Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 505, Issue 4, Pages 4821-4837Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stab1675
Keywords
astrochemistry; planet-disc interactions; protoplanetary discs
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Funding
- BEIS capital funding via STFC capital grants [ST/K000373/1, ST/R002363/1]
- STFC DiRAC Operations grant [ST/R001014/1]
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [681601]
- University of Leeds
- STFC
- UK Research and Innovation (UKRI) [ST/R000549/1, ST/T000287/1, MR/T040726/1]
- UKRI/EPSRC through a Stephen Hawking Fellowship [EP/T017287/1]
- EPSRC [EP/T017287/1] Funding Source: UKRI
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Circumstellar discs may become warped or broken into distinct planes due to misalignment with a stellar or planetary companion, impacting temperature and chemistry which in turn affects the possibility of planet formation. Observational evidence shows misaligned inner discs and warps caused by interactions with undetected companions, indicating potential planet formation.
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 tantalizing 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 degrees 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. Non-axisymmetric chemical abundances should be considered when interpreting molecular line maps of warped or shadowed protoplanetary discs.
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