hydrodynamics; planet-disc interactions; protoplanetary discs; circumstellar matter; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics
Abstract :
[en] Spiral arms in protoplanetary discs are thought to be linked to the presence of companions. We test the hypothesis that the double spiral arm morphology observed in the transition disc MWC 758 can be generated by an ≈10M<SUB>Jup</SUB> companion on an eccentric orbit internal to the spiral arms. Previous studies on MWC 758 have assumed an external companion. We compare simulated observations from three-dimensional hydrodynamics simulations of disc-companion interaction to scattered light, infrared and CO molecular line observations, taking into account observational biases. The inner companion hypothesis is found to explain the double spiral arms, as well as several additional features seen in MWC 758 - the arc in the north-west, substructures inside the spiral arms, the cavity in CO isotopologues, and the twist in the kinematics. Testable predictions include detection of fainter spiral structure, detection of a point source south-southeast of the primary, and proper motion of the spiral arms.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Calcino, Josh; University of Queensland, School of Mathematics and Physics
Christiaens, Valentin ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR) ; Monash University, School of Physics
Price, Daniel J.; Monash University, School of Physics
Pinte, Christophe; Monash University, School of Physics
Davis, Tamara M.; University of Queensland, School of Mathematics and Physics
van der Marel, Nienke; University of Victoria, Department of Physics and Astronomy
Cuello, Nicolás; Institute de Planetologie et d'Astrophysique de Grenoble
Language :
English
Title :
Are the spiral arms in the MWC 758 protoplanetary disc driven by a companion inside the cavity?