A search for H2 around pre-main-sequence stars

Abstract

We present the results of a search for pure rotational molecular hydrogen emission from two pre-main-sequence stars, AB Aur and CQ Tau. Observations were made using MICHELLE, the mid-IR echelle spectrometer at the UK Infrared Telescope. We found some evidence for emission in the J = 4 --> 2 line in AB Aur, but no J = 3 --> 1 line from either star. We derive upper limits on line flux which are significantly smaller than previous line flux estimates based on ISO observations. This suggests that the emission detected by ISO is extended on scales of at least 6 arcsec, and does not come from the disk as previously thought.

5 pages, accepted for publication in MNRAS

References in corpus (4)

• H2 and CO emission from disks around TTauri and HerbigAe pre-main-sequence stars and from debris disks around young stars: warm and cold circumstellar gas
• FUSE and HST STIS Observations of Hot and Cold Gas in the AB Aurigae System
• Looking for Pure Rotational H_2 Emission from Protoplanetary Disks
• Detection of Molecular Hydrogen Orbiting a "Naked" T Tauri Star

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