Arthur Suvorov, Universidad de Alicante, Spain — July 14, 2025

Radio surveys are steadily revealing a Galactic population of astrophysical bodies termed 'long-period transients' (LPTs). Although a robust classification for this emerging class has yet to reach consensus, coherent radio pulsations from ~12 ULPs have been detected since the discovery of GLEAM-X J1627. Given spectral similarities in to pulsar emissions, the natural interpretation is that they are slow and magnetised neutron stars (`magnetars'). On the other hand, ULPs exhibit (i) low quiescent X-ray luminosities, (ii) ~hour-long rotational periods, and (iii) highly-variable radio flux. These traits are at odds with properties of Galactic magnetars. However, using state-of-the-art magnetothermal modelling, I will show that these aspects can be naturally incorporated into what we call the "late-blooming magnetar'' scenario by changing the topology of the magnetic field at birth. I'll give a historical overview together with latest details on their properties.