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- W2107572165 abstract "We report on the first detection of X-ray emission from a brown dwarf in the Pleiades, the M7-type Roque 14, obtained using the EPIC detectors on XMM–Newton. This is the first X-ray detection of a brown dwarf intermediate in age between ≈12 and ≈320 Myr. The emission appears persistent, although we cannot rule out flare-like behaviour with a decay time-scale >4 ks. The time-averaged X-ray luminosity of LX≈ 3.3 ± 0.8 × 1027 erg s−1 and its ratios with the bolometric (LX/Lbol≈ 10−3.05) and Hα (LX/LHα≈ 4.0) luminosities suggest magnetic activity similar to that of active main-sequence M dwarfs, such as the M7 old-disc star VB 8, although the suspected binary nature of Roque 14 merits further attention. No emission is detected from four proposed later-type Pleiades brown dwarfs, with upper limits to LX in the range 2.1–3.8 × 1027 erg s−1 and to log (LX/Lbol) in the range −3.10 to −2.91." @default.
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- W2107572165 date "2004-09-01" @default.
- W2107572165 modified "2023-09-25" @default.
- W2107572165 title "X-ray emission from a brown dwarf in the Pleiades" @default.
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- W2107572165 doi "https://doi.org/10.1111/j.1365-2966.2004.08100.x" @default.
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