A search for short time-scale JHK variability in ultracool dwarfs

Details A search for short time-scale JHK variability in ultracool dwarfs A search for short time-scale JHK variability in ultracool dwarfs

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mnras.354..466k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 354, Issue 2, pp. 466-476.

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15

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

Scientific paper

The results of continuous monitoring, with typical durations of 2-4 h, of 18 L and T dwarfs are presented. Measurements were made simultaneously in JHKS, with a typical time resolution of about 10 min. Limits on the variability are well below 0.02 mag in all cases except for the faintest object. There are none the less a few dwarfs in which we may have observed variability: the same patterns of very low-level activity seemed to be present in the data for more than one filter. Simultaneous frequency-domain analysis of the J, H and KS data furthermore hints at a very short period (0.8-1.6 h) in a few objects. We also present a brief assessment of some of the variability test statistics that have been used in the field of ultracool dwarf variability.

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