Observations of ultracool dwarfs with ULTRACAM on the VLT: a search for weather
Littlefair, S. P., Dhillon, V. S., Marsh, T. R., Shahbaz, T. and Martin, E. L.. (2006) Observations of ultracool dwarfs with ULTRACAM on the VLT: a search for weather. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 370 (3). pp. 1208-1212. ISSN 0035-8711Full text not available from this repository.
Official URL: http://dx.doi.org/10.1111/j.1365-2966.2006.10523.x
We present multicolour photometry of four-field ultracool dwarfs with the triple-beam photometer ULTRACAM. Data were obtained simultaneously in the Sloan-g' band and a specially designed narrow-band Na I filter. The previously reported 1.8-h period of Kelu-1 is here recovered in the g' band, but the lack of any significant variability in the Na I light of this object precludes any conclusion as to the cause of the variability. 2MASS 2057-0252 and DENIS 1441-0945 show no convincing evidence for variability. 2MASS 1300+1912, on the other hand, shows good evidence for gradual trends in both bands at the 5 per cent level. These trends are anticorrelated at a high level of significance, a result, which is incompatible with models of star-spot induced variability. It would seem likely that dust-cloud 'weather' is responsible for the short-term variability in this object.
|Item Type:||Journal Article|
|Subjects:||Q Science > QB Astronomy|
|Journal or Publication Title:||MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY|
|Date:||11 August 2006|
|Number of Pages:||5|
|Page Range:||pp. 1208-1212|
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