A phase-coherent timing solution for the X-ray dim isolated neutron star

Based on its predominantly thermal X-ray emission and long spin period, the isolated neutron star (INS) $, which best-describes the spin evolution of the source. These parameters imply a dipolar magnetic field strength of 3 . Spectral modelling reveals no significant change in the spectral state over the 15 months of observational monitoring and indicates a thermal luminosity that likely exceeds the rotational energy loss. This suggests a thermal evolution that has been significantly influenced by past reheating. The energy dependence of the double-humped pulse profile closely resembles that observed in the XDINS is one of the most promising candidates for membership in the still small class of X-ray dim isolated neutron stars (XDINSs). Confirmation of this classification, however, requires a more detailed characterisation of the source's timing and spectral properties. In this work, we present new ∋cer observations which, together with previous X-ray follow-up, allow us to constrain the timing properties and long-term evolution of We obtain a coherent timing solution with a spin period of P s s s and a period derivative of dot P 10^ -14 -1 G and a spin-down luminosity of order 10^30 erg s$^ -1 with the pulsed fraction increasing towards higher energies. Taken together, these results unambiguously confirm the XDINS nature of making it the first newly confirmed XDINS in more than two decades.