Littlefair, S.P. orcid.org/0000-0001-7221-855X, Dhillon, V.S. orcid.org/0000-0003-4236-9642, Marsh, T.R. et al. (2 more authors) (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
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.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2006 The Authors. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | stars: individual: Kelu-1; stars: individual: 2MASS 1300+1912; stars: individual: 2MASS 2057−0252; stars: individual: DENIS 1441−0945; stars: low-mass; brown dwarfs |
Dates: |
|
Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 10 Apr 2019 13:28 |
Last Modified: | 10 Apr 2019 13:28 |
Status: | Published |
Publisher: | Oxford University Press |
Refereed: | Yes |
Identification Number: | 10.1111/j.1365-2966.2006.10523.x |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:144707 |