An extensive search for rapid optical variability in ultracool dwarfs

dc.contributor.authorKoen, Chris
dc.date.accessioned2013-11-14T13:25:33Z
dc.date.available2013-11-14T13:25:33Z
dc.date.issued2013
dc.description.abstractIn this paper, a summary of optical time-series photometry of 125 ultracool dwarfs is given. The observing strategy was to monitor each object continuously for 2–3 h in order to ascertain whether itwas rapidly variable. Many of the targetswere observed atmultiple epochs, to follow up possible short time-scale variability, or to test for slow brightness changes on longer timescales. The 353 data sets obtained contain nearly 22 000 individual measurements. Optical (IC) magnitudes, accurate to roughly 0.1–0.2 mag, were derived for 21 objects for which there is no optical photometry in the literature. It is shown that photometry is affected by variable seeing in a large percentage of the time-series observations. Since this could give the appearance of variability intrinsic to the objects, magnitudes are modelled as functions of both time and seeing. Several ultracool dwarfs which had not been monitored before are variable, according to certain model-fitting criteria. A number of objects with multi-epoch observations appear to be variable on longer time-scales. Since testing for variability is far from being straightforward, the time-series data are made available so that interested readers can perform their own analyses.en_US
dc.description.accreditationWeb of Scienceen_US
dc.identifier.citationKoen, C. (2013). An extensive search for rapid optical variability in ultracool dwarfs. Monthly Notices of the Royal Astronomical Society. 428: 2824–2839en_US
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/10566/818
dc.language.isoenen_US
dc.privacy.showsubmitterfalse
dc.publisherOxford University Pressen_US
dc.rights© 2013 Oxford University Press. This file may be freely used for educational purposes, as long as it is not altered in any way. Acknowledgement of the authors and the source is required.
dc.source.urihttp://dx.doi.org/10.1093/mnras/sts208
dc.status.ispeerreviewedtrue
dc.subjectTechniques: photometricen_US
dc.subjectBrown dwarfen_US
dc.subjectStars: low-massen_US
dc.titleAn extensive search for rapid optical variability in ultracool dwarfsen_US
dc.typeArticleen_US

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