Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Roche Lobe Underfilling of the Secondary Star in PSR J102347.6+003841?   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.

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The categories of this paper are: math
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The categories of this paper are: nlin
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The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ex
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-th
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The categories of this paper are: cs