Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Shapiro delay in PSR~J1811$-$2405   This paper presents the first detection of Shapiro delay from the binary
millisecond pulsar PSR J1811-2405. We report a 11-${\sigma}$ measurement of the
orthometric amplitude, h$_3$=6.8(6)x10$^{-7}$, and a 16-${\sigma}$ measurement
of the orthometric ratio, ${\varsigma}$= 0.81(5). Given the relatively high
orbital inclination, i= 79(2) deg, of this binary system, we obtain constraints
on the companion mass of m$_c$= 0.31$\substack{+0.08 \\ -0.06}M_\odot$. The
pulsar mass is currently less well constrained, with a value of
2.0$\substack{+0.8 \\ -0.5}M_\odot$. The companion mass and the orbital period
are in agreement with the prediction made by previous numerical calculations of
the evolution of compact binary systems. From a study of the polarization, we
find that the orbital inclination angle is ~100 deg and that PSR J1811-2405 is
an orthogonal rotator. In addition, the ${\mu}$s-level timing precision
together with its narrow profile make PSR J1811-2405 a good candidate for
inclusion in the pulsar timing arrays being used to detect nHz Gravitational
waves.

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The categories of this paper are: econ
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The categories of this paper are: stat
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The categories of this paper are: cond-mat
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The categories of this paper are: atom-ph
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The categories of this paper are: solv-int
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The categories of this paper are: math
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The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
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The categories of this paper are: cmp-lg
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci