Constraints on the Formation of PSR J0737-3039: the most probable isotropic kick magnitude
Abstract
A strongly relativistic binary pulsar has been recently discovered with the 64m Parkes telescope (Burgay et al. 2003). Here we use the measured properties of this binary (masses and orbital characteristics as well as age estimates), and we derive the complete set of constraints imposed on the physical properties of the binary pulsar progenitor right before the second supernova explosion. In contrast to Dewi & van den Heuvel (2003), we find that: (i) Roche-lobe overflow from the helium-rich progenitor of the second neutron star is likely, but not strictly necessary; (ii) the neutron-star kick magnitude is constrained in the wider range 60-1560 km/s, with the most probable value being equal to 150 km/s. The reason for this difference is that Dewi & van den Heuvel (2003) have inadvertently but effectively restricted the kick to lie in the pre-supernova orbital plane. We derive similar constraints for the other two relativistic double neutron stars known in the Galactic disk.Keywords
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