Searching for Weather in Brown Dwarfs

Abstract

We have used an innovative tuneable filter technique to carry out a search for the variability signatures of meterological processes in the atmospheres of two nearby brown dwarfs. We find no evidence for variability in the L-type brown dwarf DENIS-PJ1228-1547 in an observations spanning approximately half a rotation period (3 hours), and evidence for variability in the M-type brown dwarf LP 944-20 in multiple observations spanning approximately one third of a rotation period (1.5 hours).

8 pages, 7 figures. To appear in the Monthly Notices of the RAS. Replaced version contains paper as accepted

References in corpus (6)

• The Spectrum of the Brown Dwarf Gliese 229B
• High-resolution Spectra of Very Low-Mass Stars
• The Intermediate Age Brown Dwarf LP 944-20
• DENIS-P J1228.2-1547 -- A New Benchmark Brown Dwarf
• TTF: a flexible approach to narrowband imaging
• A Technique for Narrowband Time Series Photometry: the X-ray Star V2116 Oph

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