A Gap with a Deficit of Large Grains 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, T. J. Millar

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Abstract

We report 3 au resolution imaging observations of the protoplanetary disk aroundTW 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 shallowergaps (a few %) at 6, 28, and 44 au, as recently reported by Andrews et al. (2016). Thecentral hole with a radius of  3 au was also marginally resolved. The most remarkablefinding 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 anddecreases toward the disk center to ~0. The most prominent gap at 22 au could becaused by the gravitational interaction between the disk and an unseen planet with amass of ≲1.5 MNeptune 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 deficitof mm-sized grains within the gap due to dust filtration by a planet.
Original languageEnglish
Article numberL35
Number of pages6
JournalAstrophysical Journal Letters
Volume829
Issue number2
Early online date30 Sep 2016
DOIs
Publication statusPublished - 01 Oct 2016

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    Tsukagoshi, T., Nomura, H., Muto, T., Kawabe, R., Ishimoto, D., Kanagawa, K. D., Okuzumi, S., Ida, S., Walsh, C., & Millar, T. J. (2016). A Gap with a Deficit of Large Grains in the Protoplanetary Disk around TW Hya. Astrophysical Journal Letters, 829(2), [L35]. https://doi.org/doi:10.3847/2041-8205/829/2/L35