Binary-induced spiral arms inside the disc cavity of AB Aurigae

Pedro P. Poblete, Josh Calcino, Nicolás Cuello, Enrique Macías, Álvaro Ribas, Daniel J. Price, Jorge Cuadra, Christophe Pinte

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17 Citations (Scopus)

Abstract

In this work we demonstrate that the inner spiral structure observed in AB Aurigae can be created by a binary star orbiting inside the dust cavity. We find that a companion with a mass-ratio of 0.25, semimajor axis of 40 au, eccentricity of 0.5, and inclination of 90 produces gaseous spirals closely matching the ones observed in 12CO (2-1) line emission. Based on dust dynamics in circumbinary discs (Poblete, Cuello & Cuadra 2019), we constrain the inclination of the binary with respect to the circumbinary disc to range between 60 and 90. We predict that the stellar companion is located roughly 0.18 arcsec from the central star towards the east-southeast, above the plane of the disc. Should this companion be detected in the near future, our model indicates that it should be moving away from the primary star at a rate of 6 mas yr−1 on the plane of the sky. Since our companion is inclined, we also predict that the spiral structure will appear to change with time, and not simply corotate with the companion.

Original languageEnglish
Pages (from-to)2362-2371
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume496
Issue number2
DOIs
Publication statusPublished - Aug 2020

Keywords

  • AB Aurigae
  • Circumstellar matter
  • Hydrodynamics – methods
  • Individual
  • Numerical
  • Protoplanetary discs
  • Stars

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