X-ray emission from a brown dwarf in the Pleiades

Details X-ray emission from a brown dwarf in the Pleiades X-ray emission from a brown dwarf in the Pleiades

2004-06-04

arxiv.org/abs/astro-ph/0406112v2

Astronomy and Astrophysics

Astrophysics

8 pages, 4 figures (6 eps files), accepted for publication in MNRAS, Na I "emission" corrected to "absorption" in description

Scientific paper

10.1111/j.1365-2966.2004.08100.x

We report 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) x 10^{27} erg/s, and its ratios with the bolometric (Lx/Lbol = 10^{-3.05}) and Halpha (Lx/LHa = 4.0) luminosities suggest magnetic activity similar to that of active main-sequence M dwarfs, such as the M7 old-disc star VB 8, though 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 x 10^{27} erg/s and to log(Lx/Lbol) in the range -3.10 to -2.91.

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