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1E 1207.4-5209, the peculiar Central Compact object in the G296.5+10.0supernova remnant, has been proposed to be an "anti-magnetar" - a young neutronstar born with a weak dipole field. Accretion, possibly of supernova fallbackmaterial, has also been invoked to explain a large surface temperatureanisotropy as well as the generation of peculiar cyclotron absorption featuressuperimposed to its thermal spectrum. Interestingly enough, a faintoptical/infrared source was proposed as a possible counterpart to 1E1207.4-5209, but later questioned, based on coarse positional coincidence.Considering the large offset of 1E 1207.4-5209 with respect to the center ofits host supernova remnant, the source should move at ~70 mas/yr. Thus, wetested the association by measuring the proper motion of the proposed opticalcounterpart. Using HST observations spanning 3.75 years, we computed a 3 sigmaupper limit of 7 mas/yr. Absolute astrometry on the same HST data set alsoplaces the optical source significantly off the 99% confidence Chandraposition. This allows us to safely rule out the association. Using the HST dataset, coupled to ground-based observations collected at the ESO/VLT, we set thedeepest limits ever obtained to the optical/infrared emission from 1E1207.4-5209. By combining such limits to the constraints derived from X-raytiming, we rule out accretion as the source of the thermal anisotropy of theneutron star.

HST and VLT observations of the neutron star 1E 1207.4-5209