Borghese, A; Rea, N; Turolla, R; rigoselli, M; alford, J; gotthelf, E; Burgay, M; ... and 11 other authors, .; + view all Borghese, A; Rea, N; Turolla, R; rigoselli, M; alford, J; gotthelf, E; Burgay, M; Possenti, A; Zane, S; and 11 other authors, .; - view fewer (2021) The X-ray evolution and geometry of the > 2018 outburst of XTE J1810-197. Monthly Notices of the Royal Astronomical Society , 504 (4) pp. 5244-5257. 10.1093/mnras/stab1236.

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Abstract

After 15 years, in late 2018, the magnetar XTE J1810–197 underwent a second recorded X-ray outburst event and reactivated as a radio pulsar. We initiated an Xray monitoring campaign to follow the timing and spectral evolution of the magnetar as its flux decays using Swift, XMM–Newton, NuSTAR, and NICER observations. During the year-long campaign, the magnetar reproduced similar behaviour to that found for the first outburst, with a factor of two change in its spin-down rate from ∼ 7.2 × 10−12 s s−1 to ∼ 1.5 × 10−11 s s−1 after two months. Unique to this outburst, we confirm the peculiar energy-dependent phase shift of the pulse profile. Following the initial outburst, the spectrum of XTE J1810–197 is well-modelled by multiple blackbody components corresponding to a pair of non-concentric, hot thermal caps surrounded by a cooler one, superposed to the colder star surface. We model the energy-dependent pulse profile to constrain the viewing and surface emission geometry and find that the overall geometry of XTE J1810–197 has likely evolved relative to that found for the 2003 event.

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