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We present results of the first dedicated observation of the young X-raypulsar SXP 1062 in the broad X-ray energy band obtained during its 2019outburst with the NuSTAR and XMM-Newton observatories. The analysis of thepulse-phase averaged and phase-resolved spectra in the energy band from 0.5 to70 keV did not reveal any evidence for the presence of a cyclotron line. Thespin period of the pulsar was found to have decreased to 979.48+/-0.06 simplying a ~10% reduction compared to the last measured period during themonitoring campaign conducted about five years ago, and is puzzling consideringthat the system apparently did not show major outbursts ever since. The switchof the pulsar to the spin-up regime supports the common assumption that torquesacting on the accreting neutron star are nearly balanced and thus SXP 1062likely also spins with a period close to the equilibrium value for this system.The current monitoring of the source revealed also a sharp drop of its softX-ray flux right after the outburst, which is in drastic contrast to thebehaviour during the previous outburst when the pulsar remained observable foryears with only a minor flux decrease after the end of the outburst. Thisunexpected off state of the source lasted for at most 20 days after which SXP1062 returned to the level observed during previous campaigns. We discuss thisand other findings in context of the modern models of accretion onto stronglymagnetized neutron stars.

The unusual behaviour of the young X-ray pulsar SXP 1062 during the 2019 outburst