Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A reevaluation of the proposed spin-down of the white dwarf pulsar in AR
  Scorpii   We present high-speed optical photometric observations, spanning ~2 years, of
the recently-discovered white dwarf pulsar AR Scorpii. The amplitudes of the
orbital, spin and beat modulations appear to be remarkably stable and
repeatable over the time span of our observations. It has been suggested that
the polarized and non-polarized emission from AR Scorpii is powered by the
spin-down of the white dwarf. However, we find that our new data is
inconsistent with the published spin-down ephemeris. Whilst our data is
consistent with a constant spin period further observations over an extended
time-base are required in order to ascertain the true spin-evolution of the
white dwarf.

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The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
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The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
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The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: eess
0
The categories of this paper are: hep-ph
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The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ