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Astrophysics > High Energy Astrophysical Phenomena

arXiv:1507.07710 (astro-ph)
[Submitted on 28 Jul 2015]

Title:Roche Lobe Underfilling of the Secondary Star in PSR J102347.6+003841?

Authors:O. McConnell, P. J. Callanan, M. Kennedy, D. Hurley, P. Garnavich, J. Menzies
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Abstract:PSR J102347.6+003841 is a radio pulsar system with a spin period of 1.69 ms and an orbital period of 4.75 hours. Uniquely, it undergoes periods of transient accretion from its companion star: it occupies an important position in the evolutionary track from X-ray binary to isolated millisecond radio pulsar. Here we present a spectroscopic study of this system showing late-type absorption features which match those of a G2V star. We find a semiamplitude of $286 \pm 3$ kms$^{-1}$ and a best fit orbital period of 0.1980966(1) days. We combine these measurements with optical photometry which suggests the secondary star may be underfilling its Roche lobe by between 15\% and 20\%. We weakly constrain the mass of the neutron star to be $\leq$ 2.2 M$_\odot$ at the 2$\sigma$ level. We also discuss the possible origins of the H$\alpha$ emission line in our template subtracted, averaged spectrum. Finally we present and discuss new optical photometry of J1023 taken during the recent outburst of the system.
Comments: 6 pages, 6 figures
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE)
Cite as: arXiv:1507.07710 [astro-ph.HE]
  (or arXiv:1507.07710v1 [astro-ph.HE] for this version)
  https://doi.org/10.48550/arXiv.1507.07710
Journal reference: Monthly Notices of the Royal Astronomical Society 2015 451 (4): 3468-3472
Related DOI: https://doi.org/10.1093/mnras/stv1197

Submission history

From: Owen McConnell [view email]
[v1] Tue, 28 Jul 2015 10:14:37 UTC (100 KB)
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