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Mass measurements for two binary pulsars discovered in the PALFA survey

Zhu, W. W., Freire, P. C. C., Knispel, B., Allen, B., Stappers, B. W., Lyne, A. G., et al. (2019). Mass measurements for two binary pulsars discovered in the PALFA survey. The Astrophysical Journal, 881(2): 165. doi:10.3847/1538-4357/ab2bef.

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Creators:
Zhu, W. W., Author
Freire, P. C. C., Author
Knispel, B.1, Author
Allen, B.1, Author
Stappers, B. W., Author
Lyne, A. G., Author
Chatterjee, S., Author
Cordes, J. M., Author
Crawford, F., Author
Deneva, J. S., Author
Ferdman, R. D., Author
Hessels, J. W. T., Author
Kaspi, V. M., Author
Lazarus, P., Author
Lynch, R., Author
Ransom, S. M., Author
Stovall, K., Author
Donner, J. Y., Author
Affiliations:
1Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24011

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Free keywords: Astrophysics, Solar and Stellar Astrophysics, astro-ph.SR, Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
Abstract: In this paper, we present the results of timing observations of PSRs J1949+3106 and J1950+2414, two binary millisecond pulsars discovered in data from the Arecibo ALFA pulsar survey (PALFA). The timing parameters include precise measurements of the proper motions of both pulsars, which show that PSR J1949+3106 has a transversal motion very similar to that of an object in the local standard of rest. The timing also includes measurements of the Shapiro delay and the rate of advance of periastron for both systems. Assuming general relativity, these allow estimates of the masses of the components of the two systems; for PSR J1949+3106, the pulsar mass is $M_p \, = \, 1.34^{+0.17}_{-0.15} \, M_{\odot}$ and the companion mass $M_c \, = \, 0.81^{+0.06}_{-0.05}\, M_{\odot}$; for PSR J1950+2414 $M_p \, = \, 1.496 \, \pm \, 0.023\, M_{\odot}$ and $M_c \, = \, 0.280^{+0.005}_{-0.004}\, M_{\odot}$ (all values 68.3 % confidence limits). We use these masses and proper motions to investigate the evolutionary history of both systems: PSR J1949+3106 is likely the product of a low-kick supernova; PSR J1950+2414 is a member of a new class of eccentric millisecond pulsar binaries with an unknown formation mechanism. We discuss the proposed hypotheses for the formations of these systems in light of our new mass measurements.

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Dates: 2019-07-112019
Publication Status: Published in print
Pages: 12 pages, 5 figures, accepted for publication in the Astrophysical Journal
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Title: The Astrophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 881 (2) Sequence Number: 165 Start / End Page: - Identifier: -