8 × 10-22 Hz s-2. These results are in agreement with the behaviour expected if the outburst of XTE J1810-197 was due to a strong magnetospheric twist.

    Original languageEnglish (US)
    Pages (from-to)2088-2093
    Number of pages6
    JournalMonthly Notices of the Royal Astronomical Society
    Issue number2
    StatePublished - Mar 2 2016


    • Magnetic fields
    • Pulsars: Individual: (XTE J1810-197)
    • Stars: Magnetars
    • Stars: Neutron
    • X-rays: Stars

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science


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