6533b852fe1ef96bd12aacca
RESEARCH PRODUCT
Quiescent X-ray emission from an evolved brown dwarf ?
Beate StelzerBeate Stelzersubject
PhysicsAstrophysics::High Energy Astrophysical PhenomenaAstrophysics (astro-ph)Flare starBrown dwarfFOS: Physical sciencesAstronomy and AstrophysicsAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsAfterglowlaw.inventionCorona (optical phenomenon)Space and Planetary SciencePrimary (astronomy)lawAstrophysics::Solar and Stellar AstrophysicsAstrophysics::Earth and Planetary AstrophysicsAstrophysics::Galaxy AstrophysicsFlaredescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2004-09-27 |