A Case for Clouds in L dwarfs

Details A Case for Clouds in L dwarfs A Case for Clouds in L dwarfs

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..676g&link_type=abstract

The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August

Astronomy and Astrophysics

Astrophysics

L Dwarfs, Visible Observations

Scientific paper

The effective temperatures of L dwarfs span the range where molecules can condense to form clouds. Non-uniform cloud features can provide a source of photometric variations in much the same way that non-uniform starspot coverage can cause variations in hotter objects. We present results of a small sample from a variability search of 18 L dwarfs. We find that 2MASS 0036+18 and 2MASS 0135+12 are variable, whereas 2MASS 1412+16 is not. The two variable objects exhibit significant periodicity at 2.2 hours (2MASS 0036+18) and 18.7 hours (2MASS 0135+12). Finally, we present observational and theoretical evidence that supports a non-magnetic origin for the variations.

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