Quiescent X-ray emission from an evolved brown dwarf ?

Details Quiescent X-ray emission from an evolved brown dwarf ? Quiescent X-ray emission from an evolved brown dwarf ?

2004-09-27

arxiv.org/abs/astro-ph/0409617v1

Astrophys.J. 615 (2004) L153-L156

Astronomy and Astrophysics

Astrophysics

to appear in ApJL

Scientific paper

10.1086/426121

I report on the X-ray detection of Gl569Bab. During a 25ksec Chandra observation the binary brown dwarf is for the first time spatially separated in X-rays from the flare star primary Gl569A. Companionship to Gl569A constrains the age of the brown dwarf pair to ~300-800 Myr. The observation presented here is only the second X-ray detection of an evolved brown dwarf. About half of the observing time is dominated by a large flare on Gl569Bab, the remainder is characterized by weak and non-variable emission just above the detection limit. This emission -- if not related to the afterglow of the flare -- represents the first detection of a quiescent corona on a brown dwarf, representing an important piece in the puzzle of dynamos in the sub-stellar regime.

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