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Uyama, Taichi; Hashimoto, Jun; Muto, Takayuki; Akiyama, Eiji; Dong, Ruobing; Leon, Jerome de; Sakon, Itsuki; Kudo, Tomoyuki; Kusakabe, Nobuhiko; Kuzuhara, Masayuki; Bonnefoy, Mickael; Abe, Lyu; Brandner, Wolfgang; Brandt, Timothy D.; Carson, Joseph C.; Currie, Thayne; Egner, Sebastian; Feldt, Markus; Fung, Jeffrey; Goto, Miwa; Grady, Carol A.; Guyon, Olivier; Hayano, Yutaka; Hayashi, Masahiko; Hayashi, Saeko S.; Henning, Thomas; Hodapp, Klaus W.; Ishii, Miki; Iye, Masanori; Janson, Markus; Kandori, Ryo; Knapp, Gillian R.; Kwon, Jungmi; Matsuo, Taro; Mayama, Satoshi; Mcelwain, Michael W.; Miyama, Shoken; Morino, Jun-Ichi; Moro-Martin, Amaya; Nishimura, Tetsuo; Pyo, Tae-Soo; Serabyn, Eugene; Sitko, Michael L.; Suenaga, Takuya; Suto, Hiroshi; Suzuki, Ryuji; Takahashi, Yasuhiro H.; Takami, Michihiro; Takato, Naruhisa; Terada, Hiroshi; Thalmann, Christian; Turner, Edwin L.; Watanabe, Makoto; Wisniewski, John; Yamada, Toru; Yang, Yi; Takami, Hideki; Usuda, Tomonori; Tamura, Motohide
The Astronomical journal, 08/2018, Letnik: 156, Številka: 2Journal Article
Abstract We present H - and K s -bands observations of the LkH α 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.
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