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Most young neutron stars belonging to the class of Central Compact Objects insupernova remnants (CCOs) do not have known periodicities. We investigatedseven such CCOs to understand the common reasons for the absence of detectedpulsations. Making use of XMM-Newton, Chandra, and NICER observations, weperform a systematic timing and spectral analysis to derive updated sensitivitylimits for both periodic signals and multi-temperature spectral components thatcould be associated with radiation from hotspots on the neutron star surface.Based on these limits, we then investigated for each target the allowed viewinggeometry that could explain the lack of pulsations. We estimate it is unlikely($< 10^{-6}$) to attribute that we do not see pulsations to an unfavorableviewing geometry for five considered sources. Alternatively, the carbonatmosphere model, which assumes homogeneous temperature distribution on thesurface, describes the spectra equally well and provides a reasonableinterpretation for the absence of detected periodicities within current limits.The unusual properties of CCOs with respect to other young neutron stars couldsuggest a different evolutionary path, as that proposed for sourcesexperiencing episodes of significant fallback accretion after the supernovaevent.

What causes the absence of pulsations in Central Compact Objects in Supernova Remnants?