H2 Mid-IR Pure Rotational Emission from Young Stars: The TEXES/IRTF Survey

Details H2 Mid-IR Pure Rotational Emission from Young Stars: The TEXES/IRTF Survey H2 Mid-IR Pure Rotational Emission from Young Stars: The TEXES/IRTF Survey

2004-03-15

arxiv.org/abs/astro-ph/0403349v1

Astronomy and Astrophysics

Astrophysics

6 pages, to appear in Proceedings of the ESO Workshop on "High Resolution Infrared Spectroscopy in Astronomy" held in Garching

Scientific paper

10.1007/10995082_30

We describe the TEXES survey for mid-IR H2 pure rotational emission from young stars and report early successes. H2 emission is a potential tracer of warm gas in circumstellar disks. Three pure rotational lines are available from the ground: the J=3=>1, J=4=>2, and J=6=>4, transitions at 17.035 microns, 12.279 microns, and 8.025 microns, respectively. Using TEXES at the NASA IRTF 3m, we are midway through a survey of roughly 30 pre-main-sequence stars. To date, detected lines are all resolved, generally with FWHM<10 km/s. Preliminary analysis suggests the gas temperatures are between 400 and 800 K. From the work so far, we conclude that high spectral and spatial resolution are critical to the investigation of H2 in disks.

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