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Journal Articles The Astronomical Journal Year : 2016

## Spiral Structure and Differential Dust Size Distribution in the LKHα 330 Disk

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Eiji Akiyama
Jun Hashimoto
Hauyu Baobab Liu
• Function : Author
Jennifer I-Hsiu Li
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Ruobing Dong
Yasuhiro Hasegawa
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Thomas Henning
Michael L. Sitko
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Markus Janson
Markus Feldt
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John Wisniewski
Tomoyuki Kudo
Nobuhiko Kusakabe
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Takashi Tsukagoshi
Munetake Momose
Takayuki Muto
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Tetsuo Taki
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Masayuki Kuzuhara
Mayama Satoshi
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Michihiro Takami
Nagayoshi Ohashi
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• Function : Author
Jungmi Kwon
Christian Thalmann
Lyu Abe
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Wolfgang Brandner
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Timothy D. Brandt
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Joseph C. Carson
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Sebastian Egner
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Miwa Goto
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Olivier Guyon
Yutaka Hayano
Masahiko Hayashi
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Saeko S. Hayashi
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Klaus W. Hodapp
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Miki Ishii
• Function : Author
Masanori Iye
Gillian R. Knapp
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Ryo Kandori
Taro Matsuo
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Michael W. Mcelwain
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Shoken Miyama
Jun-Ichi Morino
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Amaya Moro-Martin
Tetsuo Nishimura
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Tae-Soo Pyo
Eugene Serabyn
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Takuya Suenaga
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Hiroshi Suto
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Ryuji Suzuki
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Yasuhiro H. Takahashi
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Naruhisa Takato
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Daigo Tomono
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Edwin L. Turner
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Makoto Watanabe
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Hideki Takami
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Tomonori Usuda
Motohide Tamura

#### Abstract

Dust trapping accelerates the coagulation of dust particles, and, thus, it represents an initial step toward the formation of planetesimals. We report H-band (1.6 μm) linear polarimetric observations and 0.87 mm interferometric continuum observations toward a transitional disk around LkHα 330. As a result, a pair of spiral arms were detected in the H-band emission, and an asymmetric (potentially arm-like) structure was detected in the 0.87 mm continuum emission. We discuss the origin of the spiral arm and the asymmetric structure and suggest that a massive unseen planet is the most plausible explanation. The possibility of dust trapping and grain growth causing the asymmetric structure was also investigated through the opacity index (β) by plotting the observed spectral energy distribution slope between 0.87 mm from our Submillimeter Array observation and 1.3 mm from literature. The results imply that grains are indistinguishable from interstellar medium-like dust in the east side (β =2.0+/- 0.5) but are much smaller in the west side β ={0.7}-0.4+0.5, indicating differential dust size distribution between the two sides of the disk. Combining the results of near-infrared and submillimeter observations, we conjecture that the spiral arms exist at the upper surface and an asymmetric structure resides in the disk interior. Future observations at centimeter wavelengths and differential polarization imaging in other bands (Y-K) with extreme AO imagers are required to understand how large dust grains form and to further explore the dust distribution in the disk.

#### Domains

Sciences of the Universe [physics]

### Dates and versions

insu-03691473 , version 1 (09-06-2022)

### Identifiers

• HAL Id : insu-03691473 , version 1
• ARXIV :
• BIBCODE :
• DOI :

### Cite

Eiji Akiyama, Jun Hashimoto, Hauyu Baobab Liu, Jennifer I-Hsiu Li, Michael Bonnefoy, et al.. Spiral Structure and Differential Dust Size Distribution in the LKHα 330 Disk. The Astronomical Journal, 2016, 152, ⟨10.3847/1538-3881/152/6/222⟩. ⟨insu-03691473⟩

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