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Journal Articles The Astronomical Journal Year : 2020

Near-infrared Imaging of a Spiral in the CQ Tau Disk

Taichi Uyama
Takayuki Muto
  • Function : Author
Dimitri Mawet
Valentin Christiaens
Jun Hashimoto
Tomoyuki Kudo
Masayuki Kuzuhara
Garreth Ruane
  • Function : Author
Charles Beichman
Olivier Absil
Eiji Akiyama
Jaehan Bae
Michael Bottom
  • Function : Author
Elodie Choquet
Thayne Currie
Ruobing Dong
Katherine B. Follette
  • Function : Author
Misato Fukagawa
Greta Guidi
  • Function : Author
Jungmi Kwon
Satoshi Mayama
Tiffany Meshkat
  • Function : Author
Maddalena Reggiani
  • Function : Author
Luca Ricci
  • Function : Author
Eugene Serabyn
  • Function : Author
Motohide Tamura
Leonardo Testi
Nicole Wallack
  • Function : Author
Jonathan Williams
Zhaohuan Zhu
  • Function : Author


We present L'-band Keck/NIRC2 imaging and H-band Subaru/AO188+HiCIAO polarimetric observations of the CQ Tau disk with a new spiral arm. Apart from the spiral feature, our observations could not detect any companion candidates. We traced the spiral feature from the r2-scaled High-Contrast Coronographic Imager for Adaptive Optics (HiCIAO) polarimetric intensity image and the fitted result is used for forward modeling to reproduce the ADI-reduced NIRC2 image. We estimated the original surface brightness after throughput correction in the L' band to be ∼126 mJy arcsec-2 at most. We suggest that the grain temperature of the spiral may be heated up to ∼200 K in order to explain both of the H- and L'-band results. The H-band emission at the location of the spiral originates from the scattering from the disk surface while both scattering and thermal emission may contribute to the L'-band emission. If the central star is only the light source of scattered light, the spiral emission at the L' band should be thermal emission. If an inner disk also acts as the light source, the scattered light and the thermal emission may equally contribute to the L'-band spiral structure.

Dates and versions

insu-03667125 , version 1 (13-05-2022)



Taichi Uyama, Takayuki Muto, Dimitri Mawet, Valentin Christiaens, Jun Hashimoto, et al.. Near-infrared Imaging of a Spiral in the CQ Tau Disk. The Astronomical Journal, 2020, 159, ⟨10.3847/1538-3881/ab7006⟩. ⟨insu-03667125⟩
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