Evidence for Non-zero Turbulence in the Protoplanetary disc around IM Lup
arxiv(2024)
摘要
The amount of turbulence in protoplanetary discs around young stars is
critical for determining the efficiency, timeline, and outcomes of planet
formation. It is also difficult to measure. Observations are still limited, but
direct measurements of the non-thermal, turbulent gas motion are possible with
the Atacama Large Millimeter/submillimeter Array (ALMA). Using
CO(2-1)/^13CO(2-1)/C^18O(2-1) ALMA observations of the disc around IM
Lup at 0.4" ( 60 au) resolution we find evidence of significant turbulence, at
the level of δ v_ turb=(0.18-0.30)c_s. This result is robust
against systematic uncertainties (e.g., amplitude flux calibration, midplane
gas temperature, disc self-gravity). We find that gravito-turbulence as the
source of the gas motion is unlikely based on the lack of an imprint on the
rotation curve from a massive disc, while magneto-rotational instabilities and
hydrodynamic instabilities are still possible, depending on the unknown
magnetic field strength and the cooling timescale in the outer disc.
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