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Photometric monitoring from warm Spitzer reveals that the L3 dwarf DENIS-PJ1058.7-1548 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 the3.6 micron band, confirming the reality of a 4.31 +/- 0.31 hour periodicitydetected in J-band photometry from the SOAR telescope. The J-band variationsare 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 amplituderatio of only 0.23 +/- 0.15, consistent with zero 4.5 micron variability. Thiswide range in amplitudes indicates rotationally modulated variability due tomagnetic phenomena and/or inhomogeneous cloud cover. Weak H-alpha emissionindicates some magnetic activity, but it is difficult to explain the observedamplitudes by magnetic phenomena unless they are combined with cloudinhomogeneities (which might have a magnetic cause). However, inhomogenouscloudcover alone can explain all our observations, and our data align withtheory in requiring that the regions with the thickest clouds also have thelowest effective temperature. Combined with published v sin(i) results, ourrotation period yields a 95% confidence lower limit of 0.111 solar radii on theradius of DENIS-P J1058.7-1548, suggesting upper limits of 320 Myr and 0.055solar masses on the age and mass. These limits should be regarded cautiouslybecause of 3-sigma inconsistencies with other data; however, a lower limit of45 degrees on the inclination is more secure. DENIS-P J1058.7-1548 is only thefirst of nearly two dozen low-amplitude variables discovered and analyzed bythe Weather on Other Worlds project.

Weather on Other Worlds I: Detection of Periodic Variability in the L3 Dwarf DENIS-P J1058.7-1548 with Precise Multi-Wavelength Photometry