Formation of the Double Neutron Star System PSR J1930-1852
Abstract
The spin period (185 ms) and period derivative (1.8× {10}-17 {{s}} {{{s}}}-1) of the recently discovered double neutron star (DNS) system PSR J1930-1852 indicate that the pulsar was mildly recycled through the process of Roche-lobe overflow. This system has the longest orbital period (45 days) of the known DNS systems, and can be formed from a helium star-NS binary if the initial mass of the helium star was ≲ 4.0{M}⊙ ; otherwise, the helium star would never fill its Roche-lobe. At the moment of the supernova explosion, the mass of the helium star was ≲ 3.0{M}⊙ . We find that the probability distribution of the velocity kick imparted to the new-born neutron star has a maximum at about 30 {km} {{{s}}}-1 (and a tail up to 260 {km} {{{s}}}-1), indicating that this NS probably received a low kick velocity at birth.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- January 2016
- DOI:
- 10.3847/0004-637X/816/1/45
- arXiv:
- arXiv:1512.02785
- Bibcode:
- 2016ApJ...816...45S
- Keywords:
-
- binaries: general;
- pulsars: individual: J1930–1852;
- stars: evolution;
- stars: neutron;
- Astrophysics - High Energy Astrophysical Phenomena;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 9 pages, 4 figures, accepted for publication in ApJ