Tsukagoshi, T, Nomura, H, Muto, T et al. (7 more authors) (2016) A Gap with a Deficit of Large Grains in the Protoplanetary Disk around TW Hya. Astrophysical Journal Letters, 829 (2). L35. ISSN 2041-8205
Abstract
We report ∼3 au resolution imaging observations of the protoplanetary disk around TW Hya at 145 and 233 GHz with the Atacama Large Millimeter/submillimeter Array. Our observations revealed two deep gaps (∼25%-50%) at 22 and 37 au and shallower gaps (a few percent) at 6, 28, and 44 au, as recently reported by Andrews et al. The central hole with a radius of ∼3 au was also marginally resolved. The most remarkable finding is that the spectral index α(R) between bands 4 and 6 peaks at the 22 au gap. The derived power-law index of the dust opacity β(R) is ∼1.7 at the 22 au gap and decreases toward the disk center to ∼0. The most prominent gap at 22 au could be caused by the gravitational interaction between the disk and an unseen planet with a mass of ≲1.5 M Neptune, although other origins may be possible. The planet-induced gap is supported by the fact that β(R) is enhanced at the 22 au gap, indicating a deficit of ∼millimeter-sized grains within the gap due to dust filtration by a planet.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2016. The American Astronomical Society. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | protoplanetary disks; stars: individual (TW Hya) |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Astrophysics (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 02 Nov 2016 11:13 |
Last Modified: | 23 Jun 2023 22:16 |
Published Version: | https://doi.org/10.3847/2041-8205/829/2/L35 |
Status: | Published |
Publisher: | American Astronomical Society |
Identification Number: | 10.3847/2041-8205/829/2/L35 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:106861 |