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X-ray emission from a brown dwarf in the Pleiades | | K. R. Briggs
; J. P. Pye
; | | Date: |
4 Jun 2004 | | Subject: | astro-ph | | Affiliation: | Paul Scherrer Institut, Villigen-PSI, Switzerland; Department of Physics and Astronomy, University of Leicester, Leicester, UK | | Abstract: | 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. | | Source: | arXiv, astro-ph/0406112 | | Services: | Forum | Review | PDF | Favorites | |
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