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Journal Article

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

MPS-Authors

Teague,  Richard
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Henning,  Thomas
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Guilloteau,  Stéphane
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bergin,  Edwin A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Semenov,  Dmitry
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Dutrey,  Anne
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Flock,  Mario
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gorti,  Uma
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Birnstiel,  Tilman
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2018ApJ...864..133T
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Citation

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.


Cite as: https://hdl.handle.net/21.11116/0000-0005-CABC-4
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.