X-ray Detections of Two Young Bona-Fide Brown Dwarfs

Details X-ray Detections of Two Young Bona-Fide Brown Dwarfs X-ray Detections of Two Young Bona-Fide Brown Dwarfs

2004-05-05

arxiv.org/abs/astro-ph/0405077v1

Astron.Astrophys. 424 (2004) 619-625

Astronomy and Astrophysics

Astrophysics

9 pages, 3 figures, accepted for A&A

Scientific paper

10.1051/0004-6361:20040016

I report here the detection of two bona-fide brown dwarfs by XMM-Newton: [GY92] 141 in the rho-Ophiuchus star forming region and DENIS-P J155601-233809 in the Upper Scorpius OB association. The two objects have been detected with luminosities of Lx=8.35\pm2.86*10^28 erg/s and Lx=6.54\pm1.35*10^28 erg/s respectively, corresponding to luminosity ratios of log(Lx/Lbol)= -2.07 and log(Lx/Lbol)= -2.69. The two sources were close to the limit of detection of the instruments at only 2~3-sigma above the background level, and no significant flare or variation could be detected during the 48.3ks and 33.9ks observations. [GY92] 141 had already been observed 10 months earlier with Chandra (see 2001 ApJ, 563, 361) with a luminosity ~14 times fainter than the one I report here, meaning that the X-ray emission of this object is strongly variable.

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