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We present the first optical observations of the unique system J0737-3039(composed of two pulsars, hereafter PSR-A and PSR-B). Ultra-deep opticalobservations, performed with the High Resolution Camera of the Advanced Camerafor Surveys on board the Hubble Space Telescope could not detect any opticalemission from the system down to m_F435W=27.0 and m_F606W=28.3. The estimatedoptical flux limits are used to constrain the three-component (two thermal andone non-thermal) model recently proposed to reproduce the XMM-Newton X-rayspectrum. They suggest the presence of a break at low energies in thenon-thermal power law component of PSR-A and are compatible with the expectedblack-body emission from the PSR-B surface. The corresponding efficiency of theoptical emission from PSR-A's magnetosphere would be comparable to that ofother Myr-old pulsars, thus suggesting that this parameter may not dramaticallyevolve over a time-scale of a few Myr.

Constraining the optical emission from the double pulsar system J0737-3039