@article{79d21203814449b3b33e9a505cb0ba17,
title = "Binary-induced spiral arms inside the disc cavity of AB Aurigae",
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.",
keywords = "AB Aurigae, Circumstellar matter, Hydrodynamics – methods, Individual, Numerical, Protoplanetary discs, Stars",
author = "Poblete, {Pedro P.} and Josh Calcino and Nicol{\'a}s Cuello and Enrique Mac{\'i}as and {\'A}lvaro Ribas and Price, {Daniel J.} and Jorge Cuadra and Christophe Pinte",
note = "Funding Information: We thank the referee Ya-Wen Tang for useful comments and suggestions. We also thank Valentin Christiaens for discussions. PP and JCu acknowledge support from Iniciativa Cient{\'i}fica Milenio via the N{\'u}cleo Milenio de Formaci{\'o}n Planetaria. PP, NC, and JCu acknowledge support from CONICYT project Basal AFB-170002. JC acknowledges support from an Australian Government Research Training Program Scholarship. DJP and CP are grateful for Australian Research Council funding via DP180104235, FT130100034, and FT170100040. This project has received funding from the European Union{\textquoteright}s Horizon 2020 research and innovation programme under the Marie Sk{\l}odowska-Curie grant agreements N◦ 210021 and N◦ 823823 (DUSTBUSTERS). The Geryon2 cluster housed at the Centro de Astro-Ingenier{\'i}a UC was used for the calculations performed in this paper. The BASAL PFB-06 CATA, Anillo ACT-86, FONDEQUIP AIC-57, and QUIMAL 130008 provided funding for several improvements to the Geryon/Geryon2 cluster. Other calculations were also performed on the getafix cluster hosted by the School of Mathematics and Physics at the University of Queensland, and the OzSTAR national facility at Swinburne University of Technology. OzSTAR is funded by Swinburne University of Technology and the National Collaborative Research Infrastructure Strategy (NCRIS). This work has been partially supported by the Deutsche Forschungsgemeinschaft (grant LO 1715/2-1, within Research Unit FOR 2285 {\textquoteleft}Debris Disks in Planetary System{\textquoteright}. Publisher Copyright: {\textcopyright} 2020 The Author(s)",
year = "2020",
doi = "10.1093/MNRAS/STAA1655",
language = "English",
volume = "496",
pages = "2362--2371",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "2",
}