Subaru/HiCIAO HK s Imaging of LKHa 330: Multi-band Detection of the Gap and Spiral-like Structures
Subaru/HiCIAO HK s Imaging of LKHa 330: Multi-band Detection of the Gap and Spiral-like Structures
Uyama, Taichi;
Hashimoto, Jun;
Muto, Takayuki;
Akiyama, Eiji;
Dong, Ruobing;
de Leon, Jerome;
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; …
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.
- Publication:
-
The Astronomical Journal, Volume 156, Issue 2, article id. 63, 12 pp. (2018).
- Pub Date:
- August 2018
- DOI:
- 10.3847/1538-3881/aacbd1
- arXiv:
- arXiv:1804.05934