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Chandra Science Highlights

Chandra Science Highlights. X-RAY IMAGE OF FLARE FROM BROWN DWARF LP944-20.

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Chandra Science Highlights

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  1. Chandra Science Highlights X-RAY IMAGE OF FLARE FROM BROWN DWARF LP944-20 For the first 9 hr 36 min of Chandra’s observation, no x-rays were detected from the brown dwarf LP944-20. (left panel). Then the brown dwarf turned on with a bright x-ray flare (right panel) that gradually diminished over the last few hours of the observation. The grainy appearance of the image on the right is due to a shorter exposure time. The bright dots in the background are other x-ray sources, 7 of which have been identified as stars. • First flare detected at any wavelength from a brown dwarf star. • Duration of Flare: 1-2 hours • Energy emitted in flare and peak x-ray luminosity: E=2x10 ergs; L=1.2x10 erg/sec. • Limit on quiescent x-ray emission: L<1x10 erg/sec. • Facts about LP944-20: Mass ~0.06 solar masses; T ~2500 K, Radius ~0.1 solar radii, Rotation period <5 hours, Distance ~5pc. Credit: NASA/UCB/Caltech/R.Rutledge et al. Ref.: R. Rutledge et al. Ap.J.Letters (20 July 00, in press) Scale: The image is 3.5 arcmin square (1 armin corresponds to 30 kpc).. 29 26 24 surf July 2000

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