Two Millisecond Pulsars Discovered by the PALFA Survey and a Shapiro Delay Measurement

Abstract : We present two millisecond pulsar discoveries from the PALFA survey of the Galactic plane with the Arecibo telescope. PSR J1955+2527 is an isolated pulsar with a period of 4.87 ms, and PSR J1949+3106 has a period of 13.14 ms and is in a 1.9 day binary system with a massive companion. Their timing solutions, based on 4 years of timing measurements with the Arecibo, Green Bank, Nançay , and Jodrell Bank telescopes, allow precise determination of spin and astrometric parameters, including precise determinations of their proper motions. For PSR J1949+3106, we can clearly detect the Shapiro delay. From this we measure the pulsar mass to be 1.47 +0.43 −0.31 M , the companion mass to be 0.85 +0.14 −0.11 M , and the orbital inclination to be i = 79.9 −1.9 +1.6 deg, where uncertainties correspond to ±1σ confidence levels. With continued timing, we expect to also be able to detect the advance of periastron for the J1949+3106 system. This effect, combined with the Shapiro delay, will eventually provide very precise mass measurements for this system and a test of general relativity.
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J. S. Deneva, P. C. C. Freire, J. M. Cordes, A. G. Lyne, S. M. Ransom, et al.. Two Millisecond Pulsars Discovered by the PALFA Survey and a Shapiro Delay Measurement. The Astrophysical Journal, American Astronomical Society, 2012, 757 (1), 10 p. ⟨10.1088/0004-637X/757/1/89⟩. ⟨insu-01259503⟩

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