Recent observations show that rings and gaps are ubiquitous in protoplanetary discs. These features are often interpreted as being due to the presence of planets; however, the effect of planetary migration on the observed morphology has not been investigated hitherto. In this work, we 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 synthesizing ALMA continuum observations at 850 mu m and 3 mm. We identify three possible morphologies for a migrating planet: a slowly migrating planet is associated with a single ring outside the planet's orbit, a rapidly migrating planet is associated with a single ring inside the planet's orbit while a planet migrating at intermediate speed generates one ring on each side of the planet's orbit. We 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. The signature of migration is that the outer ring has a lower spectral index, due to larger dust grains being trapped there. Of the recent ALMA observations revealing protoplanetary discs with multiple rings and gaps, we suggest that Elias 24 is the best candidate for a planet migrating in the intermediate speed regime.

Revealing signatures of planets migrating in protoplanetary discs with ALMA multiwavelength observations / P. Nazari, R. A Booth, C. J Clarke, G. Rosotti, M. Tazzari, A. Juhasz, F. Meru. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - 485:4(2019), pp. 5914-5923. [10.1093/mnras/stz836]

Revealing signatures of planets migrating in protoplanetary discs with ALMA multiwavelength observations

G. Rosotti;
2019

Abstract

Recent observations show that rings and gaps are ubiquitous in protoplanetary discs. These features are often interpreted as being due to the presence of planets; however, the effect of planetary migration on the observed morphology has not been investigated hitherto. In this work, we 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 synthesizing ALMA continuum observations at 850 mu m and 3 mm. We identify three possible morphologies for a migrating planet: a slowly migrating planet is associated with a single ring outside the planet's orbit, a rapidly migrating planet is associated with a single ring inside the planet's orbit while a planet migrating at intermediate speed generates one ring on each side of the planet's orbit. We 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. The signature of migration is that the outer ring has a lower spectral index, due to larger dust grains being trapped there. Of the recent ALMA observations revealing protoplanetary discs with multiple rings and gaps, we suggest that Elias 24 is the best candidate for a planet migrating in the intermediate speed regime.
hydrodynamics; techniques: interferometric; planet-disc interactions; protoplanetary discs; submillimetre: planetary systems
Settore FIS/05 - Astronomia e Astrofisica
   Hydrodynamical simulations of protoplanetary discs in the era of ALMA imaging
   DISCSIM
   European Commission
   SEVENTH FRAMEWORK PROGRAMME
   341137
2019
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/950866
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