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

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posted on 2022-10-04, 09:01 authored by Brodie J Norfolk, Christophe Pinte, Josh Calcino, Iain Hammond, Nienke van der Marel, Daniel J Price, Sarah T Maddison, Valentin Christiaens, Jean-Francois Gonzalez, Dori Blakely, Giovanni Rosotti, Christian Ginski

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.

History

Author affiliation

School of Physics and Astronomy, University of Leicester

Version

  • VoR (Version of Record)

Published in

Astrophysical Journal Letters

Volume

936

Issue

1

Publisher

IOP Publishing Ltd

issn

2041-8205

eissn

2041-8213

Copyright date

2022

Available date

2022-10-04

Language

English

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