Subaru/HiCIAO HK _s Imaging of LKHa 330: Multi-band Detection of the Gap and Spiral-like Structures

Taichi Uyama , Jun Hashimoto , Takayuki Muto , Eiji Akiyama , Ruobing Dong , Jerome de Leon , Itsuki Sakon , Tomoyuki Kudo , Nobuhiko Kusakabe , Masayuki Kuzuhara , Mickael Bonnefoy (1) , Lyu Abe , Wolfgang Brandner , Timothy D. Brandt , Joseph C. Carson , Thayne Currie , Sebastian Egner , Markus Feldt , Jeffrey Fung , Miwa Goto , Carol A. Grady , Olivier Guyon , Yutaka Hayano , Masahiko Hayashi , Saeko S. Hayashi , Thomas Henning , Klaus W. Hodapp , Miki Ishii , Masanori Iye , Markus Janson , Ryo Kandori , Gillian R. Knapp , Jungmi Kwon , Taro Matsuo , Satoshi Mayama , Michael W. Mcelwain , Shoken Miyama , Jun-Ichi Morino , Amaya Moro-Martin , Tetsuo Nishimura , Tae-Soo Pyo , Eugene Serabyn , Michael L. Sitko , Takuya Suenaga , Hiroshi Suto , Ryuji Suzuki , Yasuhiro H. Takahashi , Michihiro Takami , Naruhisa Takato , Hiroshi Terada , Christian Thalmann , Edwin L. Turner , Makoto Watanabe , John Wisniewski , Toru Yamada , Yi Yang , Hideki Takami , Tomonori Usuda , Motohide Tamura

1 IPAG - Institut de Planétologie et d'Astrophysique de Grenoble

We present H- and K _s-bands observations of the LkHα 330 disk with a multi-band detection of the large gap and spiral-like structures. The morphology of the outer disk (r ∼ 0.″3) at PA = 0°-45° and PA° = 180-290° is likely density wave-induced spirals, and comparison between our observational results and simulations suggests a planet formation. We have also investigated the azimuthal profiles at the ring and the outer-disk regions as well as radial profiles in the directions of the spiral-like structures and semimajor axis. Azimuthal analysis shows a large variety in wavelength and implies that the disk has non-axisymmetric dust distributions. The radial profiles in the major-axis direction (PA = 271°) suggest that the outer region (r ≥ 0.″25) may be influenced by shadows of the inner region of the disk. The spiral-like directions (PA = 10° and 230°) show different radial profiles, which suggests that the surfaces of the spiral-like structures are highly flared and/or have different dust properties. Finally, a color map of the disk shows a lack of an outer eastern region in the H-band disk, which may hint at the presence of an inner object that casts a directional shadow onto the disk.

Keywords: planet–disk interactions; polarization; protoplanetary disks; Astrophysics - Earth and Planetary Astrophysics

Domains: Sciences of the Universe [physics]

Taichi Uyama, Jun Hashimoto, Takayuki Muto, Eiji Akiyama, Ruobing Dong, et al.. Subaru/HiCIAO HK _s Imaging of LKHa 330: Multi-band Detection of the Gap and Spiral-like Structures. The Astronomical Journal, 2018, 156, ⟨10.3847/1538-3881/aacbd1⟩. ⟨insu-03693545⟩