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 0035-8711

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Abstract

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
Publisher:	BLACKWELL PUBLISHING
ISSN:	0035-8711
Date:	11 August 2006
Volume:	370
Number:	3
Number of Pages:	5
Page Range:	pp. 1208-1212
Identification Number:	10.1111/j.1365-2966.2006.10523.x
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/33251

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