A Deep Look at the T-Type Brown Dwarf Binary epsilon Indi Bab with Chandra and ATCA

A Deep Look at the T-Type Brown Dwarf Binary $\epsilon$ Indi Bab with
Chandra and ATCA

Authors:
M. Audard (1),
A. Brown (2),
K.R. Briggs (3),
M. Guedel (3),
A. Telleschi (3),
J.E. Gizis (4) ((1) Columbia Astrophysics Laboratory, (2) CASA/University of Colorado, (3) Paul Scherrer Institut, (4) University of Delaware)

Comments: Accepted for publication in the Astrophysical Journal Letters

We present deep observations of the nearby T-type brown dwarf binary
$\epsilon$ Indi Bab in radio with the Australia Telescope Compact Array and in
X-rays with the Chandra X-ray Observatory. Despite long integration times, the
binary (composed of T1 and T6 dwarfs) was not detected in either wavelength
regime. We reached $3\sigma$ upper limits of $1.23 \times 10^{12}$ and $1.74
\times 10^{12}$ erg/s/Hz for the radio luminosity at 4.8 GHz and 8.64 GHz,
respectively; in the X-rays, the upper limit in the $0.1-10$ keV band was $3.16
\times 10^{23}$ erg/s. We discuss the above results in the framework of
magnetic activity in ultracool, low-mass dwarfs.

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