Young Stars in Taurus: A search for gas tracers in protoplanetary disks with Spitzer IRS spectra.

Details Young Stars in Taurus: A search for gas tracers in protoplanetary disks with Spitzer IRS spectra. Young Stars in Taurus: A search for gas tracers in protoplanetary disks with Spitzer IRS spectra.

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sf2a.conf..305b&link_type=abstract

SF2A-2009: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics, held 29 June - 4 July 2009 in

Astronomy and Astrophysics

Astrophysics

Scientific paper

In order to understand the structure and evolution of proto-planetary disks is fundamental to study the gas, which represents the ˜99% of their mass. But its properties are not yet well constrained because its detection is a difficult task. Dust, although a minor constituent of disks dominates the opacity, therefore it is much easy to observe. Our current knowledge of disks is largely based on the study of the emission from the dust. In the last few years, several detections of gas tracers in the mid-infrared have been reported, in particular [Ne II] (12.81 μm) whose origin is somehow controversial.
We have started a search for gas tracers in a sample of low-mass pre-main sequence stars in the Taurus Molecular Cloud. This study is based on archival observations of young stellar objects done by the Spitzer Space Telescope with the IRS high-resolution module spectrometer (R=600). Our sample contains 70 objects, we have detected emission lines from ionized gas and molecular rotational lines in 23 of them. We have fitted the line profiles and obtained line fluxes, with the aim to look for correlations with stellar parameters such as L_{X} or mass accretion rate in order to test the mechanism at the origin of the lines (irradiation, shocks, thermal, etc.). We present a review on our current understanding of gas in young stars and present the results from our study of the Taurus Molecular Cloud through Spitzer spectra.

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