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  Temperature, Mass, and Turbulence: A Spatially Resolved Multiband Non-LTE Analysis of CS in TW Hya

Teague, R., Henning, T., Guilloteau, S., Bergin, E. A., Semenov, D., Dutrey, A., et al. (2018). Temperature, Mass, and Turbulence: A Spatially Resolved Multiband Non-LTE Analysis of CS in TW Hya. The Astrophysical Journal, 864.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CABC-4 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CABD-3
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2018ApJ...864..133T (Any fulltext)
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 Creators:
Teague, Richard1, Author
Henning, Thomas1, Author
Guilloteau, Stéphane1, Author
Bergin, Edwin A.1, Author
Semenov, Dmitry1, Author
Dutrey, Anne1, Author
Flock, Mario1, Author
Gorti, Uma1, Author
Birnstiel, Tilman1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: astrochemistry ISM: molecules protoplanetary disks techniques: interferometric Astrophysics - Earth and Planetary Astrophysics
 Abstract: Observations of multiple rotational transitions from a single molecule allow for unparalleled constraints on the physical conditions of the emitting region. We present an analysis of CS in TW Hya using the J = 7-6, 5-4 and 3-2 transitions imaged at ̃0.″5 spatial resolution, resulting in a temperature and column density profile of the CS emission region extending out to 230 au, far beyond previous measurements. In addition, the 15 kHz resolution of the observations and the ability to directly estimate the temperature of the CS emitting gas, allow for one of the most sensitive searches for turbulent broadening in a disk to date. Limits of v turb ≲ 0.1c s can be placed across the entire radius of the disk. We are able to place strict limits of the local H2 density due to the collisional excitations of the observed transitions. From these we find that a minimum disk mass of 3 × 10-4 M Sun is required to be consistent with the CS excitation conditions and can uniquely constrain the gas surface density profile in the outer disk.

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 Dates: 2018
 Publication Status: Issued
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Title: The Astrophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 864 Sequence Number: - Start / End Page: - Identifier: -