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Abstract
We report the first detection of a gap and a ring in dust continuum emission from the protoplanetary disk around TW Hya, using the Atacama Large Millimeter/Submillimeter Array. The gap and ring are located at 25 and 41 AU from the central star, respectively, and are associated with the CO snowline at ~ 30AU. The gap width and depth are 15AU at the maximum and 23% at the minimum, respectively, regarding that the observations are limited to an angular resolution of ~ 15AU. In addition, we detect a decrement in CO line emission down to ~ 10AU, indicating freeze-out of gas-phase CO onto grain surfaces and possible subsequent surface reactions to form larger molecules. According to theoretical studies, the gap could be caused by gravitational interaction between the disk gas and a planet with a mass less than super-Neptune (2 Neptune mass), or result from destruction of large dust aggregates due to the sintering of CO ice.
Original language | English |
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Article number | L7 |
Number of pages | 7 |
Journal | Astrophysical Journal Letters |
Volume | 819 |
Issue number | 1 |
Early online date | 24 Feb 2016 |
DOIs | |
Publication status | Published - 01 Mar 2016 |
Keywords
- astro-ph.EP
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R1362APL: QUB STFC Consolidated Grant 2014-2017
Keenan, F. (PI), Fitzsimmons, A. (CoI), Janson, M. (CoI), Kotak, R. (CoI), Mathioudakis, M. (CoI), Maund, J. (CoI), Millar, T. (CoI), Ramsbottom, C. (CoI), Sim, S. (CoI), Smartt, S. (CoI) & Watson, C. (CoI)
12/12/2013 → 31/03/2018
Project: Research
Profiles
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Tom Millar
- School of Mathematics and Physics - Emeritus Professor
- Astrophysics Research Centre (ARC)
Person: Emeritus