Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-11-18
Astrophys.J. 599 (2003) L99-L102
Astronomy and Astrophysics
Astrophysics
12 pages, 4 figures. Accepted for publication in ApJL
Scientific paper
10.1086/381260
We report the discovery of PSR J1909-3744, a 2.95 millisecond pulsar in a nearly circular 1.53 day orbit. Its narrow pulse width of 43 microseconds allows pulse arrival times to be determined with great accuracy. We have spectroscopically identified the companion as a moderately hot (T = 8500 K) white dwarf with strong absorption lines. Radial velocity measurements of the companion will yield the mass ratio of the system. Our timing data suggest the presence of Shapiro delay; we expect that further timing observations, combined with the mass ratio, will allow the first accurate determination of a millisecond pulsar mass. We have measured the timing parallax and proper motion for this pulsar which indicate a transverse velocity of 140 (+80/-40) km/s. This pulsar's stunningly narrow pulse profile makes it an excellent candidate for precision timing experiments that attempt to detect low frequency gravitational waves from coalescing supermassive black hole binaries.
Anderson Seth B.
Bailes Matthew
Hotan Aidan
Jacoby Barry A.
Kulkarni Sanjeev R.
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