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

Dates and versions

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

Identifiers

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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