1. What have the authors contributed in "Revealing signatures of planets migrating in protoplanetary discs with alma multi-wavelength observations" ?
In this work the authors investigate whether multiwavelength mm/submm observations can detect signatures of planet migration, using 2D dusty hydrodynamic simulations to model the structures generated by migrating planets and synthesising ALMA continuum observations at 850μm and 3 mm.. The authors argue that multiwavelength data can distinguish multiple rings produced by a migrating planet from other scenarios for creating multiple rings, such as multiple planets or discs with low viscosity.. Of the recent ALMA observations revealing protoplanetary discs with multiple rings and gaps, the authors suggest that Elias 24 is the best candidate for a planet migrating in the intermediate speed regime.
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2. What are the future works in "Revealing signatures of planets migrating in protoplanetary discs with alma multi-wavelength observations" ?
In this work the authors studied the possibility of observing the signature of a migrating planet, as predicted in Meru et al. ( 2019 ).. The authors conduct 2D dusty hydrodynamic simulations of planets migrating in protoplanetary discs and produce synthetic ALMA continuum images at 850µm and 3mm for a 30M planet.. The authors find that the brightness profiles of the dust continuum along with the spectral indices can constrain whether a planet is migrating, based upon three di↵erent morphologies for the brightness profiles.. The authors argue that these morphologies can be used to constrain the planet migration speed, if the radial drift velocity of the dust can be estimated, for example via the spectral index of the millimetre emission.
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3. What is the way to determine whether a planet is migrating?
The authors find that the brightness profiles of the dust continuum along with the spectral indices can constrain whether a planet is migrating, based upon three di↵erent morphologies for the brightness profiles.
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4. Why did Meru et al. (2019) identify that planet migration can significantly change?
Meru et al. (2019) identified that planet migration can significantly change the morphology of dust emission because it is possible for a planet to migrate faster than the dust.
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