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Rings of C2H in the Molecular Disks Orbiting TW Hya and V4046 Sgr

Published online by Cambridge University Press:  27 January 2016

J. H. Kastner ,
C. Qi ,
U. Gorti ,
P. Hily-Blant ,
K. Oberg ,
T. Forveille ,
S. Andrews  and
D. Wilner
J. H. Kastner
Affiliation:
Lab. for Multiwavelength Astrophysics, Rochester Institute of Technology; jhk@cis.rit.edu
C. Qi
Affiliation:
Harvard-Smithsonian Center for Astrophysics
U. Gorti
Affiliation:
SETI Institute & NASA Ames Research Center
P. Hily-Blant
Affiliation:
Université Grenoble Alpes & Institut de Planétologie et d'Astrophysique de Grenoble
K. Oberg
Affiliation:
Harvard-Smithsonian Center for Astrophysics
T. Forveille
Affiliation:
Université Grenoble Alpes & Institut de Planétologie et d'Astrophysique de Grenoble
S. Andrews
Affiliation:
Harvard-Smithsonian Center for Astrophysics
D. Wilner
Affiliation:
Harvard-Smithsonian Center for Astrophysics
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Abstract

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We have used the Submillimeter Array (SMA) to image, at ~1″ resolution, C2H(3−2) emission from the molecule-rich circumstellar disks orbiting the nearby, classical T Tauri star systems TW Hya and V4046 Sgr. The SMA imaging reveals that the C2H emission exhibits a ring-like morphology within each disk; the radius of the inner hole of the C2H ring within the V4046 Sgr disk (~70 AU) is somewhat larger than than of its counterpart within the TW Hya disk (~45 AU). We suggest that, in each case, the C2H emission likely traces irradiation of the tenuous surface layers of the outer disks by high-energy photons from the central stars.

Keywords

protoplanetary disksstars: individual (TW Hya, V4046 Sgr)stars: pre-main sequence
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S314: Young Stars & Planets Near the Sun , November 2015 , pp. 193 - 194
Copyright
Copyright © International Astronomical Union 2016 

References

Kastner, J. H., Hily-Blant, P., Rodriguez, D. R., Punzi, K., & Forveille, T. 2014, ApJ, 793, 55CrossRefGoogle Scholar
Kastner, J. H., Qi, C., Gorti, U., et al. 2015, ApJ, in press (arXiv:1504.05980; K15)Google Scholar
Qi, C., Öberg, K. I., Wilner, D. J., et al. 2013, Science, 341, 630Google Scholar
Rosenfeld, K. A., Andrews, S. M., Wilner, D. J., & Stempels, H. C. 2012, ApJ, 759, 119Google Scholar