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Chemical signatures of a warped protoplanetary disc

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journal contribution
posted on 05.08.2021, 13:33 by Alison K Young, Richard Alexander, Catherine Walsh, Rebecca Nealon, Alice Booth, Christophe Pinte
Circumstellar discs may become warped or broken into distinct planes if there is a stellar or planetary companion with an orbit that is misaligned with respect to the disc. There is mounting observational evidence for protoplanetary discs with misaligned inner discs and warps that may be caused by such interactions with a previously undetected companion, giving us a tantalising indication of possible planets forming there. Hydrodynamical and radiative transfer models indicate that the temperature varies azimuthally in warped discs due to the variable angle at which the disc surface faces the star and this impacts the disc chemistry. We perform chemical modelling based on a hydrodynamical model of a protoplanetary disc with an embedded planet orbiting at a 12○ inclination to the disc. Even for this small misalignment, abundances of species including CO and HCO+ vary azimuthally and this results in detectable azimuthal variations in submillimetre line emission. Azimuthal variations in line emission may therefore indicate the presence of an unseen embedded companion. Nonaxisymmetric chemical abundances should be considered when interpreting molecular line maps of warped or shadowed protoplanetary discs.

History

Citation

Monthly Notices of the Royal Astronomical Society, Volume 505, Issue 4, August 2021, Pages 4821–4837, https://doi.org/10.1093/mnras/stab1675

Author affiliation

Department of Physics and Astronomy

Version

AM (Accepted Manuscript)

Published in

Monthly Notices of the Royal Astronomical Society

Volume

505

Issue

4

Pagination

4821 - 4837

Publisher

Oxford University Press (OUP)

issn

0035-8711

eissn

1365-2966

Acceptance date

01/06/2021

Copyright date

2021

Available date

05/08/2021

Language

en

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