Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Weather on Other Worlds I: Detection of Periodic Variability in the L3
  Dwarf DENIS-P J1058.7-1548 with Precise Multi-Wavelength Photometry   Photometric monitoring from warm Spitzer reveals that the L3 dwarf DENIS-P
J1058.7-1548 varies sinusoidally in brightness with a period of 4.25
+0.26/-0.16 hours and an amplitude of 0.388 +/- 0.043% (peak-to-valley) in the
3.6 micron band, confirming the reality of a 4.31 +/- 0.31 hour periodicity
detected in J-band photometry from the SOAR telescope. The J-band variations
are a factor of 2.17 +/- 0.35 larger in amplitude than those at 3.6 microns,
while 4.5 micron Spitzer observations yield a 4.5 micron/3.6 micron amplitude
ratio of only 0.23 +/- 0.15, consistent with zero 4.5 micron variability. This
wide range in amplitudes indicates rotationally modulated variability due to
magnetic phenomena and/or inhomogeneous cloud cover. Weak H-alpha emission
indicates some magnetic activity, but it is difficult to explain the observed
amplitudes by magnetic phenomena unless they are combined with cloud
inhomogeneities (which might have a magnetic cause). However, inhomogenous
cloudcover alone can explain all our observations, and our data align with
theory in requiring that the regions with the thickest clouds also have the
lowest effective temperature. Combined with published v sin(i) results, our
rotation period yields a 95% confidence lower limit of 0.111 solar radii on the
radius of DENIS-P J1058.7-1548, suggesting upper limits of 320 Myr and 0.055
solar masses on the age and mass. These limits should be regarded cautiously
because of 3-sigma inconsistencies with other data; however, a lower limit of
45 degrees on the inclination is more secure. DENIS-P J1058.7-1548 is only the
first of nearly two dozen low-amplitude variables discovered and analyzed by
the Weather on Other Worlds project.

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The categories of this paper are: chem-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-lat
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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: q-alg
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The categories of this paper are: math
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: mtrl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
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The categories of this paper are: plasm-ph