First Ultraviolet Spectrum of a Brown Dwarf: Evidence for H_2 Fluorescence and Accretion

Details First Ultraviolet Spectrum of a Brown Dwarf: Evidence for H_2 Fluorescence and Accretion First Ultraviolet Spectrum of a Brown Dwarf: Evidence for H_2 Fluorescence and Accretion

2005-07-19

arxiv.org/abs/astro-ph/0507429v1

Astrophys.J.630:L89-L92,2005

Astronomy and Astrophysics

Astrophysics

8 pages, to appear in Astrophysical Journal Letters

Scientific paper

10.1086/462414

We analyze an HST/STIS ultraviolet spectrum of the young brown dwarf 2MASSW J1207334-393254, a member of the ten million-year old TW Hya Association that has a planetary-mass companion. We detect and identify numerous emission lines. CIV and other ions are seen that arise in hot gas. We identify a series of lines with Lyman-pumped H_2 molecular lines, indicating that cool gas is also present. Overall, this substellar object shows many of the same characteristics as classical T Tauri stars. We interpret our results as direct evidence of accretion from a circumstellar gas disk, consistent with previous claims. The lack of SiIV emission from the accreting gas indicates that silicon has been depleted into grains.

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