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- W636054178 abstract "We present the Robert C. Byrd Green Bank Telescope discovery of the highly eccentric binary millisecond pulsar PSR J1835$-$3259A in the Fermi Large Area Telescope-detected globular cluster NGC 6652. Timing over one orbit yields the pulse period 3.89 ms, orbital period 9.25 d, eccentricity $sim 0.95$, and an unusually high companion mass of $0.74,M_{odot}$ assuming a $1.4,M_{odot}$ pulsar. We caution that the lack of data near periastron prevents a precise measurement of the eccentricity, and that further timing is necessary to constrain this and the other orbital parameters. From tidal considerations, we find that the companion must be a compact object. This system likely formed through an exchange encounter in the dense cluster environment. Our initial timing results predict the measurements of at least two post-Keplerian parameters with long-term phase-connected timing: the rate of periastron advance $dot{omega} sim 0.1^{circ},$yr$^{-1}$, requiring 1 yr of phase connection; and the Einstein delay $gamma_{mathrm{GR}} sim 10,$ms, requiring 2-3 yr of timing. For an orbital inclination $i > 50^{circ}$, a measurement of $sin{i}$ is also likely. PSR J1835$-$3259A thus provides an opportunity to measure the neutron star mass with high precision; to probe the cluster environment; and, depending on the nature of the companion, to investigate the limits of general relativity." @default.
- W636054178 created "2016-06-24" @default.
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- W636054178 date "2015-07-07" @default.
- W636054178 modified "2023-09-27" @default.
- W636054178 title "A HIGHLY ECCENTRIC 3.9 MILLISECOND BINARY PULSAR IN THE GLOBULAR CLUSTER NGC 6652" @default.
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- W636054178 doi "https://doi.org/10.1088/2041-8205/807/2/l23" @default.
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