  Supermassive black holes disrupt passing stars, producing outbursts called
tidal disruption events (TDEs). TDEs have recently gained attention due to
their unique dynamics and emission processes, which are still not fully
understood. Especially, the so-called optical TDEs, are of interest as they
often exhibit delayed or obscured X-ray emission from the accretion disk,
making the origin of the prompt emission unclear. In this paper, we present
multiband optical polarization observations and optical spectrometry of a
recent TDE candidate AT 2022fpx, alongside monitoring observations in optical,
ultraviolet and X-rays. The optical spectra of AT 2022fpx show Bowen
fluorescence as well as highly-ionized iron emission lines, which are
characteristic of extreme coronal line emitters. Additionally, the source
exhibits variable but low-polarized continuum emission at the outburst peak,
with a clear rotation of the polarization angle. X-ray emission observed
approximately 250 days after the outburst peak in the decay appear flare-like
but is consistent with constant temperature black-body emission. The overall
outburst decay is slower than for typical TDEs, and resembles more the ones
seen from Bowen fluorescence flares. These observations suggest that AT 2022fpx
could be a key source in linking different long-lived TDE scenarios. Its unique
characteristics, such as extreme coronal line emission, variable polarization,
and delayed X-ray flare, can be attributed to the outer shock scenario or a
clumpy torus surrounding the supermassive black hole. Further studies,
especially in the context of multi-wavelength observations, are crucial to
fully understand the dynamics and emission mechanisms of these intriguing
astrophysical events.
