Molecular Hydrogen and Lyman-alpha Emission in FUV Spectra of CTTSs

Details Molecular Hydrogen and Lyman-alpha Emission in FUV Spectra of CTTSs Molecular Hydrogen and Lyman-alpha Emission in FUV Spectra of CTTSs

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20515604h&link_type=abstract

American Astronomical Society Meeting 205, #156.04; Bulletin of the American Astronomical Society, Vol. 36, p.1608

Astronomy and Astrophysics

Astronomy

3

Scientific paper

The presence and structure of gas in circumstellar disks around young stars has profound implications on the formation and early evolution of planets. We use HST/STIS and FUSE spectra of a small sample of CTTSs to study fluorescent H2 emission, pumped by Lyman-alpha. We find that the H2 traces 2500 K gas at or near the disk surface within 2 AU of the central star. These H2 lines allow us to indirectly measure Lyman-alpha emission, which is typically obscured by H I absorption in our line of sight to the star. Lyman-alpha emission contributes 80-90% of the total FUV emission from CTTSs, and alters the disk chemistry.

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