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X-ray observations reveiled a group of radio-silent isolated neutron stars(INSs) at the centre of young supernova remnants (SNRs), dubbed central compactobjects or CCOs, with properties different from those of classicalrotation-powered pulsars. In at least three cases, evidence points towards CCOsbeing low-magnetized INSs, born with slow rotation periods, and possiblyaccreting from a debris disc of material formed out of the supernova event.Understanding the origin of the diversity of the CCOs can shed light onsupernova explosion and neutron star formation models. Optical/infrared (IR)observations are crucial to test different CCO interpretations. The aim of ourwork is to perform a deep optical investigation of the CCO RX J0822.0-4300 inthe Puppis A SNR, one of the most poorly understood in the CCO family. By usingas a reference the Chandra X-ray coordinates of RX J0822.0-4300, we performeddeep optical observations in the B, V and I bands with the Very Large Telescope(VLT). We found no candidate optical counterpart within 3 sigma of the computedChandra X-ray position down to 5 sigma limits of B~27.2, V~26.9, and I~25.6,the deepest obtained in the optical band for this source. These limits confirmthe non-detection of a companion brighter than an M5 dwarf. At the same time,they do not constrain optical emission from the neutron star surface, whileemission from the magnetosphere would require a spectral break in theoptical/IR.

Deep optical observations of the central X-ray source in the Puppis A supernova remnant