Observational Evidence of Optical Variability in L Dwarfs

Details Observational Evidence of Optical Variability in L Dwarfs Observational Evidence of Optical Variability in L Dwarfs

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aj....133.1633m&link_type=abstract

The Astronomical Journal, Volume 133, Issue 4, pp. 1633-1644 (2007).

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4

Stars: Low-Mass, Brown Dwarfs, Stars: Rotation, Stars: Variables: Other

Scientific paper

The results of quasi-simultaneous continuous monitoring of six L dwarfs in the R and I bands are presented. A careful analysis of the data shows that the object 2MASSW J0036+1821 is variable in the I and R bands. The amplitudes of our variable object were found to be 0.010 in the I band and 0.030 in the R band. Interestingly, while 2MASSW J0036+1821 was variable in the I band, it remained nonvariable in the R band, and vice versa. As most of the previous variability search programs of L dwarfs were carried out in the I band, this is the first evidence of this type of strange phenomena. The time evolution and rapid formation of dust on a macroscopic scale can plausibly produce this type of nonperiodic random variability.

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