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• W3122423374 startingPage "2071" @default.
• W3122423374 abstract "We present Spitzer observations at [3.6] and [4.5] microns together with the methane short (1.58,mic)-methane long (1.69,mic) colour for 3 cool dwarfs in the Pleiades, PLZJ23, PLZJ93 and PLZJ100. We determine the effective temperatures of PLZJ23 and PLZJ93 to be ~1200 and ~1100 K. From the broadband photometry we place an upper limit of 1100 K on the effective temperature of PLZJ100 but lack the data required to determine the value more precisely. These temperatures are in the T dwarf regime yet the methane colours indicate no methane is present.We attribute this to youth/low gravity in line with theoretical expectations. However, we find even less methane is present than predicted by the models. PLZJ23 and PLZJ93 are also very bright in the [3.6] micron waveband (PLZJ100 is not measured) compared to field brown dwarfs which can also be explained by this lack of methane. The definition of the T spectral class is the appearance of methane absorption, so strictly, via this definition, PLZJ93 and PLZJ100 cannot be described as T dwarfs. The colours of these two objects are, however, not compatible with those of L dwarfs. Thus we have a classification problem and cannot assign these objects a (photometric) spectral type." @default.
• W3122423374 created "2021-02-01" @default.
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• W3122423374 date "2011-01-19" @default.
• W3122423374 modified "2023-10-06" @default.
• W3122423374 title "Methane band and Spitzer mid-IR imaging of L and T dwarf candidates in the Pleiades" @default.
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• W3122423374 doi "https://doi.org/10.1111/j.1365-2966.2010.18044.x" @default.
• W3122423374 hasPublicationYear "2011" @default.
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