A kinematic excess in the annular gap and gas-depleted cavity in the disc around HD 169142

H. Garg, C. Pinte, I. Hammond, R. Teague, T. Hilder, D. J. Price, J. Calcino, V. Christiaens, P. P. Poblete

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3 Citations (Scopus)


We present ALMA band 6 images of the 12CO, 13CO, and C18O J = 2-1 line emissions for the circumstellar disc around HD 169142, at ∼8 au spatial resolution. We resolve a central gas-depleted cavity, along with two independent near-symmetric ring-like structures in line emission: a well-defined inner gas ring [∼25 au] and a second relatively fainter and diffuse outer gas ring [∼65 au]. We identify a localized super-Keplerian feature or vertical flow with a magnitude of ∼75 ms-1 in the 12CO map. This feature has the shape of an arc that spans azimuthally across a position angle range of -60° to 45° and radially in between the B1[26au] and B2[59au] dust rings. Through reconstruction of the gas surface density profile, we find that the magnitude of the background perturbations by the pressure support and self-gravity terms are not significant enough to account for the kinematic excess. If of planetary origin, the relative depletion in the gas-density profile would suggest a 1 MJ planet. In contrast, the central cavity displays relatively smooth kinematics, suggesting either a low-mass companion and/or a binary orbit with a minimal vertical velocity component.

Original languageEnglish
Pages (from-to)5942-5958
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Publication statusPublished - 1 Dec 2022


  • accretion, accretion discs
  • circumstellar matter
  • stars: individual: HD169142
  • submillimetre: planetary systems

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