The Origin of the Doppler Flip in HD 100546: A Large-scale Spiral Arm Generated by an Inner Binary Companion

Brodie J. Norfolk , Christophe Pinte (1) , Josh Calcino , Iain Hammond , Nienke van der Marel , Daniel J. Price , Sarah T. Maddison , Valentin Christiaens , Jean-François Gonzalez (2) , Dori Blakely , Giovanni Rosotti , Christian Ginski

1 IPAG - Institut de Planétologie et d'Astrophysique de Grenoble
2 CRAL - Centre de Recherche Astrophysique de Lyon

Companions at subarcsecond separation from young stars are difficult to image. However, their presence can be inferred from the perturbations they create in the dust and gas of protoplanetary disks. Here we present a new interpretation of SPHERE polarized observations that reveal the previously detected inner spiral in the disk of HD 100546. The spiral coincides with a newly detected ¹²CO inner spiral and the previously reported CO emission Doppler flip, which has been interpreted as the signature of an embedded protoplanet. Comparisons with hydrodynamical models indicate that this Doppler flip is instead the kinematic counterpart of the spiral, which is likely generated by an inner companion inside the disk cavity.

Mots clés: Protoplanetary disks; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics

Domaines: Planète et Univers [physics]

Brodie J. Norfolk, Christophe Pinte, Josh Calcino, Iain Hammond, Nienke van der Marel, et al.. The Origin of the Doppler Flip in HD 100546: A Large-scale Spiral Arm Generated by an Inner Binary Companion. The Astrophysical journal letters, 2022, 936, ⟨10.3847/2041-8213/ac85ed⟩. ⟨insu-03777331⟩