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Gap opening by planets in discs with magnetised winds

Published online by Cambridge University Press:  16 August 2023

Vardan Elbakyan Open the ORCID record for Vardan Elbakyan [Opens in a new window] ,
Yinhao Wu ,
Sergei Nayakshin  and
Giovanni Rosotti
Vardan Elbakyan
Affiliation:
School of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK
Yinhao Wu
Affiliation:
School of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK
Sergei Nayakshin
Affiliation:
School of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK
Giovanni Rosotti
Affiliation:
School of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK
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Abstract

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Planets open deep gaps in protoplanetary discs when their mass exceeds a gap opening mass, Mgap. We use one- and two-dimensional simulations to study planet gap opening in discs with angular momentum transport powered by MHD disc winds. We parameterise the efficiency of the MHD disc wind angular momentum transport through a dimensionless parameter αdw, which is an analogue to the turbulent viscosity αv. We find that magnetised winds are much less efficient in counteracting planet tidal torques than turbulence is. For discs with astrophysically realistic values of αdw, Mgap is always determined by the residual disc turbulence, and is a factor of a few to ten smaller than usually obtained for viscous discs. We introduce a gap opening criterion applicable for any values of αv and αdw that may be useful for planet formation population synthesis.

Keywords

planetary systems: formationplanetary systems: protoplanetary disksplanets and satellites: formation
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 17 , Symposium S370: Winds of Stars and Exoplanets , August 2021 , pp. 194 - 195
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

References

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