We present H- and Ks-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◦ are 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 semi-major 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 the presence of an inner object that casts a directional shadow onto the disk.
|Original language||English (US)|
|State||Published - Apr 16 2018|
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