Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-10-07
Astrophys.J.692:723-728,2009
Astronomy and Astrophysics
Astrophysics
17 pages, 2 figures, accepted to ApJ
Scientific paper
10.1088/0004-637X/692/1/723
The discovery of the eccentric binary and millisecond pulsar PSR J1903+03273 has raised interesting questions about the formation mechanisms of this peculiar system. Here we present a born-fast scenario for PSR J1903+03273. We assume that during the supernova (SN) explosion that produced the pulsar, a fallback disk was formed around and accreted onto the newborn neutron star. Mass accretion could accelerate the neutron star's spin to milliseconds, and decrease its magnetic field to $\sim 10^8-10^9$ G, provided that there was sufficient mass ($\sim 0.1 M_{\sun}$) in the fallback disk. The neutron star became a millisecond pulsar after mass accretion terminated. In the meanwhile the binary orbit has kept to be eccentric (due to the SN explosion) for $\sim 10^{9}$ yr. We have performed population synthesis calculations of the evolutions of neutron stars with a fallback disk, and found that there might be tens to hundreds of PSR J1903+03273-like systems in the Galaxy. This scenario also suggests that some fraction of isolated millisecond pulsars in the Galactic disk could be formed through the same channel.
Li Xiang-Dong
Liu Xiao-Wei
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