The protoplanetary disc around HD 169142: Circumstellar or circumbinary?

P. P. Poblete, N. Cuello, S. Perez, S. Marino, J. Calcino, E. MacÍas, A. Ribas, A. Zurlo, J. Cuadra, M. Montesinos, S. Zúñiga-Fernández, A. Bayo, C. Pinte, F. Menard, D. J. Price

Research output: Contribution to journalArticlepeer-review

Abstract

Stellar binaries represent a substantial fraction of stellar systems, especially among young stellar objects. Accordingly, binaries play an important role in setting the architecture of a large number of protoplanetary discs. Binaries in coplanar and polar orientations with respect to the circumbinary disc are stable configurations and could induce non-axisymmetric structures in the dust and gas distributions. In this work, we suggest that the structures shown in the central region of the protoplanetary disc HD 169142 are produced by the presence of an inner stellar binary and a circumbinary (P-type) planet. We find that a companion with a mass ratio of 0.1, semimajor axis of 9.9 au, eccentricity of 0.2, and inclination of 90°, together with a 2 MJ coplanar planet on a circular orbit at 45 au reproduce the structures at the innermost ring observed at 1.3 mm and the shape of spiral features in scattered light observations. The model predicts changes in the disc's dust structure, and star's astrometric parameters, which would allow testing its veracity by monitoring this system over the next 20 yr.

Original languageEnglish
Pages (from-to)205-215
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Volume510
Issue number1
DOIs
StatePublished - 1 Feb 2022
Externally publishedYes

Keywords

  • binaries: close
  • hydrodynamics
  • methods: numerical
  • planet-disc interactions
  • protoplanetary discs
  • stars: individual: HD 169142

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