A Search for Photometric Variability in L and T-type Brown Dwarf Atmospheres.

Details A Search for Photometric Variability in L and T-type Brown Dwarf Atmospheres. A Search for Photometric Variability in L and T-type Brown Dwarf Atmospheres.

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743415k&link_type=abstract

American Astronomical Society, AAS Meeting #217, #434.15; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

The atmospheres of low-temperature L- and T-type brown dwarfs are cool enough to form clouds of condensates, whose structure has been indirectly studied through rotationally-induced temporal variability. Measurements of the amplitude, timescale and evolution of such variability is necessary to improve upon current one-dimensional atmospheric models, which do not address surface cloud distributions. While a handful of clearly variable late-type dwarfs have been identified in recent years, current sample sizes remain small. Here we present preliminary results from a near-infrared (J and K’ band) monitoring program, examining the variability of 8 L and T-type brown dwarfs. Observations were made using the dual-channel Gemini camera at the Lick Observatory 3m telescope. Results from light curves show that two of the targets show signs of variability over integration periods greater than 1.5 hours. Relative photometry of targets with observations at smaller time integrations (0.5-1.0 hours) does not indicate significant fluctuations or variability. Among our sample, 0805+4812, 1416+1348, 1711+2232, 1511+0607, and 0939-2448 were spectral binary candidates, none of which show evidence of eclipse. We discuss the implications of these results and propose methods to improve brown dwarf monitoring samples.

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