a Deep Look at the Nearest Brown Dwarf: Epsilon INDI B, a T2.5 Dwarf

Details a Deep Look at the Nearest Brown Dwarf: Epsilon INDI B, a T2.5 Dwarf a Deep Look at the Nearest Brown Dwarf: Epsilon INDI B, a T2.5 Dwarf

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cxo..prop.1383a&link_type=abstract

Chandra Proposal ID #05200159

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Chandra Proposal Id #05200159

Scientific paper

We propose a deep, exploratory observation of a T brown dwarf in the X-rays. Epsilon Indi B (T2.5) lies at 3.6 pc and is thus the nearest brown dwarf. X-ray detections of brown dwarfs have yet been limited to spectral type M. The cool, dense neutral photospheres of L and T dwarfs should hamper magnetic activity. However, strong peristent and flaring Halpha emission has been detected down to spectral type T. Despite claims that some other mechanisms (e.g., accretion, binary interaction) may be reponsible, the status of magnetic activity in L and T brown dwarfs is far from clear. Our 70ks observation of this "old" brown dwarf will reach Lx=8.5e23 erg/s, equivalent to a ratio log (Lx/Lbol)=-5. The Chandra data will provide strong insights into magnetic activity in late brown dwarfs.

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