Journal
ASTROPHYSICAL JOURNAL
Volume 844, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/aa7bee
Keywords
binaries: close; gravitational waves; pulsars: general; pulsars: individual (J2222-0137); stars:neutron; white dwarfs
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Funding
- Programme National de Cosmologie and Galaxies (PNCG) of CNRS/INSU, France
- European Research Council [279702, 610058]
- Science and Technology Facilities Council [ST/P000649/1] Funding Source: researchfish
- STFC [ST/P000649/1] Funding Source: UKRI
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We report on the results of a 4 year timing campaign of PSR. J2222-0137, a 2.44 day binary pulsar with a massive white dwarf (WD) companion, with the Nancay, Effelsberg, and Lovell radio telescopes. Using the Shapiro delay for this system, we find a pulsar mass m(p) = 1.76. +/- 0.06 M circle dot and a WD mass m(c) = 1.293. +/- 0.025 M circle dot. We also measure the rate of advance of periastron for this system, which is marginally consistent with the general relativity prediction for these masses. The short lifetime of the massive WD progenitor star led to a rapid X-ray binary phase with little (< 10(-2) M circle dot) mass accretion onto the neutron star; hence, the current pulsar mass is, within uncertainties, its birth mass, which is the largest measured to date. We discuss the discrepancy with previous mass measurements for this system; we conclude that the measurements presented here are likely to be more accurate. Finally, we highlight the usefulness of this system for testing alternative theories of gravity by tightly constraining the presence of dipolar radiation. This is of particular importance for certain aspects of strong-field gravity, like spontaneous scalarization, since the mass of PSR. J2222-0137 puts that system into a poorly tested parameter range.
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