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arXiv · 1507.07710

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

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$σ$ level. We also discuss the possible origins of the H$α$ 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.

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O. McConnell, P. J. Callanan, M. Kennedy, D. Hurley, P. Garnavich, J. Menzies. 2015-07-28. Roche Lobe Underfilling of the Secondary Star in PSR J102347.6+003841?. https://doi.org/10.1093/mnras%2Fstv1197

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