Fast transitions between single and double-peaked optical pulse profiles of millisecond pulsar J1023$+$0038
September 16, 2022
We report some results of optical observations of the transitional millisecond pulsar PSR J1023+0038,
performed with the multi-channel panoramic photometer-polarimeter mounted on the 6-meter BTA telescope.
The setup allowed us to register photons simultaneously in two channels (``red'' and ``blue'')
with the effective temporal resolution of about 1 $\mu$s. We detected optical pulsations at the
pulsar frequency with characteristics similar to the ones reported in other studies. In addition,
during one of the nights we observed dramatic change in the pulse profile structure, mainly characterized
by fast transition from double-peaked to single-peaked shape and back, and accompanied by flaring activity
of the system. We analyse the results and discuss some aspects of their physical interpretation regarding
the origin of the pulsing emission.
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