Subaru/HiCIAO HK s Imaging of LKHa 330: Multi-band Detection of the Gap and Spiral-like Structures
Henning, Thomas; Terada, Hiroshi; Usuda, Tomonori; Currie, Thayne; Dong, Ruobing; Kwon, Jungmi; Pyo, Tae-Soo; Tamura, Motohide; Takami, Michihiro; Hayashi, Masahiko; Uyama, Taichi; Wisniewski, John; Sakon, Itsuki; Hashimoto, Jun; Kudo, Tomoyuki; de Leon, Jerome; Muto, Takayuki; Abe, Lyu; Sitko, Michael L.; Brandner, Wolfgang; Kuzuhara, Masayuki; Grady, Carol A.; Yamada, Toru; Brandt, Timothy D.; Yang, Yi; Mayama, Satoshi; Kusakabe, Nobuhiko; Hayashi, Saeko S.; Akiyama, Eiji; Carson, Joseph C.; Feldt, Markus; Goto, Miwa; Guyon, Olivier; Hayano, Yutaka; Hodapp, Klaus W.; Ishii, Miki; Iye, Masanori; Janson, Markus; Kandori, Ryo; Knapp, Gillian R.; Matsuo, Taro; Miyama, Shoken; Morino, Jun-Ichi; Moro-Martin, Amaya; Nishimura, Tetsuo; Serabyn, Eugene; Suto, Hiroshi; Suzuki, Ryuji; Takato, Naruhisa; Thalmann, Christian; Turner, Edwin L.; Watanabe, Makoto; Takami, Hideki; Bonnefoy, Mickael; Fung, Jeffrey; Suenaga, Takuya; Takahashi, Yasuhiro H.; Mcelwain, Michael W.; Egner, Sebastian
Japan, United States, France, Germany, Spain, Taiwan, Switzerland
Abstract
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.