Subaru/HiCIAO HKs Imaging of LKHa 330: Multi-band Detection of the Gap and Spiral-like Structures
Leon, Jerome de
Brandt, Timothy D.
Carson, Joseph C.
Grady, Carol A.
Hayashi, Saeko S.
Hodapp, Klaus W.
Knapp, Gillian R.
McElwain, Michael W.
Sitko, Michael L.
Takahashi, Yasuhiro H.
Turner, Edwin L.
AffiliationUniv Arizona, Steward Observ
MetadataShow full item record
PublisherIOP PUBLISHING LTD
CitationTaichi Uyama et al 2018 AJ 156 63
Rights© 2018. The American Astronomical Society. All rights reserved.
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AbstractWe present H- and K-s-bands observations of the LkH alpha 330 disk with a multi-band detection of the large gap and spiral-like structures. The morphology of the outer disk (r similar to 0."3) at PA = 0 degrees-45 degrees and PA degrees = 180-290 degrees 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 degrees) 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 degrees and 230 degrees) 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.
VersionFinal published version
SponsorsJSPS KAKENHI [JP17J00934, JP15H02063, JP258826, JP17K14258, JP26800106, JP15H02074, JP17H01103]