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

J. S. Deneva 1 P. C. C. Freire 2 J. M. Cordes 3 A. G. Lyne 4 S. M. Ransom 5 Ismaël Cognard 6, 7 F. Camilo 1, 8 D. J. Nice 9 I. H. Stairs 10 B. Allen 11 N. D. R. Bhat 12 S. Bogdanov 8 A. Brazier 3 D. J. Champion 2 S. Chatterjee 3 F. Crawford 13 G. Desvignes 2 J. W. T. Hessels 14 F. A. Jenet 15 V. M. Kaspi 16 B. Knispel 11 M. Kramer 2 P. Lazarus 2 J. van Leeuwen 14 D. R. Lorimer 17 R. S. Lynch 16 M. A. Mclaughlin 17 P. Scholz 16 X. Siemens 18 B. W. Stappers 4 K. Stovall 15 A. Venkataraman 1 
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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