External or internal companion exciting the spiral arms in CQ Tau? - Archive ouverte HAL Access content directly
Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2022

External or internal companion exciting the spiral arms in CQ Tau?

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Iain Hammond
  • Function : Author
Valentin Christiaens
  • Function : Author
Daniel J. Price
  • Function : Author
Maria Giulia Ubeira-Gabellini
  • Function : Author
Jennifer Baird
  • Function : Author
Josh Calcino
  • Function : Author
Giuseppe Lodato
  • Function : Author
Leonardo Testi
  • Function : Author
Claudia Toci
  • Function : Author
Davide Fedele
  • Function : Author

Abstract

We present new high-contrast images in near-infrared wavelengths (λc = 1.04, 1.24, 1.62, 2.18, and 3.78 μm) of the young variable star CQ Tau, aiming to constrain the presence of companions in the protoplanetary disc. We reached a Ks-band contrast of 14 mag with SPHERE/IRDIS at separations greater than 0${_{.}^{\prime\prime}}$4 from the star. Our mass sensitivity curve rules out giant planets above 4 MJup immediately outside the spiral arms at ~60 au and above 2-3 MJup beyond 100 au to 5σ confidence assuming hot-start models. We do, however, detect four spiral arms, a double-arc and evidence for shadows in scattered light cast by a misaligned inner disc. Our observations may be explained by an unseen close-in companion on an inclined and eccentric orbit. Such a hypothesis would also account for the disc CO cavity and disturbed kinematics.

Dates and versions

insu-03860276 , version 1 (18-11-2022)

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Iain Hammond, Valentin Christiaens, Daniel J. Price, Maria Giulia Ubeira-Gabellini, Jennifer Baird, et al.. External or internal companion exciting the spiral arms in CQ Tau?. Monthly Notices of the Royal Astronomical Society, 2022, 515, pp.6109-6121. ⟨10.1093/mnras/stac2119⟩. ⟨insu-03860276⟩
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