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Article overview
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Multiple gaps with large grain deficit in the protoplanetary disk around TW Hya | Takashi Tsukagoshi
; Hideko Nomura
; Takayuki Muto
; Ryohei Kawabe
; Daiki Ishimoto
; Kazuhiro D. Kanagawa
; Satoshi Okuzumi
; Shigeru Ida
; Catherine Walsh
; Tom J. Millar
; | Date: |
1 May 2016 | Abstract: | We report $sim$3 au resolution imaging observations of the protoplanetary
disk around TW Hya at 138 and 230 GHz with the Atacama Large
Millimeter/Submillimeter Array. Our observations revealed two deep gaps
($sim$25--50 %) at 22 and 37 au and shallower gaps (a few %) at 6, 28, and 44
au, as recently reported by Andrews et al. (2016). The central hole with a
radius of $sim3$ au was also marginally resolved. The most remarkable finding
is that the power-law index of the dust opacity $eta$, derived from the
spectral index $alpha$ between bands 4 and 6, peaks at the 22 au gap with
$etasim1.7$ and decreases toward the disk center to $etasim0$. Our model
fitting suggests that the overall disk structure can be reproduced with the
inner hole and the gaps at 22 and 37 au. 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 $lesssim$1.5 $M_mathrm{Neptune}$ although other origins
may be possible. The planet-induced gap is supported by the fact that $eta$
is enhanced at the 22 au gap, indicating a deficit of $sim$mm-sized grains
within the gap due to dust filtration by a planet. Alternatively, the
destruction of large dust aggregates due to the sintering of major volatiles
might cause the multiple ring structure. We also find weak sinusoidal patterns
with wavelengths of 5--10 au, which may be related to dynamical instabilities
within the disk. | Source: | arXiv, 1605.0289 | Services: | Forum | Review | PDF | Favorites |
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