XMM-Newton Observation of the Double Neutron Star Binary J1537+1155

The properties of neutron star magnetospheres and relativistic winds down tolight cylinder scale can be constrained with unprecedented precision bymultiwavelength observations of suitable double neutron star binaries (DNSBs).PSR J1537+1155 and PSR J0737 3039 are the only firmly identified DNSBs detectedwith the current generation of Xray telescopes. Because of its higher orbitaleccentricity, J1537+1155 offers a unique opportunity for the identification andstudy of NSs interaction signatures, such as flux orbital modulation. Thepresence of detectable Xray emission from this system is guaranteed by Chandraobservations, but the crucial claims about orbital variability can be confirmedand better investigated only by XMMNewton. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]